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Annotation of coherent/a/usr/man/ALL/_23ifndef, revision 1.1

1.1     ! root        1: 
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        !             3: #ifndef              Preprocessing Directive              #ifndef
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        !             8: Include code conditionally
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        !            11: The preprocessing directive #ifndef checks whether identifier has
        !            12: been defined as a macro name.  If identifier has _n_o_t been defined
        !            13: as  a macro,  then  the preprocessor  includes  group within  the
        !            14: program, up  to the next  #elif, #else, or  #endif directive.  If
        !            15: identifier has been defined, however, then group is skipped.
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        !            17: An  #ifndef directive  can  be followed  by any  number of  #elif
        !            18: directives, by one #else directive, and by one #elif directive.
        !            19: 
        !            20: ***** See Also *****
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        !            22: #elif, #else, #endif, #if, #ifndef, C preprocessor, defined
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        !            64: COHERENT Lexicon                                           Page 1
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