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##include <iostream>
#include <unistd.h>
#include <sys/wait.h>
#include <limits.h>
#include <dirent.h>
#include <sstream>
#include <cstring>
#include <vector>
#include <boost/bind.hpp>
 
using namespace std;
 
#define PATH_MAX 4096
 
char *curr_dir = (char *) "/usr/bin";
/*
string comm;
string argum;
int splitting(string l) {
    string arr[3];
    int i = 0;
    stringstream ssin(l);
    while (ssin.good() && i < 3) {
        ssin >> arr[i];
        ++i;
        if(i == 3){
            printf("ERROR : TU DAUN! TAK NE MOZNA PYSATY.");
            return -1;
        }
    }
    comm = arr[0];
    argum = arr[1];
    cout << comm << endl;
    cout << argum;
    return 0;
}*/
vector<char*> vectorOfPath;
string command;
string args;
void splitString( string line){
    int i = 0;
    while(i != sizeof(line)){
        if(line[i] == ' '){
            command = line.substr(0,i);
            args = line.substr(i+1, sizeof(line));
            break;
        }else{
            command = line;
        }
        i++;
    }}
 
int cd(char** argv){
    if (argv[1] == NULL)
    {
        chdir ("/");
        curr_dir = get_current_dir_name();
    }
    else{
 
        vectorOfPath.push_back(argv[1]);
        chdir (argv[1]);
        //cout<<get_current_dir_name();
        curr_dir = get_current_dir_name();
    }
    return 0;
 
}
 
int myLs(){
    DIR *dp = NULL;
    struct dirent *dptr = NULL;
    unsigned int count = 0;
    dp = opendir((const char*)curr_dir);
    if(NULL == dp)
    {
        printf("\n ERROR : Could not open the working directory\n");
        return -1;
    }
 
    for(count = 0; NULL != (dptr = readdir(dp)); count++)
    {
        // Check if the name of the file/folder begins with '.'
        // If yes, then do not display it.
        if(dptr->d_name[0] != '.')
            printf("%s  ",dptr->d_name);
    }
 
    return 0;
}
 
int myRm(char** argv){
    if( remove(argv[1]) != 0 )
        perror( "Error deleting file" );
    else
        puts("File successfully deleted");
 
}
 
 
int doLS(char* prog, char** argv){
    if (!strcmp (prog, " ") & (argv[1] == NULL))
    {
        myLs();
 
    }
    else
    {
        pid_t kidpid = fork();
 
        if (kidpid < 0)
        {
            perror( "Internal error: cannot fork." );
            return -1;
        }
        else if (kidpid == 0)
        {
            // I am the child.
            //cout << "BLA BLA BLA ZNOW HUYNIA" << endl << prog << endl;
            char *cmd = (char *) myLs();
            // abo mozna she tak v'ibaty:
            //execvp (*cmd, argv);
 
            execvp (prog, argv);
 
            // The following lines should not happen (normally).
            //perror( command );
            return -1;
        }
        else
        {
            // I am the parent.  Wait for the child.
            if ( waitpid( kidpid, 0, 0 ) < 0 )
            {
                perror( "Internal error: cannot wait for child." );
                return -1;
            }
        }
    }
 
 
    return 0;
 
}
 
int doRM(char* prog, char** argv){
    if (!strcmp (prog, " ") & (argv[1] !=NULL))
    {
        myRm((char **) argv[1]);
 
    }
    else
    {
        pid_t kidpid = fork();
 
        if (kidpid < 0)
        {
            perror( "Internal error: cannot fork." );
            return -1;
        }
        else if (kidpid == 0)
        {
            // I am the child.
            //cout << "BLA BLA BLA ZNOW HUYNIA" << endl << prog << endl;
            char *cmd = (char *) myRm(argv);
            // abo mozna she tak v'ibaty:
            //execvp (*cmd, argv);
 
            execvp (prog, argv);
 
            // The following lines should not happen (normally).
            //perror( command );
            return -1;
        }
        else
        {
            // I am the parent.  Wait for the child.
            if ( waitpid( kidpid, 0, 0 ) < 0 )
            {
                perror( "Internal error: cannot wait for child." );
                return -1;
            }
        }
    }
 
 
    return 0;
 
}
 
 
 
int main(int argc, char* argv[], char**env)
{
    /*
        pid_t pid = fork();
        if (pid == -1)
        {
            cout << "ERROR" << &endl;
        }
        else if (pid > 0)
        {
            int status;
            waitpid(pid, &status, 0);
        }
        else {
            char cwd[1024];
            getcwd(cwd, sizeof(cwd));
            //printf( "%s\n", cwd);
            execve("/bin/ls", argv, env);
            _exit(EXIT_FAILURE);
        }*/
 
    while(true)  {
        //string command;
        // char commandChar[1024];    // Will store the command entered by user in character array
        // char *argVector[10];    // Will store the arguments after they are tokenized
        //int argCount;        // Will store the number of arguments
 
        //char cwd[1024];
        //getcwd(cwd, sizeof(cwd));
        //printf( "%s$\n", cwd);
 
        cout << curr_dir << "$";
        char command[128];
        cin.getline( command, 128 );
 
        vector<char*> args;
        char* prog = strtok( command, " " );
        char* tmp = prog;
        while ( tmp != NULL )
        {
            args.push_back( tmp );
            tmp = strtok( NULL, " " );
        }
 
        char** argv = args.data();
 
        argv[args.size()] = NULL;
 
 
        if ((string(prog)=="pwd")){
 
            cout << curr_dir;
        }
        else if ((string(prog)=="ls")){
            //cout << "asv" <<endl;
            doLS(prog, argv);
 
        }
        else if((string(prog)=="cd")){
            cd(argv);
            //doLS(prog, argv);
        }
 
        else if(string(prog) == "mrm"){
            doRM(prog, argv);
        }
 
        else if((string(prog)=="exit")){
            break;
        }
 
        cout << "\n";
 
 
        //cout << input << endl;
 
 
 
        /*
        ptr = strtok(commandChar, " ");
        argVector[argCount] = ptr;
        argCount++;
        while (ptr != NULL)
        {
            ptr = strtok(commandChar, " ");
            cout << ptr << " " << argCount << "\n";
            argVector[argCount] = ptr;
            argCount++;
            //execvp(argvec[0], argvec);
            //fatal("exec failed");
        }
*/
    }
 
    return 0;
 
