As I stated in the previous post: I have looked through the code several times, and I cannot spot the problem. I think it may be a logical error, but as far as I can tell, there is none. Seeing as I am not in a c++ class and do not have anyone else to refer to (I ran this by my friend and he didn't spot any errors either), will anyone give me some suggestions as to how to go about debugging this, or tell me if there is a logical error in my method of solving?

Again: the program does not crash, but it never passes the last if statement of "if(correctnum==true)" even when I know there are several places on the grid where it should.

Thanks for the help and I hope to get better at debugging.