Lots and lots of things in C++ (and C for that matter) can lead to undefined behavior if preconditions are not met. Signed integer arithmetic is just one of many. If you're programming in this language, you should be used to dealing with narrow contracts.
So, no, they shouldn't be avoided. Deal with them depending on the situation, in many cases an assert will suffice. Pretending it's not a problem is fatal.
(and no, gcc isn't the only compiler that assumes that naive signed overflow checks are always false)
atof() is part of the standard C library that uses the general 'C' locale by default while stringstream is C++ which uses the current system locale by default. You can use the setlocale()[^] function to change the locale for the standard C library functions (pass an empty string to use the environment's default locale).
Am new to MFC.I have an MFC application that has to capture the device/system shut down using MFC window messages.I tried it with wm_close,wm_destroy,wm_endsession.But not able to capture.The fix should be like it has to work in xp/vista and Windows 8.0. Thanks in advance