(cpp.info)Header Files


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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.

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