exercises in c++

hi all,
i'm new to c++ and although i'm able to do most of the basic things,i need some practice.thus,anybody know any site providing good c++ exercises (especially classes, structures, and general OOP stuff, which I really need to practice).
thanks

I think the best way to improve Your skills would be writing programs, maybe joining open source project instead doing exercises.

However if You don't mind algorithm related problems You can try:
http://acm.uva.es/problemset/
http://www.topcoder.com/

Well, algorithm related problems don't really have much to do with OOP.

An extremely popular exercise undertaken by many is making a simple game. Start with a console game first. Don't make it big and complex, but practice as much OOP as possible. The problem with an unrealistically huge and complex game is that you will never finish it.