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Message: [QUOTE="Darren Grant, post: 1474215"] Ok, avoid friendship where you don't need, fair enough. Oh? "To add two (or more) vectors together, all you have to do is add the respective components together." "u + v = <u_x + v_x, u_y + v_y>" (from Tricks of the 3D Game Programming Gurus by Andre Lamothe). Similarly for subtraction. Scaling is done with multiplication by a scalar: if (r == 0) throw std::domain_error("divide by zero"); I guess this is personal preference. I got this idea from Design Patterns ([URL]http://www.amazon.com/exec/obidos/tg/detail/-/0201633612/102-9465371-[/URL] 5694567?v=glance) Ok, done. Oh, ok. Ok, changed. But then l is modified. Eg m / 2; // m is changed Cool, thanks very much for your help. I definately learned a lot. Regards, Darren [/QUOTE]