I'm willing to make a little start for you:
There.Code:int main() { return 0; }
Seriously, though. You're afraid you're going to fail. Well, if you never studied the subject whatsoever, you should. This is the most basic stuff you're talking about, anyone with a remote hint of a brain should be able to do this within 5 minutes, knowing no C, with the links provided.
I am willing to help you a bit more though: You forgot to check the length of the input in your program. So it would still have false positives.