}

prog.cpp:1:1: error: stray ‘##’ in program
 ##include <iostream>
 ^~
prog.cpp:1:3: error: ‘include’ does not name a type
 ##include <iostream>
   ^~~~~~~
In file included from /usr/include/signal.h:75:0,
                 from /usr/include/x86_64-linux-gnu/sys/wait.h:29,
                 from prog.cpp:3:
/usr/include/time.h:122:5: error: ‘__time_t’ does not name a type
     __time_t tv_sec;  /* Seconds.  */
     ^~~~~~~~
/usr/include/time.h:123:5: error: ‘__syscall_slong_t’ does not name a type
     __syscall_slong_t tv_nsec; /* Nanoseconds.  */
     ^~~~~~~~~~~~~~~~~
In file included from /usr/include/signal.h:80:0,
                 from /usr/include/x86_64-linux-gnu/sys/wait.h:29,
                 from prog.cpp:3:
/usr/include/x86_64-linux-gnu/bits/siginfo.h:58:9: error: ‘__clock_t’ does not name a type
 typedef __clock_t __sigchld_clock_t;
         ^~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/siginfo.h:76:6: error: ‘__pid_t’ does not name a type
      __pid_t si_pid; /* Sending process ID.  */
      ^~~~~~~
/usr/include/x86_64-linux-gnu/bits/siginfo.h:77:6: error: ‘__uid_t’ does not name a type
      __uid_t si_uid; /* Real user ID of sending process.  */
      ^~~~~~~
/usr/include/x86_64-linux-gnu/bits/siginfo.h:91:6: error: ‘__pid_t’ does not name a type
      __pid_t si_pid; /* Sending process ID.  */
      ^~~~~~~
/usr/include/x86_64-linux-gnu/bits/siginfo.h:92:6: error: ‘__uid_t’ does not name a type
      __uid_t si_uid; /* Real user ID of sending process.  */
      ^~~~~~~
/usr/include/x86_64-linux-gnu/bits/siginfo.h:99:6: error: ‘__pid_t’ does not name a type
      __pid_t si_pid; /* Which child.  */
      ^~~~~~~
/usr/include/x86_64-linux-gnu/bits/siginfo.h:100:6: error: ‘__uid_t’ does not name a type
      __uid_t si_uid; /* Real user ID of sending process.  */
      ^~~~~~~
/usr/include/x86_64-linux-gnu/bits/siginfo.h:102:6: error: ‘__sigchld_clock_t’ does not name a type
      __sigchld_clock_t si_utime;
      ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/siginfo.h:103:6: error: ‘__sigchld_clock_t’ does not name a type
      __sigchld_clock_t si_stime;
      ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/siginfo.h:332:2: error: ‘__pid_t’ does not name a type
  __pid_t _tid;
  ^~~~~~~
In file included from /usr/include/x86_64-linux-gnu/sys/wait.h:29:0,
                 from prog.cpp:3:
/usr/include/signal.h:127:18: error: ‘__pid_t’ was not declared in this scope
 extern int kill (__pid_t __pid, int __sig) __THROW;
                  ^~~~~~~
/usr/include/signal.h:127:33: error: expected primary-expression before ‘int’
 extern int kill (__pid_t __pid, int __sig) __THROW;
                                 ^~~
/usr/include/signal.h:127:42: error: expression list treated as compound expression in initializer [-fpermissive]
 extern int kill (__pid_t __pid, int __sig) __THROW;
                                          ^
/usr/include/signal.h:134:20: error: ‘__pid_t’ was not declared in this scope
 extern int killpg (__pid_t __pgrp, int __sig) __THROW;
                    ^~~~~~~
/usr/include/signal.h:134:36: error: expected primary-expression before ‘int’
 extern int killpg (__pid_t __pgrp, int __sig) __THROW;
                                    ^~~
/usr/include/signal.h:134:45: error: expression list treated as compound expression in initializer [-fpermissive]
 extern int killpg (__pid_t __pgrp, int __sig) __THROW;
                                             ^
In file included from /usr/include/x86_64-linux-gnu/sys/wait.h:29:0,
                 from prog.cpp:3:
/usr/include/signal.h:291:22: error: ‘__pid_t’ was not declared in this scope
 extern int sigqueue (__pid_t __pid, int __sig, const union sigval __val)
                      ^~~~~~~
/usr/include/signal.h:291:37: error: expected primary-expression before ‘int’
 extern int sigqueue (__pid_t __pid, int __sig, const union sigval __val)
                                     ^~~
/usr/include/signal.h:291:48: error: expected primary-expression before ‘const’
 extern int sigqueue (__pid_t __pid, int __sig, const union sigval __val)
                                                ^~~~~
/usr/include/signal.h:291:72: error: expression list treated as compound expression in initializer [-fpermissive]
 extern int sigqueue (__pid_t __pid, int __sig, const union sigval __val)
                                                                        ^
In file included from /usr/include/signal.h:306:0,
                 from /usr/include/x86_64-linux-gnu/sys/wait.h:29,
                 from prog.cpp:3:
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:31:3: error: ‘__uint32_t’ does not name a type
   __uint32_t magic1;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:32:3: error: ‘__uint32_t’ does not name a type
   __uint32_t extended_size;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:33:3: error: ‘__uint64_t’ does not name a type
   __uint64_t xstate_bv;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:34:3: error: ‘__uint32_t’ does not name a type
   __uint32_t xstate_size;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:35:3: error: ‘__uint32_t’ does not name a type
   __uint32_t padding[7];
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:53:3: error: ‘__uint32_t’ does not name a type
   __uint32_t element[4];
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:124:3: error: ‘__uint16_t’ does not name a type
   __uint16_t  cwd;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:125:3: error: ‘__uint16_t’ does not name a type
   __uint16_t  swd;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:126:3: error: ‘__uint16_t’ does not name a type
   __uint16_t  ftw;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:127:3: error: ‘__uint16_t’ does not name a type
   __uint16_t  fop;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:128:3: error: ‘__uint64_t’ does not name a type
   __uint64_t  rip;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:129:3: error: ‘__uint64_t’ does not name a type
   __uint64_t  rdp;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:130:3: error: ‘__uint32_t’ does not name a type
   __uint32_t  mxcsr;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:131:3: error: ‘__uint32_t’ does not name a type
   __uint32_t  mxcr_mask;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:134:3: error: ‘__uint32_t’ does not name a type
   __uint32_t  padding[24];
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:139:3: error: ‘__uint64_t’ does not name a type
   __uint64_t r8;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:140:3: error: ‘__uint64_t’ does not name a type
   __uint64_t r9;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:141:3: error: ‘__uint64_t’ does not name a type
   __uint64_t r10;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:142:3: error: ‘__uint64_t’ does not name a type
   __uint64_t r11;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:143:3: error: ‘__uint64_t’ does not name a type
   __uint64_t r12;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:144:3: error: ‘__uint64_t’ does not name a type
   __uint64_t r13;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:145:3: error: ‘__uint64_t’ does not name a type
   __uint64_t r14;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:146:3: error: ‘__uint64_t’ does not name a type
   __uint64_t r15;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:147:3: error: ‘__uint64_t’ does not name a type
   __uint64_t rdi;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:148:3: error: ‘__uint64_t’ does not name a type
   __uint64_t rsi;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:149:3: error: ‘__uint64_t’ does not name a type
   __uint64_t rbp;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:150:3: error: ‘__uint64_t’ does not name a type
   __uint64_t rbx;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:151:3: error: ‘__uint64_t’ does not name a type
   __uint64_t rdx;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:152:3: error: ‘__uint64_t’ does not name a type
   __uint64_t rax;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:153:3: error: ‘__uint64_t’ does not name a type
   __uint64_t rcx;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:154:3: error: ‘__uint64_t’ does not name a type
   __uint64_t rsp;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:155:3: error: ‘__uint64_t’ does not name a type
   __uint64_t rip;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:156:3: error: ‘__uint64_t’ does not name a type
   __uint64_t eflags;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:161:3: error: ‘__uint64_t’ does not name a type
   __uint64_t err;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:162:3: error: ‘__uint64_t’ does not name a type
   __uint64_t trapno;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:163:3: error: ‘__uint64_t’ does not name a type
   __uint64_t oldmask;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:164:3: error: ‘__uint64_t’ does not name a type
   __uint64_t cr2;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:168:7: error: ‘__uint64_t’ does not name a type
       __uint64_t __fpstate_word;
       ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:170:3: error: ‘__uint64_t’ does not name a type
   __uint64_t __reserved1 [8];
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:177:3: error: ‘__uint64_t’ does not name a type
   __uint64_t xstate_bv;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:178:3: error: ‘__uint64_t’ does not name a type
   __uint64_t reserved1[2];
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:179:3: error: ‘__uint64_t’ does not name a type
   __uint64_t reserved2[5];
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/sigcontext.h:184:3: error: ‘__uint32_t’ does not name a type
   __uint32_t ymmh_space[64];
   ^~~~~~~~~~
In file included from /usr/include/signal.h:323:0,
                 from /usr/include/x86_64-linux-gnu/sys/wait.h:29,
                 from prog.cpp:3:
/usr/include/x86_64-linux-gnu/bits/sigstack.h:53:5: error: ‘size_t’ does not name a type
     size_t ss_size;
     ^~~~~~
In file included from /usr/include/signal.h:326:0,
                 from /usr/include/x86_64-linux-gnu/sys/wait.h:29,
                 from prog.cpp:3:
/usr/include/x86_64-linux-gnu/sys/ucontext.h:101:3: error: ‘__uint32_t’ does not name a type
   __uint32_t element[4];
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/ucontext.h:107:3: error: ‘__uint16_t’ does not name a type
   __uint16_t  cwd;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/ucontext.h:108:3: error: ‘__uint16_t’ does not name a type
   __uint16_t  swd;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/ucontext.h:109:3: error: ‘__uint16_t’ does not name a type
   __uint16_t  ftw;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/ucontext.h:110:3: error: ‘__uint16_t’ does not name a type
   __uint16_t  fop;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/ucontext.h:111:3: error: ‘__uint64_t’ does not name a type
   __uint64_t  rip;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/ucontext.h:112:3: error: ‘__uint64_t’ does not name a type
   __uint64_t  rdp;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/ucontext.h:113:3: error: ‘__uint32_t’ does not name a type
   __uint32_t  mxcsr;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/ucontext.h:114:3: error: ‘__uint32_t’ does not name a type
   __uint32_t  mxcr_mask;
   ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/ucontext.h:117:3: error: ‘__uint32_t’ does not name a type
   __uint32_t  padding[24];
   ^~~~~~~~~~
In file included from prog.cpp:3:0:
/usr/include/x86_64-linux-gnu/sys/wait.h:63:8: error: ‘__pid_t’ does not name a type
 extern __pid_t wait (int *__stat_loc);
        ^~~~~~~
/usr/include/x86_64-linux-gnu/sys/wait.h:86:8: error: ‘__pid_t’ does not name a type
 extern __pid_t waitpid (__pid_t __pid, int *__stat_loc, int __options);
        ^~~~~~~
/usr/include/x86_64-linux-gnu/sys/wait.h:91:9: error: ‘__id_t’ does not name a type
 typedef __id_t id_t;
         ^~~~~~
In file included from prog.cpp:3:0:
/usr/include/x86_64-linux-gnu/sys/wait.h:109:39: error: ‘__id_t’ has not been declared
 extern int waitid (idtype_t __idtype, __id_t __id, siginfo_t *__infop,
                                       ^~~~~~
/usr/include/x86_64-linux-gnu/sys/wait.h:123:8: error: ‘__pid_t’ does not name a type
 extern __pid_t wait3 (int *__stat_loc, int __options,
        ^~~~~~~
/usr/include/x86_64-linux-gnu/sys/wait.h:129:8: error: ‘__pid_t’ does not name a type
 extern __pid_t wait4 (__pid_t __pid, int *__stat_loc, int __options,
        ^~~~~~~
In file included from prog.cpp:5:0:
/usr/include/dirent.h:34:9: error: ‘__ino_t’ does not name a type
 typedef __ino_t ino_t;
         ^~~~~~~
/usr/include/dirent.h:41:9: error: ‘__ino64_t’ does not name a type
 typedef __ino64_t ino64_t;
         ^~~~~~~~~
In file included from /usr/include/dirent.h:61:0,
                 from prog.cpp:5:
/usr/include/x86_64-linux-gnu/bits/dirent.h:25:5: error: ‘__ino_t’ does not name a type
     __ino_t d_ino;
     ^~~~~~~
/usr/include/x86_64-linux-gnu/bits/dirent.h:26:5: error: ‘__off_t’ does not name a type
     __off_t d_off;
     ^~~~~~~
/usr/include/x86_64-linux-gnu/bits/dirent.h:39:5: error: ‘__ino64_t’ does not name a type
     __ino64_t d_ino;
     ^~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/dirent.h:40:5: error: ‘__off64_t’ does not name a type
     __off64_t d_off;
     ^~~~~~~~~
In file included from prog.cpp:5:0:
/usr/include/dirent.h:353:8: error: ‘__ssize_t’ does not name a type
 extern __ssize_t getdirentries (int __fd, char *__restrict __buf,
        ^~~~~~~~~
/usr/include/dirent.h:370:8: error: ‘__ssize_t’ does not name a type
 extern __ssize_t getdirentries64 (int __fd, char *__restrict __buf,
        ^~~~~~~~~
In file included from /usr/include/c++/6/cwchar:44:0,
                 from /usr/include/c++/6/bits/postypes.h:40,
                 from /usr/include/c++/6/iosfwd:40,
                 from /usr/include/c++/6/ios:38,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/wchar.h:153:38: error: ‘size_t’ has not been declared
     const wchar_t *__restrict __src, size_t __n)
                                      ^~~~~~
/usr/include/wchar.h:162:38: error: ‘size_t’ has not been declared
     const wchar_t *__restrict __src, size_t __n)
                                      ^~~~~~
/usr/include/wchar.h:169:63: error: ‘size_t’ has not been declared
 extern int wcsncmp (const wchar_t *__s1, const wchar_t *__s2, size_t __n)
                                                               ^~~~~~
/usr/include/wchar.h:179:4: error: ‘size_t’ has not been declared
    size_t __n) __THROW;
    ^~~~~~
In file included from /usr/include/c++/6/cwchar:44:0,
                 from /usr/include/c++/6/bits/postypes.h:40,
                 from /usr/include/c++/6/iosfwd:40,
                 from /usr/include/c++/6/ios:38,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/wchar.h:189:6: error: ‘size_t’ has not been declared
      size_t __n, __locale_t __loc) __THROW;
      ^~~~~~
/usr/include/wchar.h:199:8: error: ‘size_t’ does not name a type
 extern size_t wcsxfrm (wchar_t *__restrict __s1,
        ^~~~~~
/usr/include/wchar.h:215:8: error: ‘size_t’ does not name a type
 extern size_t wcsxfrm_l (wchar_t *__s1, const wchar_t *__s2,
        ^~~~~~
/usr/include/wchar.h:255:8: error: ‘size_t’ does not name a type
 extern size_t wcscspn (const wchar_t *__wcs, const wchar_t *__reject)
        ^~~~~~
/usr/include/wchar.h:259:8: error: ‘size_t’ does not name a type
 extern size_t wcsspn (const wchar_t *__wcs, const wchar_t *__accept)
        ^~~~~~
/usr/include/wchar.h:290:8: error: ‘size_t’ does not name a type
 extern size_t wcslen (const wchar_t *__s) __THROW __attribute_pure__;
        ^~~~~~
/usr/include/wchar.h:309:8: error: ‘size_t’ does not name a type
 extern size_t wcsnlen (const wchar_t *__s, size_t __maxlen)
        ^~~~~~
/usr/include/wchar.h:317:59: error: ‘size_t’ has not been declared
 extern "C++" wchar_t *wmemchr (wchar_t *__s, wchar_t __c, size_t __n)
                                                           ^~~~~~
