Header files typically have a “.h” or “.hpp” extension. They contain function prototypes, class declarations, and other essential declarations. Creating a Header File Open Your Text Editor Use a text ...

Once the #include us pre-processed it's all part of the same file, remember.<BR><BR>*well actually even variable declations would be executable, particularly in the case of C++ c-tors.

Basically once you've put a using namespace std; in your header, and someone has included your header, there's no way to undo the using. This can reduce your options when a name conflict occurs.

Reading and writing to a file is one of the most required features of any standard library for a language or an OS API. Many times I've used different methods to perform IO, but I haven't got a chance ...