You can pass arguments on the command-line to your program

Code:
int main (int argc, char **argv)
{
    int retval;

    return retval;
}
Variable argc is the number of parameters on the command-line. This value is at least 1, since the name of the program is the first parameter. The variable argv points to the list of arguments.

>I have Microsoft Visual C++ 6.0 Enterprise.

And that's running under DOS?