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1.1 ! root 1: ! 2: ! 3: #if Preprocessing Directive #if ! 4: ! 5: ! 6: ! 7: ! 8: Include code conditionally ! 9: ! 10: ! 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. ! 16: ! 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. ! 24: ! 25: ***** See Also ***** ! 26: ! 27: #elif, #else, #endif, #ifdef, #ifndef, C preprocessor ! 28: ! 29: ! 30: ! 31: ! 32: ! 33: ! 34: ! 35: ! 36: ! 37: ! 38: ! 39: ! 40: ! 41: ! 42: ! 43: ! 44: ! 45: ! 46: ! 47: ! 48: ! 49: ! 50: ! 51: ! 52: ! 53: ! 54: ! 55: ! 56: ! 57: ! 58: ! 59: ! 60: ! 61: ! 62: ! 63: ! 64: COHERENT Lexicon Page 1 ! 65: ! 66:
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