(cpp.info)Header Files

Header Files
============

   A header file is a file containing C declarations and macro
definitions (Note: Macros.) to be shared between several source
files.  You request the use of a header file in your program with the C
preprocessor command `#include'.

Header Uses

What header files are used for.

Include Syntax

How to write `#include' commands.

Include Operation

What `#include' does.

Once-Only

Preventing multiple inclusion of one header file.

Inheritance

Including one header file in another header file.