/usr/include/wchar.h:320:10: error: ‘size_t’ has not been declared
          size_t __n)
          ^~~~~~
/usr/include/wchar.h:328:63: error: ‘size_t’ has not been declared
 extern int wmemcmp (const wchar_t *__s1, const wchar_t *__s2, size_t __n)
                                                               ^~~~~~
/usr/include/wchar.h:333:37: error: ‘size_t’ has not been declared
     const wchar_t *__restrict __s2, size_t __n) __THROW;
                                     ^~~~~~
/usr/include/wchar.h:337:63: error: ‘size_t’ has not been declared
 extern wchar_t *wmemmove (wchar_t *__s1, const wchar_t *__s2, size_t __n)
                                                               ^~~~~~
/usr/include/wchar.h:341:53: error: ‘size_t’ has not been declared
 extern wchar_t *wmemset (wchar_t *__s, wchar_t __c, size_t __n) __THROW;
                                                     ^~~~~~
/usr/include/wchar.h:348:38: error: ‘size_t’ has not been declared
      const wchar_t *__restrict __s2, size_t __n)
                                      ^~~~~~
/usr/include/wchar.h:368:8: error: ‘size_t’ does not name a type
 extern size_t mbrtowc (wchar_t *__restrict __pwc,
        ^~~~~~
/usr/include/wchar.h:373:8: error: ‘size_t’ does not name a type
 extern size_t wcrtomb (char *__restrict __s, wchar_t __wc,
        ^~~~~~
/usr/include/wchar.h:377:8: error: ‘size_t’ does not name a type
 extern size_t __mbrlen (const char *__restrict __s, size_t __n,
        ^~~~~~
/usr/include/wchar.h:379:8: error: ‘size_t’ does not name a type
 extern size_t mbrlen (const char *__restrict __s, size_t __n,
        ^~~~~~
/usr/include/wchar.h:401:17: error: ‘size_t’ does not name a type
 __extern_inline size_t
                 ^~~~~~
/usr/include/wchar.h:411:8: error: ‘size_t’ does not name a type
 extern size_t mbsrtowcs (wchar_t *__restrict __dst,
        ^~~~~~
/usr/include/wchar.h:417:8: error: ‘size_t’ does not name a type
 extern size_t wcsrtombs (char *__restrict __dst,
        ^~~~~~
/usr/include/wchar.h:426:8: error: ‘size_t’ does not name a type
 extern size_t mbsnrtowcs (wchar_t *__restrict __dst,
        ^~~~~~
/usr/include/wchar.h:432:8: error: ‘size_t’ does not name a type
 extern size_t wcsnrtombs (char *__restrict __dst,
        ^~~~~~
/usr/include/wchar.h:446:42: error: ‘size_t’ has not been declared
 extern int wcswidth (const wchar_t *__s, size_t __n) __THROW;
                                          ^~~~~~
/usr/include/wchar.h:575:38: error: ‘size_t’ has not been declared
     const wchar_t *__restrict __src, size_t __n)
                                      ^~~~~~
/usr/include/wchar.h:583:53: error: ‘size_t’ has not been declared
 extern __FILE *open_wmemstream (wchar_t **__bufloc, size_t *__sizeloc) __THROW;
                                                     ^~~~~~
/usr/include/wchar.h:607:47: error: ‘size_t’ has not been declared
 extern int swprintf (wchar_t *__restrict __s, size_t __n,
                                               ^~~~~~
/usr/include/wchar.h:628:48: error: ‘size_t’ has not been declared
 extern int vswprintf (wchar_t *__restrict __s, size_t __n,
                                                ^~~~~~
/usr/include/wchar.h:858:8: error: ‘size_t’ does not name a type
 extern size_t wcsftime (wchar_t *__restrict __s, size_t __maxsize,
        ^~~~~~
/usr/include/wchar.h:868:8: error: ‘size_t’ does not name a type
 extern size_t wcsftime_l (wchar_t *__restrict __s, size_t __maxsize,
        ^~~~~~
In file included from /usr/include/c++/6/bits/postypes.h:40:0,
                 from /usr/include/c++/6/iosfwd:40,
                 from /usr/include/c++/6/ios:38,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/c++/6/cwchar:151:11: error: ‘::mbrlen’ has not been declared
   using ::mbrlen;
           ^~~~~~
/usr/include/c++/6/cwchar:152:11: error: ‘::mbrtowc’ has not been declared
   using ::mbrtowc;
           ^~~~~~~
/usr/include/c++/6/cwchar:154:11: error: ‘::mbsrtowcs’ has not been declared
   using ::mbsrtowcs;
           ^~~~~~~~~
/usr/include/c++/6/cwchar:176:11: error: ‘::wcrtomb’ has not been declared
   using ::wcrtomb;
           ^~~~~~~
/usr/include/c++/6/cwchar:181:11: error: ‘::wcscspn’ has not been declared
   using ::wcscspn;
           ^~~~~~~
/usr/include/c++/6/cwchar:182:11: error: ‘::wcsftime’ has not been declared
   using ::wcsftime;
           ^~~~~~~~
/usr/include/c++/6/cwchar:183:11: error: ‘::wcslen’ has not been declared
   using ::wcslen;
           ^~~~~~
/usr/include/c++/6/cwchar:187:11: error: ‘::wcsrtombs’ has not been declared
   using ::wcsrtombs;
           ^~~~~~~~~
/usr/include/c++/6/cwchar:188:11: error: ‘::wcsspn’ has not been declared
   using ::wcsspn;
           ^~~~~~
/usr/include/c++/6/cwchar:196:11: error: ‘::wcsxfrm’ has not been declared
   using ::wcsxfrm;
           ^~~~~~~
In file included from /usr/include/c++/6/ios:40:0,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/c++/6/bits/char_traits.h: In static member function ‘static std::size_t std::char_traits<wchar_t>::length(const char_type*)’:
/usr/include/c++/6/bits/char_traits.h:358:26: error: ‘wcslen’ was not declared in this scope
       { return wcslen(__s); }
                          ^
In file included from /usr/include/c++/6/bits/char_traits.h:420:0,
                 from /usr/include/c++/6/ios:40,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/c++/6/cstdint: At global scope:
/usr/include/c++/6/cstdint:64:11: error: ‘::intptr_t’ has not been declared
   using ::intptr_t;
           ^~~~~~~~
In file included from /usr/include/endian.h:60:0,
                 from /usr/include/ctype.h:39,
                 from /usr/include/c++/6/cctype:42,
                 from /usr/include/c++/6/bits/localefwd.h:42,
                 from /usr/include/c++/6/ios:41,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/bits/byteswap.h:108:17: error: ‘__uint64_t’ does not name a type
 static __inline __uint64_t
                 ^~~~~~~~~~
In file included from /usr/include/c++/6/cctype:42:0,
                 from /usr/include/c++/6/bits/localefwd.h:42,
                 from /usr/include/c++/6/ios:41,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/ctype.h:81:14: error: ‘__int32_t’ does not name a type
 extern const __int32_t **__ctype_tolower_loc (void)
              ^~~~~~~~~
/usr/include/ctype.h:83:14: error: ‘__int32_t’ does not name a type
 extern const __int32_t **__ctype_toupper_loc (void)
              ^~~~~~~~~
In file included from /usr/include/sched.h:34:0,
                 from /usr/include/pthread.h:23,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr-default.h:35,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr.h:148,
                 from /usr/include/c++/6/ext/atomicity.h:35,
                 from /usr/include/c++/6/bits/ios_base.h:39,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/time.h:75:9: error: ‘__time_t’ does not name a type
 typedef __time_t time_t;
         ^~~~~~~~
In file included from /usr/include/sched.h:43:0,
                 from /usr/include/pthread.h:23,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr-default.h:35,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr.h:148,
                 from /usr/include/c++/6/ext/atomicity.h:35,
                 from /usr/include/c++/6/bits/ios_base.h:39,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/bits/sched.h:204:30: error: ‘size_t’ was not declared in this scope
 extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
                              ^~~~~~
/usr/include/x86_64-linux-gnu/bits/sched.h:204:30: note: suggested alternative:
In file included from /usr/include/c++/6/iosfwd:38:0,
                 from /usr/include/c++/6/ios:38,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/c++/6/bits/c++config.h:201:26: note:   ‘std::size_t’
   typedef __SIZE_TYPE__  size_t;
                          ^~~~~~
In file included from /usr/include/sched.h:43:0,
                 from /usr/include/pthread.h:23,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr-default.h:35,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr.h:148,
                 from /usr/include/c++/6/ext/atomicity.h:35,
