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Prolog Source  |  1990-03-26  |  213 b   |  11 lines
  1. /*
  2.    Copyright (c) 1986, 90 by Prolog Development Center
  3. */
  4.  
  5. predicates
  6.    classify(integer, symbol)
  7.  
  8. clauses
  9.    classify(0, zero).
  10.    classify(X, negative) :- X < 0.
  11.    classify(X, positive) :- X > 0.