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Annotation of coherent/a/usr/man/ALL/_23ifdef, revision 1.1

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        !             3: #ifdef               Preprocessing Directive               #ifdef
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        !             8: Include code conditionally
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        !            11: The preprocessing directive  #ifdef checks whether identifier has
        !            12: been defined as a macro  name.  If identifier has been defined as
        !            13: a macro, then the preprocessor includes group within the program,
        !            14: up to the next  #elif, #else, or #endif directive.  If identifier
        !            15: has not been defined, however, then group is skipped.
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        !            17: An #ifdef directive can be followed by any number of #elif direc-
        !            18: tives, by one #else directive,  and must be followed by an #endif
        !            19: directive.
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        !            21: ***** Example *****
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        !            23: For an example of using this directive in a program, see assert.
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        !            25: ***** See Also *****
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        !            27: #elif, #else, #endif, #if, #ifndef, C preprocessor
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        !            64: COHERENT Lexicon                                           Page 1
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