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Alright, that fixed it. The headers were the problem, it seems. Thanks again.

Many thanks for the quick replies. I admit I did the header guards in a bit of a hurry, so I will check into that.
I've understood the idea of passing the parameter by reference, and I agree with...

I'll try to be brief. I have several classes in my program, and now I'm having trouble making them work together. The details: I have classes Ball (Ball.cpp + Ball.h) and Wall (Wall.cpp + Wall.h). I...