how to get the value from cmd prompt to c++?

using c++ with command prompt codes... i wanna know how to get the value from cmd prompt to c++?

example i want to get the hostname:

char x;
x=system("FOR /F \"usebackq tokens=1\" %B IN (`hostname`) do echo %B"); :freak:

something like this...

 

Redirect the output to a file, then open the file after the system() command and read it.
Alternatively find out how to do this by using OS calls - that's how the shell does it.