Command Line User Input

I was wondering how to get a variable from user input from a command line, like seen in Borland C++ and other compilers. For example, you go to the command line and type "bcc32", and it gives you information about the program. But you type "bcc32 TestProgram.cpp" and it compiles TestProgram.cpp! How do I make it so the user can enter something like "TestProgram.cpp", and the program responds a certain way?

Thanks!
~Matt3000

Wait, wait - I know this one! - Woooo!!!!!
http://faq.cprogramming.com/cgi-bin/...&id=1043284392

I've been here over 5 years now and I finally get to answer a question - rejoice rejoice.