Ok, this is my problem. My friend sent me his game (C Source) he had to make for uni: Poker. He compiled in Linux, don't know what he used. Anywayz I compiled it in windows using dev c++. The problem is that it doesn't work on my computer, like the validation doesn't work, like if u enter a wrong input, it still goes through etc...Please ask anything in relation to being more specific if i haven't made myself clear enough. I can provide the source code if needed