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UGC NET CSE | June 2013 | Part 3 | Question: 67

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Which one of the following is the correct implementation of the meta-predicate “not” in PROLOG (Here G represents a goal)?

  1. not(G):- !, call(G), fail. not(G).
  2. not(G):- call(G), !, fail. not(G).
  3. not(G):- call(G), fail, !, not(G).
  4. not(G):- call(G), !, fail.not(G):- !.
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