                 from /usr/include/c++/6/bits/ios_base.h:39,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/bits/sched.h:204:48: error: expected primary-expression before ‘const’
 extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
                                                ^~~~~
/usr/include/x86_64-linux-gnu/bits/sched.h:204:71: error: expression list treated as compound expression in initializer [-fpermissive]
 extern int __sched_cpucount (size_t __setsize, const cpu_set_t *__setp)
                                                                       ^
/usr/include/x86_64-linux-gnu/bits/sched.h:206:37: error: ‘size_t’ was not declared in this scope
 extern cpu_set_t *__sched_cpualloc (size_t __count) __THROW __wur;
                                     ^~~~~~
/usr/include/x86_64-linux-gnu/bits/sched.h:206:37: note: suggested alternative:
In file included from /usr/include/c++/6/iosfwd:38:0,
                 from /usr/include/c++/6/ios:38,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/c++/6/bits/c++config.h:201:26: note:   ‘std::size_t’
   typedef __SIZE_TYPE__  size_t;
                          ^~~~~~
In file included from /usr/include/pthread.h:23:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr-default.h:35,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr.h:148,
                 from /usr/include/c++/6/ext/atomicity.h:35,
                 from /usr/include/c++/6/bits/ios_base.h:39,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/sched.h:51:28: error: ‘__pid_t’ was not declared in this scope
 extern int sched_setparam (__pid_t __pid, const struct sched_param *__param)
                            ^~~~~~~
/usr/include/sched.h:51:43: error: expected primary-expression before ‘const’
 extern int sched_setparam (__pid_t __pid, const struct sched_param *__param)
                                           ^~~~~
/usr/include/sched.h:51:76: error: expression list treated as compound expression in initializer [-fpermissive]
 extern int sched_setparam (__pid_t __pid, const struct sched_param *__param)
                                                                            ^
/usr/include/sched.h:55:28: error: ‘__pid_t’ was not declared in this scope
 extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW;
                            ^~~~~~~
/usr/include/sched.h:55:43: error: expected primary-expression before ‘struct’
 extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW;
                                           ^~~~~~
/usr/include/sched.h:55:70: error: expression list treated as compound expression in initializer [-fpermissive]
 extern int sched_getparam (__pid_t __pid, struct sched_param *__param) __THROW;
                                                                      ^
/usr/include/sched.h:58:32: error: ‘__pid_t’ was not declared in this scope
 extern int sched_setscheduler (__pid_t __pid, int __policy,
                                ^~~~~~~
/usr/include/sched.h:58:47: error: expected primary-expression before ‘int’
 extern int sched_setscheduler (__pid_t __pid, int __policy,
                                               ^~~
/usr/include/sched.h:59:11: error: expected primary-expression before ‘const’
           const struct sched_param *__param) __THROW;
           ^~~~~
/usr/include/sched.h:59:44: error: expression list treated as compound expression in initializer [-fpermissive]
           const struct sched_param *__param) __THROW;
                                            ^
/usr/include/sched.h:62:32: error: ‘__pid_t’ was not declared in this scope
 extern int sched_getscheduler (__pid_t __pid) __THROW;
                                ^~~~~~~
/usr/include/sched.h:74:35: error: ‘__pid_t’ was not declared in this scope
 extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW;
                                   ^~~~~~~
/usr/include/sched.h:74:50: error: expected primary-expression before ‘struct’
 extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW;
                                                  ^~~~~~
/usr/include/sched.h:74:70: error: expression list treated as compound expression in initializer [-fpermissive]
 extern int sched_rr_get_interval (__pid_t __pid, struct timespec *__t) __THROW;
                                                                      ^
/usr/include/sched.h:118:31: error: ‘__pid_t’ was not declared in this scope
 extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize,
                               ^~~~~~~
/usr/include/sched.h:118:46: error: ‘size_t’ was not declared in this scope
 extern int sched_setaffinity (__pid_t __pid, size_t __cpusetsize,
                                              ^~~~~~
/usr/include/sched.h:118:46: note: suggested alternative:
In file included from /usr/include/c++/6/iosfwd:38:0,
                 from /usr/include/c++/6/ios:38,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/c++/6/bits/c++config.h:201:26: note:   ‘std::size_t’
   typedef __SIZE_TYPE__  size_t;
                          ^~~~~~
In file included from /usr/include/pthread.h:23:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr-default.h:35,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr.h:148,
                 from /usr/include/c++/6/ext/atomicity.h:35,
                 from /usr/include/c++/6/bits/ios_base.h:39,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/sched.h:119:10: error: expected primary-expression before ‘const’
          const cpu_set_t *__cpuset) __THROW;
          ^~~~~
/usr/include/sched.h:119:35: error: expression list treated as compound expression in initializer [-fpermissive]
          const cpu_set_t *__cpuset) __THROW;
                                   ^
/usr/include/sched.h:122:31: error: ‘__pid_t’ was not declared in this scope
 extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize,
                               ^~~~~~~
/usr/include/sched.h:122:46: error: ‘size_t’ was not declared in this scope
 extern int sched_getaffinity (__pid_t __pid, size_t __cpusetsize,
                                              ^~~~~~
/usr/include/sched.h:122:46: note: suggested alternative:
In file included from /usr/include/c++/6/iosfwd:38:0,
                 from /usr/include/c++/6/ios:38,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/c++/6/bits/c++config.h:201:26: note:   ‘std::size_t’
   typedef __SIZE_TYPE__  size_t;
                          ^~~~~~
In file included from /usr/include/pthread.h:23:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr-default.h:35,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr.h:148,
                 from /usr/include/c++/6/ext/atomicity.h:35,
                 from /usr/include/c++/6/bits/ios_base.h:39,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/sched.h:123:20: error: expected primary-expression before ‘*’ token
          cpu_set_t *__cpuset) __THROW;
                    ^
/usr/include/sched.h:123:21: error: ‘__cpuset’ was not declared in this scope
          cpu_set_t *__cpuset) __THROW;
                     ^~~~~~~~
/usr/include/sched.h:123:29: error: expression list treated as compound expression in initializer [-fpermissive]
          cpu_set_t *__cpuset) __THROW;
                             ^
In file included from /usr/include/time.h:41:0,
                 from /usr/include/pthread.h:24,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr-default.h:35,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr.h:148,
                 from /usr/include/c++/6/ext/atomicity.h:35,
                 from /usr/include/c++/6/bits/ios_base.h:39,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/bits/time.h:32:5: error: ‘__time_t’ does not name a type
     __time_t tv_sec;  /* Seconds.  */
     ^~~~~~~~
/usr/include/x86_64-linux-gnu/bits/time.h:33:5: error: ‘__suseconds_t’ does not name a type
     __suseconds_t tv_usec; /* Microseconds.  */
     ^~~~~~~~~~~~~
In file included from /usr/include/x86_64-linux-gnu/bits/time.h:88:0,
                 from /usr/include/time.h:41,
                 from /usr/include/pthread.h:24,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr-default.h:35,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr.h:148,
