As promised, here is the source code for my connect-four game using simple C++.
The algorithms were a little tough to plan out at first without physically mapping every possible winning combination, but I managed by writing just four for loops.
Obviously, the above section is just a tiny part of the code. Check out the full code on pastebin. It's only 171 lines of code, which I was expecting to be much more. I haven't implemented AI yet, but I'll be able to soon enough. I'm going to backup this project and start a new one to start working things out. If anybody has any questions or bug reports (shouldn't really be many, but I know that's not too realistic) please write to me.
Note: This was written in Mac OSX, so it uses "system("clear")" to clear the screen. If you are running Windows or Linux, go to the "clearScreen" method in the source code and change that to whatever your native environment uses to clear the screen!