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Annotation of coherent/a/usr/man/ALL/_23ifdef, revision 1.1.1.1

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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.
                     24: 
                     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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