How to create a text file with filename based on user in C++ language?

[kledde0909]

How can I create a program that creates a text file based on user? Thanks for the answers.

[lastchance]

I doubt that you can do it in a portable manner. You might be able to do it if one of your environment variables contains your username. This worked for me in Windows 7.

#include <iostream>
#include <cstring>
#include <fstream>
#include <cstdlib>      // for getenv
using namespace std;

int main()
{
   string extension = ".txt";
   string user = getenv( "USERNAME" );

   string filename = user + extension;

   ofstream out( filename );
   if ( out )
   {
      cout << "Created file " << filename << '\n';
      out << "Hello, " << user << '\n';
   }
   else
   {
      cout << "boo!\n";
   }
}

[nuderobmonkey]

At unixoid systems line 10 should be:
string user = getenv( "USER" );

So lastchance's program could be made os independent by:

#include <iostream>
#include <cstring>
#include <fstream>
#include <cstdlib>      // for getenv
using namespace std;

int main()
{
   string extension = ".txt";
   string user = getenv( "USERNAME" );
   if( user.empty())
      user = getenv( "USER" );

   string filename = user + extension;

   ofstream out( filename );
   if ( out )
   {
      cout << "Created file " << filename << '\n';
      out << "Hello, " << user << '\n';
   }
   else
   {
      cout << "boo!\n";
   }
}