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Annotation of coherent/a/usr/man/ALL/_23if, revision 1.1.1.1

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                      3: #if                  Preprocessing Directive                  #if
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                      8: Include code conditionally
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                     11: The preprocessing  directive #if  tells the preprocessor  that if
                     12: constant-expression is  true (i.e., that  it evalutes to  a value
                     13: other than zero), then include the following lines of code within
                     14: the  program until  it  reads the  next #elif,  #else, or  #endif
                     15: directive.
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                     17: The constant-expression  must be  an integral expression,  and it
                     18: cannot include a sizeof  operator, a cast, or an enumeration con-
                     19: stant.  All macro  substitutions are performed upon the constant-
                     20: expression  before it  is evaluated.   All integer  constants are
                     21: treated as  long objects, and  are then evaluated.   If constant-
                     22: expression includes character constants, all escape sequences are
                     23: converted into characters before evaluation.
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                     25: ***** See Also *****
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                     27: #elif, #else, #endif, #ifdef, #ifndef, C preprocessor
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                     64: COHERENT Lexicon                                           Page 1
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