The real answer is: if you're asking this sort of question, you shouldn't be using Eclipse yet.
That's not the answer you want, though. There's probably something wrong with the way you're doing it, but since we can't see what you're doing, there's no way to know what you're doing wrong. If you post the relevant code, someone will probably be able to help you out.
Ezzaral sir extremely thanks code is working perfectly.the reason i use eclipse is beacuse of case sensitive sir .if i use notepad each and everything i have to check .in eclipse if i give quickfix many errors get solved