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The GNU C Preprocessor

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Header Files

Header files can contain C declarations and macro definitions that are to be shared by more than one source file. You request the inclusion of a header file in a source file by using the C preprocessor command #include (or more typically in the Mac OS X environment, the Objective-C preprocessor command #import ).

Uses of Header Files

The #include Command

Multiple Inclusion of Header Files


The GNU C Preprocessor

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