>I don't agree with U.
You can disagree all you want, but you're still wrong.

>u can search "fflush" in MSDN!
MSDN doesn't define the standard library, the C standard does. And the C standard says that calling fflush on an input stream is undefined. If your compiler happens to support an extension that allows fflush(stdin) , feel free to use it. But until this forum is renamed to "C for Beair.GQ's compiler", you'll be promptly corrected if you try to encourage undefined behavior with constructs like that.

>and it's give the example like this:
MSDN's examples are well known to be examples of what not to do. The code you posted is broken in four places, has three instances of non-portable constructs, and three instances of non-portable usage. Using MSDN to back up your claims is a folly.

hoho,I am sorry for my naive.
i am chinese,what i want is learning english,and make friends with whom i want.