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7.2  File Inclusion

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As mentioned earlier in this text, it is frequently convenient to place a list of declarations of user-defined data types and functions (as well as #defined names) in a separate "header" file which may be accessed by various other source files.  This is accomplished with the FILE INCLUSION preprocessor directive, usually placed at the beginning of a source file.  Its syntax is one of:

    # include      <standard library header file>
    # include      "user-defined header file"

This directs the preprocessor to replace the '#include' line with all the text contained in the named file.  Using quotes instead of <> braces instructs the preprocessor to look for the file in the user's directory rather than that used by the system for standard header files.  For example, a source file using the printf() standard library function declared in the standard header 'stdio.h' and the user-defined type personnel_rec defined in the user's file 'personnel.h' should begin with:

    # include       <stdio.h>
    # include       "personnel.h"






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