                 from /usr/include/c++/6/ext/atomicity.h:35,
                 from /usr/include/c++/6/bits/ios_base.h:39,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/bits/timex.h:28:3: error: ‘__syscall_slong_t’ does not name a type
   __syscall_slong_t offset; /* time offset (usec) */
   ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/timex.h:29:3: error: ‘__syscall_slong_t’ does not name a type
   __syscall_slong_t freq; /* frequency offset (scaled ppm) */
   ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/timex.h:30:3: error: ‘__syscall_slong_t’ does not name a type
   __syscall_slong_t maxerror; /* maximum error (usec) */
   ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/timex.h:31:3: error: ‘__syscall_slong_t’ does not name a type
   __syscall_slong_t esterror; /* estimated error (usec) */
   ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/timex.h:33:3: error: ‘__syscall_slong_t’ does not name a type
   __syscall_slong_t constant; /* pll time constant */
   ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/timex.h:34:3: error: ‘__syscall_slong_t’ does not name a type
   __syscall_slong_t precision; /* clock precision (usec) (ro) */
   ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/timex.h:35:3: error: ‘__syscall_slong_t’ does not name a type
   __syscall_slong_t tolerance; /* clock frequency tolerance (ppm) (ro) */
   ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/timex.h:37:3: error: ‘__syscall_slong_t’ does not name a type
   __syscall_slong_t tick; /* (modified) usecs between clock ticks */
   ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/timex.h:38:3: error: ‘__syscall_slong_t’ does not name a type
   __syscall_slong_t ppsfreq; /* pps frequency (scaled ppm) (ro) */
   ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/timex.h:39:3: error: ‘__syscall_slong_t’ does not name a type
   __syscall_slong_t jitter; /* pps jitter (us) (ro) */
   ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/timex.h:41:3: error: ‘__syscall_slong_t’ does not name a type
   __syscall_slong_t stabil; /* pps stability (scaled ppm) (ro) */
   ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/timex.h:42:3: error: ‘__syscall_slong_t’ does not name a type
   __syscall_slong_t jitcnt; /* jitter limit exceeded (ro) */
   ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/timex.h:43:3: error: ‘__syscall_slong_t’ does not name a type
   __syscall_slong_t calcnt; /* calibration intervals (ro) */
   ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/timex.h:44:3: error: ‘__syscall_slong_t’ does not name a type
   __syscall_slong_t errcnt; /* calibration errors (ro) */
   ^~~~~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/timex.h:45:3: error: ‘__syscall_slong_t’ does not name a type
   __syscall_slong_t stbcnt; /* stability limit exceeded (ro) */
   ^~~~~~~~~~~~~~~~~
In file included from /usr/include/time.h:41:0,
                 from /usr/include/pthread.h:24,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr-default.h:35,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr.h:148,
                 from /usr/include/c++/6/ext/atomicity.h:35,
                 from /usr/include/c++/6/bits/ios_base.h:39,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/bits/time.h:93:27: error: ‘__clockid_t’ was not declared in this scope
 extern int clock_adjtime (__clockid_t __clock_id, struct timex *__utx) __THROW;
                           ^~~~~~~~~~~
/usr/include/x86_64-linux-gnu/bits/time.h:93:51: error: expected primary-expression before ‘struct’
 extern int clock_adjtime (__clockid_t __clock_id, struct timex *__utx) __THROW;
                                                   ^~~~~~
/usr/include/x86_64-linux-gnu/bits/time.h:93:70: error: expression list treated as compound expression in initializer [-fpermissive]
 extern int clock_adjtime (__clockid_t __clock_id, struct timex *__utx) __THROW;
                                                                      ^
In file included from /usr/include/pthread.h:24:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr-default.h:35,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr.h:148,
                 from /usr/include/c++/6/ext/atomicity.h:35,
                 from /usr/include/c++/6/bits/ios_base.h:39,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/time.h:59:9: error: ‘__clock_t’ does not name a type
 typedef __clock_t clock_t;
         ^~~~~~~~~
/usr/include/time.h:91:9: error: ‘__clockid_t’ does not name a type
 typedef __clockid_t clockid_t;
         ^~~~~~~~~~~
/usr/include/time.h:103:9: error: ‘__timer_t’ does not name a type
 typedef __timer_t timer_t;
         ^~~~~~~~~
/usr/include/time.h:189:8: error: ‘clock_t’ does not name a type
 extern clock_t clock (void) __THROW;
        ^~~~~~~
/usr/include/time.h:192:8: error: ‘time_t’ does not name a type
 extern time_t time (time_t *__timer) __THROW;
        ^~~~~~
/usr/include/time.h:195:25: error: ‘time_t’ was not declared in this scope
 extern double difftime (time_t __time1, time_t __time0)
                         ^~~~~~
/usr/include/time.h:195:41: error: ‘time_t’ was not declared in this scope
 extern double difftime (time_t __time1, time_t __time0)
                                         ^~~~~~
/usr/include/time.h:195:55: error: expression list treated as compound expression in initializer [-fpermissive]
 extern double difftime (time_t __time1, time_t __time0)
                                                       ^
/usr/include/time.h:199:8: error: ‘time_t’ does not name a type
 extern time_t mktime (struct tm *__tp) __THROW;
        ^~~~~~
/usr/include/time.h:205:8: error: ‘size_t’ does not name a type
 extern size_t strftime (char *__restrict __s, size_t __maxsize,
        ^~~~~~
/usr/include/time.h:223:8: error: ‘size_t’ does not name a type
 extern size_t strftime_l (char *__restrict __s, size_t __maxsize,
        ^~~~~~
/usr/include/time.h:239:33: error: ‘time_t’ does not name a type
 extern struct tm *gmtime (const time_t *__timer) __THROW;
                                 ^~~~~~
/usr/include/time.h:243:36: error: ‘time_t’ does not name a type
 extern struct tm *localtime (const time_t *__timer) __THROW;
                                    ^~~~~~
/usr/include/time.h:249:35: error: ‘time_t’ does not name a type
 extern struct tm *gmtime_r (const time_t *__restrict __timer,
                                   ^~~~~~
/usr/include/time.h:254:38: error: ‘time_t’ does not name a type
 extern struct tm *localtime_r (const time_t *__restrict __timer,
                                      ^~~~~~
/usr/include/time.h:264:27: error: ‘time_t’ does not name a type
 extern char *ctime (const time_t *__timer) __THROW;
                           ^~~~~~
/usr/include/time.h:276:29: error: ‘time_t’ does not name a type
 extern char *ctime_r (const time_t *__restrict __timer,
                             ^~~~~~
/usr/include/time.h:304:25: error: ‘time_t’ does not name a type
 extern int stime (const time_t *__when) __THROW;
                         ^~~~~~
/usr/include/time.h:319:8: error: ‘time_t’ does not name a type
 extern time_t timegm (struct tm *__tp) __THROW;
        ^~~~~~
/usr/include/time.h:322:8: error: ‘time_t’ does not name a type
 extern time_t timelocal (struct tm *__tp) __THROW;
        ^~~~~~
/usr/include/time.h:339:26: error: ‘clockid_t’ was not declared in this scope
 extern int clock_getres (clockid_t __clock_id, struct timespec *__res) __THROW;
                          ^~~~~~~~~
/usr/include/time.h:339:48: error: expected primary-expression before ‘struct’
 extern int clock_getres (clockid_t __clock_id, struct timespec *__res) __THROW;
                                                ^~~~~~
/usr/include/time.h:339:70: error: expression list treated as compound expression in initializer [-fpermissive]
 extern int clock_getres (clockid_t __clock_id, struct timespec *__res) __THROW;
                                                                      ^
/usr/include/time.h:342:27: error: ‘clockid_t’ was not declared in this scope
 extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW;
                           ^~~~~~~~~
/usr/include/time.h:342:49: error: expected primary-expression before ‘struct’
 extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW;
                                                 ^~~~~~
/usr/include/time.h:342:70: error: expression list treated as compound expression in initializer [-fpermissive]
 extern int clock_gettime (clockid_t __clock_id, struct timespec *__tp) __THROW;
                                                                      ^
/usr/include/time.h:345:27: error: ‘clockid_t’ was not declared in this scope
 extern int clock_settime (clockid_t __clock_id, const struct timespec *__tp)
                           ^~~~~~~~~
/usr/include/time.h:345:49: error: expected primary-expression before ‘const’
 extern int clock_settime (clockid_t __clock_id, const struct timespec *__tp)
                                                 ^~~~~
/usr/include/time.h:345:76: error: expression list treated as compound expression in initializer [-fpermissive]
 extern int clock_settime (clockid_t __clock_id, const struct timespec *__tp)
                                                                            ^
/usr/include/time.h:353:29: error: ‘clockid_t’ was not declared in this scope
 extern int clock_nanosleep (clockid_t __clock_id, int __flags,
                             ^~~~~~~~~
/usr/include/time.h:353:51: error: expected primary-expression before ‘int’
 extern int clock_nanosleep (clockid_t __clock_id, int __flags,
                                                   ^~~
/usr/include/time.h:354:8: error: expected primary-expression before ‘const’
        const struct timespec *__req,
        ^~~~~
/usr/include/time.h:355:8: error: expected primary-expression before ‘struct’
        struct timespec *__rem);
        ^~~~~~
/usr/include/time.h:355:30: error: expression list treated as compound expression in initializer [-fpermissive]
        struct timespec *__rem);
                              ^
/usr/include/time.h:358:33: error: ‘pid_t’ was not declared in this scope
 extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __THROW;
                                 ^~~~~
/usr/include/time.h:358:46: error: ‘clockid_t’ was not declared in this scope
 extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __THROW;
                                              ^~~~~~~~~
/usr/include/time.h:358:57: error: ‘__clock_id’ was not declared in this scope
 extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __THROW;
                                                         ^~~~~~~~~~
/usr/include/time.h:358:67: error: expression list treated as compound expression in initializer [-fpermissive]
 extern int clock_getcpuclockid (pid_t __pid, clockid_t *__clock_id) __THROW;
                                                                   ^
/usr/include/time.h:363:26: error: ‘clockid_t’ was not declared in this scope
 extern int timer_create (clockid_t __clock_id,
                          ^~~~~~~~~
/usr/include/time.h:364:5: error: expected primary-expression before ‘struct’
     struct sigevent *__restrict __evp,
     ^~~~~~
/usr/include/time.h:365:5: error: ‘timer_t’ was not declared in this scope
     timer_t *__restrict __timerid) __THROW;
     ^~~~~~~
/usr/include/time.h:365:14: error: expected primary-expression before ‘__restrict’
     timer_t *__restrict __timerid) __THROW;
              ^~~~~~~~~~
/usr/include/time.h:365:34: error: expression list treated as compound expression in initializer [-fpermissive]
     timer_t *__restrict __timerid) __THROW;
                                  ^
/usr/include/time.h:368:26: error: ‘timer_t’ was not declared in this scope
 extern int timer_delete (timer_t __timerid) __THROW;
                          ^~~~~~~
/usr/include/time.h:371:27: error: ‘timer_t’ was not declared in this scope
 extern int timer_settime (timer_t __timerid, int __flags,
                           ^~~~~~~
/usr/include/time.h:371:46: error: expected primary-expression before ‘int’
 extern int timer_settime (timer_t __timerid, int __flags,
                                              ^~~
/usr/include/time.h:372:6: error: expected primary-expression before ‘const’
      const struct itimerspec *__restrict __value,
      ^~~~~
/usr/include/time.h:373:6: error: expected primary-expression before ‘struct’
      struct itimerspec *__restrict __ovalue) __THROW;
      ^~~~~~
/usr/include/time.h:373:44: error: expression list treated as compound expression in initializer [-fpermissive]
      struct itimerspec *__restrict __ovalue) __THROW;
                                            ^
/usr/include/time.h:376:27: error: ‘timer_t’ was not declared in this scope
 extern int timer_gettime (timer_t __timerid, struct itimerspec *__value)
                           ^~~~~~~
/usr/include/time.h:376:46: error: expected primary-expression before ‘struct’
 extern int timer_gettime (timer_t __timerid, struct itimerspec *__value)
                                              ^~~~~~
/usr/include/time.h:376:72: error: expression list treated as compound expression in initializer [-fpermissive]
 extern int timer_gettime (timer_t __timerid, struct itimerspec *__value)
                                                                        ^
/usr/include/time.h:380:30: error: ‘timer_t’ was not declared in this scope
 extern int timer_getoverrun (timer_t __timerid) __THROW;
                              ^~~~~~~
In file included from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr-default.h:35:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/gthr.h:148,
                 from /usr/include/c++/6/ext/atomicity.h:35,
                 from /usr/include/c++/6/bits/ios_base.h:39,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/pthread.h:306:11: error: ‘size_t’ has not been declared
           size_t *__guardsize)
           ^~~~~~
/usr/include/pthread.h:311:11: error: ‘size_t’ has not been declared
           size_t __guardsize)
           ^~~~~~
/usr/include/pthread.h:369:19: error: ‘size_t’ has not been declared
           __attr, size_t *__restrict __stacksize)
                   ^~~~~~
/usr/include/pthread.h:376:11: error: ‘size_t’ has not been declared
           size_t __stacksize)
           ^~~~~~
/usr/include/pthread.h:383:7: error: ‘size_t’ has not been declared
       size_t *__restrict __stacksize)
       ^~~~~~
/usr/include/pthread.h:390:7: error: ‘size_t’ has not been declared
       size_t __stacksize) __THROW __nonnull ((1));
       ^~~~~~
/usr/include/pthread.h:397:6: error: ‘size_t’ has not been declared
      size_t __cpusetsize,
      ^~~~~~
/usr/include/pthread.h:404:6: error: ‘size_t’ has not been declared
      size_t __cpusetsize,
      ^~~~~~
/usr/include/pthread.h:447:11: error: ‘size_t’ has not been declared
           size_t __buflen)
           ^~~~~~
/usr/include/pthread.h:474:52: error: ‘size_t’ has not been declared
 extern int pthread_setaffinity_np (pthread_t __th, size_t __cpusetsize,
                                                    ^~~~~~
/usr/include/pthread.h:479:52: error: ‘size_t’ has not been declared
 extern int pthread_getaffinity_np (pthread_t __th, size_t __cpusetsize,
                                                    ^~~~~~
/usr/include/pthread.h:1029:11: error: ‘__clockid_t’ has not been declared
           __clockid_t *__restrict __clock_id)
           ^~~~~~~~~~~
/usr/include/pthread.h:1034:11: error: ‘__clockid_t’ has not been declared
           __clockid_t __clock_id)
           ^~~~~~~~~~~
/usr/include/pthread.h:1129:7: error: ‘__clockid_t’ has not been declared
       __clockid_t *__clock_id)
       ^~~~~~~~~~~
In file included from /usr/include/c++/6/cstdlib:75:0,
                 from /usr/include/c++/6/ext/string_conversions.h:41,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/stdlib.h:100:8: error: ‘size_t’ does not name a type
 extern size_t __ctype_get_mb_cur_max (void) __THROW __wur;
        ^~~~~~
In file included from /usr/include/stdlib.h:275:0,
                 from /usr/include/c++/6/cstdlib:75,
