I always wondered why the c++ headers don't have the .h endings? On the other side I see it very often that .h is used for everything else (like in the c++ class for the examples).
Some compilers (like the one used here) allow you to leave the .h off for standard headers, but you always have to write it for custom class files. I know Borland compiler and some others make you write it in full regardless.
The c++ header files do not need .h, you need it for C headers your including. For example time.h is the C version an ctime is the C++ "remake" of time.h (it is not necessarily changed).
