Correct C++ file extension [duplicate]

Question

Possible Duplicate:
Correct C++ code file extension? .cc vs .cpp
.c vs .cc vs. .cpp vs .hpp vs .h vs .cxx

I have written C++ code in files with extension .cpp, .cc or .cxx

Can anyone explain that what is the difference between these three and which one is the best ( is that platform dependent ) and why?

I am currently working on cygwin.

Answer 1

It's a matter of code conventions. These extensions are all interchangeable (as far as platforms are concerned). If you participate in an existing project, you should adhere to this project's conventions, otherwise just choose whatever you like.