(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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