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1.3 Header Files

A header file is a file containing C declarations and macro definitions (see section 1.4 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'.

1.3.1 Uses of Header Files		What header files are used for.
1.3.2 The `#include' Directive		How to write `#include' directives.
1.3.3 How `#include' Works		What `#include' does.
1.3.4 Once-Only Include Files		Preventing multiple inclusion of one header file.
1.3.5 Inheritance and Header Files		Including one header file in another header file.