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#include <iostream>
#include <vector>
#include <fstream>
 
std::vector<float>vfdata;
int inumber=0;
int t_1=0;
 
void write(void);
 
void main()
{        
  read(pipe1[0], & smsg, sizeof(S_DATA));
  inumber=smsg.data[0];
 
  while (1){
    read(pipe1[0], & smsg, sizeof(S_DATA));
 
    if(smsg.data[0]){                
      vfdata.push_back(smsg.data[1]); 
      vfdata.push_back(smsg.data[2]);
      vfdata.push_back(smsg.data[3]);
      vfdata.push_back(smsg.data[4]);
      vfdata.push_back(smsg.data[5]);                    
      t_1++;                     
    }
    if(t_1==inumber){
      write();
    }
  }
 
}
 
void write(void)
{
  ofstream write(" Path/Data.txt", std::ofstream::app);
  if (write.is_open()){
    for (int i=0; i<vfdata.size(); i++){
      write<<vfdata[i];
    }
    write.close(); 
  }
 
void write(void);

prog.cpp:11:11: error: ‘::main’ must return ‘int’
 void main()
           ^
prog.cpp: In function ‘int main()’:
prog.cpp:13:8: error: ‘pipe1’ was not declared in this scope
   read(pipe1[0], & smsg, sizeof(S_DATA));
        ^
prog.cpp:13:20: error: ‘smsg’ was not declared in this scope
   read(pipe1[0], & smsg, sizeof(S_DATA));
                    ^
prog.cpp:13:33: error: ‘S_DATA’ was not declared in this scope
   read(pipe1[0], & smsg, sizeof(S_DATA));
                                 ^
prog.cpp:13:40: error: ‘read’ was not declared in this scope
   read(pipe1[0], & smsg, sizeof(S_DATA));
                                        ^
prog.cpp: In function ‘void write()’:
prog.cpp:36:3: error: ‘ofstream’ was not declared in this scope
   ofstream write(" Path/Data.txt", std::ofstream::app);
   ^
prog.cpp:36:3: note: suggested alternative:
In file included from /usr/include/c++/4.8/ios:38:0,
                 from /usr/include/c++/4.8/ostream:38,
                 from /usr/include/c++/4.8/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/4.8/iosfwd:160:34: note:   ‘std::ofstream’
   typedef basic_ofstream<char>   ofstream;
                                  ^
prog.cpp:36:12: error: expected ‘;’ before ‘write’
   ofstream write(" Path/Data.txt", std::ofstream::app);
            ^
prog.cpp:37:13: error: request for member ‘is_open’ in ‘write’, which is of non-class type ‘void()’
   if (write.is_open()){
             ^
prog.cpp:38:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i=0; i<vfdata.size(); i++){
                                 ^
prog.cpp:39:22: error: invalid operands of types ‘void()’ and ‘__gnu_cxx::__alloc_traits<std::allocator<float> >::value_type {aka float}’ to binary ‘operator<<’
       write<<vfdata[i];
                      ^
prog.cpp:41:11: error: request for member ‘close’ in ‘write’, which is of non-class type ‘void()’
     write.close(); 
           ^
prog.cpp:44:17: error: expected ‘}’ at end of input
 void write(void);
                 ^

Standard output is empty