My question is plain simple ... how to work with the debugger and how to find out what`s the bug...? I`ve been using it blindly and...I get no response...I get an Illegal Operation and I wanna fix it ...where do I find tutorial(s) and if you can give some tip(s) ?

what compiler/debugger are you using?

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i`m using MSVC++ 6 and I found out what`s the bug : an unhandled exception on a "acos" func call...pretty stupid...it worked just fine up until now...At almots every aplication I run on my computer(Windows) at exit it pops an Illegal Operation...I`m thinking that my OS is the fault...