                 from /usr/include/c++/6/ext/string_conversions.h:41,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/sys/types.h:33:9: error: ‘__u_char’ does not name a type
 typedef __u_char u_char;
         ^~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:34:9: error: ‘__u_short’ does not name a type
 typedef __u_short u_short;
         ^~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:35:9: error: ‘__u_int’ does not name a type
 typedef __u_int u_int;
         ^~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:36:9: error: ‘__u_long’ does not name a type
 typedef __u_long u_long;
         ^~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:37:9: error: ‘__quad_t’ does not name a type
 typedef __quad_t quad_t;
         ^~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:38:9: error: ‘__u_quad_t’ does not name a type
 typedef __u_quad_t u_quad_t;
         ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:39:9: error: ‘__fsid_t’ does not name a type
 typedef __fsid_t fsid_t;
         ^~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:44:9: error: ‘__loff_t’ does not name a type
 typedef __loff_t loff_t;
         ^~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:60:9: error: ‘__dev_t’ does not name a type
 typedef __dev_t dev_t;
         ^~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:70:9: error: ‘__mode_t’ does not name a type
 typedef __mode_t mode_t;
         ^~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:75:9: error: ‘__nlink_t’ does not name a type
 typedef __nlink_t nlink_t;
         ^~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:115:9: error: ‘__daddr_t’ does not name a type
 typedef __daddr_t daddr_t;
         ^~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:116:9: error: ‘__caddr_t’ does not name a type
 typedef __caddr_t caddr_t;
         ^~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:122:9: error: ‘__key_t’ does not name a type
 typedef __key_t key_t;
         ^~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:140:9: error: ‘__suseconds_t’ does not name a type
 typedef __suseconds_t suseconds_t;
         ^~~~~~~~~~~~~
In file included from /usr/include/stdlib.h:275:0,
                 from /usr/include/c++/6/cstdlib:75,
                 from /usr/include/c++/6/ext/string_conversions.h:41,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/sys/types.h:228:9: error: ‘__blksize_t’ does not name a type
 typedef __blksize_t blksize_t;
         ^~~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:235:9: error: ‘__blkcnt_t’ does not name a type
 typedef __blkcnt_t blkcnt_t;  /* Type to count number of disk blocks.  */
         ^~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:239:9: error: ‘__fsblkcnt_t’ does not name a type
 typedef __fsblkcnt_t fsblkcnt_t; /* Type to count file system blocks.  */
         ^~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:243:9: error: ‘__fsfilcnt_t’ does not name a type
 typedef __fsfilcnt_t fsfilcnt_t; /* Type to count file system inodes.  */
         ^~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:262:9: error: ‘__blkcnt64_t’ does not name a type
 typedef __blkcnt64_t blkcnt64_t;     /* Type to count number of disk blocks. */
         ^~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:263:9: error: ‘__fsblkcnt64_t’ does not name a type
 typedef __fsblkcnt64_t fsblkcnt64_t; /* Type to count file system blocks.  */
         ^~~~~~~~~~~~~~
/usr/include/x86_64-linux-gnu/sys/types.h:264:9: error: ‘__fsfilcnt64_t’ does not name a type
 typedef __fsfilcnt64_t fsfilcnt64_t; /* Type to count file system inodes.  */
         ^~~~~~~~~~~~~~
In file included from /usr/include/c++/6/cstdlib:75:0,
                 from /usr/include/c++/6/ext/string_conversions.h:41,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/stdlib.h:292:4: error: ‘size_t’ has not been declared
    size_t __statelen) __THROW __nonnull ((2));
    ^~~~~~
/usr/include/stdlib.h:322:4: error: ‘size_t’ has not been declared
    size_t __statelen,
    ^~~~~~
/usr/include/stdlib.h:427:22: error: ‘size_t’ was not declared in this scope
 extern void *malloc (size_t __size) __THROW __attribute_malloc__ __wur;
                      ^~~~~~
/usr/include/stdlib.h:427:22: note: suggested alternatives:
In file included from /usr/include/c++/6/iosfwd:38:0,
                 from /usr/include/c++/6/ios:38,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/c++/6/bits/c++config.h:201:26: note:   ‘std::size_t’
   typedef __SIZE_TYPE__  size_t;
                          ^~~~~~
/usr/include/x86_64-linux-gnu/c++/6/bits/c++config.h:201:26: note:   ‘std::size_t’
In file included from /usr/include/c++/6/cstdlib:75:0,
                 from /usr/include/c++/6/ext/string_conversions.h:41,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/stdlib.h:429:22: error: ‘size_t’ was not declared in this scope
 extern void *calloc (size_t __nmemb, size_t __size)
                      ^~~~~~
/usr/include/stdlib.h:429:22: note: suggested alternatives:
In file included from /usr/include/c++/6/iosfwd:38:0,
                 from /usr/include/c++/6/ios:38,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/c++/6/bits/c++config.h:201:26: note:   ‘std::size_t’
   typedef __SIZE_TYPE__  size_t;
                          ^~~~~~
/usr/include/x86_64-linux-gnu/c++/6/bits/c++config.h:201:26: note:   ‘std::size_t’
In file included from /usr/include/c++/6/cstdlib:75:0,
                 from /usr/include/c++/6/ext/string_conversions.h:41,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/stdlib.h:429:38: error: ‘size_t’ was not declared in this scope
 extern void *calloc (size_t __nmemb, size_t __size)
                                      ^~~~~~
/usr/include/stdlib.h:429:38: note: suggested alternatives:
In file included from /usr/include/c++/6/iosfwd:38:0,
                 from /usr/include/c++/6/ios:38,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/c++/6/bits/c++config.h:201:26: note:   ‘std::size_t’
   typedef __SIZE_TYPE__  size_t;
                          ^~~~~~
/usr/include/x86_64-linux-gnu/c++/6/bits/c++config.h:201:26: note:   ‘std::size_t’
In file included from /usr/include/c++/6/cstdlib:75:0,
                 from /usr/include/c++/6/ext/string_conversions.h:41,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/stdlib.h:429:51: error: expression list treated as compound expression in initializer [-fpermissive]
 extern void *calloc (size_t __nmemb, size_t __size)
                                                   ^
/usr/include/stdlib.h:441:36: error: ‘size_t’ has not been declared
 extern void *realloc (void *__ptr, size_t __size)
                                    ^~~~~~
In file included from /usr/include/stdlib.h:453:0,
                 from /usr/include/c++/6/cstdlib:75,
                 from /usr/include/c++/6/ext/string_conversions.h:41,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/alloca.h:32:22: error: ‘size_t’ was not declared in this scope
 extern void *alloca (size_t __size) __THROW;
                      ^~~~~~
/usr/include/alloca.h:32:22: note: suggested alternatives:
In file included from /usr/include/c++/6/iosfwd:38:0,
                 from /usr/include/c++/6/ios:38,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/x86_64-linux-gnu/c++/6/bits/c++config.h:201:26: note:   ‘std::size_t’
   typedef __SIZE_TYPE__  size_t;
                          ^~~~~~
/usr/include/x86_64-linux-gnu/c++/6/bits/c++config.h:201:26: note:   ‘std::size_t’
In file included from /usr/include/c++/6/cstdlib:75:0,
                 from /usr/include/c++/6/ext/string_conversions.h:41,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/istream:38,
                 from /usr/include/c++/6/sstream:38,
                 from prog.cpp:6:
/usr/include/stdlib.h:459:22: error: ‘size_t’ was not declared in this scope
 extern void *valloc (size_t __size) __THROW __attribute_malloc__ __wur;
                      ^~~~~~
/usr/include/stdlib.h:459:22: note: suggested alternatives:
In file included from /usr/include/c++/6/iosfwd:38:0,
                 from /usr/include/c++/6/ios:38,
               

Standard output is empty