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#include<iostream>
#include<string.h>
#include<fstream>
using namespace std;
char encryptpass(char *pass) //function to encrypt 
 {
 
   for( int i=0; pass[i] != '\0'; ++i )
   char enpass[10]= ++pass[i];
   return(enpass);
 
 
}
 char decryptpass(char *str)  // function to decrypt
{
for( ; str!='\0'; ++str )
char depass[10]= --str;
return(depass);
 
}
 
 int main()             // main function
{
int flag=0;
if(flag=0)
{
    cout<<"enter your password";
    char pass[10];
    cin>>pass;
    fstream file("userpass.txt",ios::in | ios::out);
    file<<enpass[10];
}
else
{
  cout<<"enter password";
  cin>>pass;
   bool check=false;
   static char str[10];
   file.seekg(ios::beg);
   file >> str;
   file.close();
   decryptpass(str);
 
     if(pass=depass)   // decrypted password is equal to input password ?
   {
       check=true;      // set boolen value to true
   }
 else
 {
   cout<<"incorrect password";
 }
   return(0);
 }    // end of main

prog.cpp: In function 'char encryptpass(char*)':
prog.cpp:10:29: error: array must be initialized with a brace-enclosed initializer
    char enpass[10]= ++pass[i];
                             ^
prog.cpp:11:11: error: 'enpass' was not declared in this scope
    return(enpass);
           ^
prog.cpp: In function 'char decryptpass(char*)':
prog.cpp:18:20: error: array must be initialized with a brace-enclosed initializer
 char depass[10]= --str;
                    ^
prog.cpp:19:8: error: 'depass' was not declared in this scope
 return(depass);
        ^
prog.cpp: In function 'int main()':
prog.cpp:32:11: error: 'enpass' was not declared in this scope
     file<<enpass[10];
           ^
prog.cpp:37:8: error: 'pass' was not declared in this scope
   cin>>pass;
        ^
prog.cpp:40:4: error: 'file' was not declared in this scope
    file.seekg(ios::beg);
    ^
prog.cpp:45:14: error: 'depass' was not declared in this scope
      if(pass=depass)   // decrypted password is equal to input password ?
              ^
prog.cpp:54:2: error: expected '}' at end of input
  }    // end of main
  ^

Standard output is empty