How do i run a program from another program and pass data to it via stdin in c or c++?

Question

Say i have an exe, lets say sum.exe. Now say the code for sum.exe is

void main ()
{
 int a,b;
 scanf (\"%d%d\", &a, &b);
 printf (\"%d\", a+b);
}
         


        

Answer 1

It sounds like you're coming from a Windows environment, so this might not be the answer you are looking for, but from the command line you can use the pipe redirection operator '|' to redirect the stdout of one program to the stdin of another. http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/redirection.mspx?mfr=true

You're probably better off working in a bash shell, which you can get on Windows with cygwin http://cygwin.com/

Also, your example looks like a mix of C++ and C, and the declaration of main isn't exactly an accepted standard for either.