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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.
- Preventing multiple inclusion of one header file.
- Including one header file in another header file.
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