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1.1 ! root 1: ! 2: ! 3: manifest constant Definition manifest constant ! 4: ! 5: ! 6: ! 7: ! 8: A manifest constant is a numeric constant that is given a name so ! 9: it can be defined differently under different computing environ- ! 10: ments. An example is EOF, the end-of-file marker, which has ! 11: wildly different representations under different operating sys- ! 12: tems. Note, too, that numerals are manifest constants by defini- ! 13: tion. ! 14: ! 15: The use of manifest constants in programs helps to ensure that ! 16: code is portable by isolating the definition of these elements in ! 17: a single header file, where they need to be changed only once. ! 18: ! 19: ***** See Also ***** ! 20: ! 21: #define, definitions, NULL, portability ! 22: ! 23: ! 24: ! 25: ! 26: ! 27: ! 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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