RosettaCodeData/Task/Conditional-structures/Prolog/conditional-structures-4.pro

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Prolog
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2015-11-18 06:14:39 +00:00
fact(X) :-
( X = bar -> write('You got me!'), nl
; write(X), write(' is not right!'), nl, fail ).
go :-
( fact(booger)
; fact(bar) ).