(cpp) Header Files

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 Header Files
 ============
 
    A header file is a file containing C declarations and macro
 definitions ( Macros.) to be shared between several source
 files.  You request the use of a header file in your program with the C
 preprocessing directive `#include'.
 

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* Header Uses         What header files are used for.
* Include Syntax      How to write `#include' directives.
* 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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