Science Fair Project Encyclopedia
Visual Prolog, also formerly known as PDC Prolog and Turbo Prolog. Visual Prolog is a strongly-typed object-oriented extension of Prolog. As Turbo Prolog it was marketed by Borland, but it is now developed and marketed by the Danish firm Prolog Development Center (PDC) that originally produced it.
Visual Prolog is compiled rather than interpreted, as is traditional for logic languagues.
class hanoi predicates hanoi : (unsigned N). end class hanoi implement hanoi domains pole = string. clauses hanoi(N) :- move(N, "left", "centre", "right"). class predicates move : (unsigned N, pole A, pole B, pole C). clauses move(0, _, _, _) :- !. move(N, A, B, C) :- move(N-1, A, C, B), stdio::writef("move a disc from % pole to the % pole\n", A, B), move(N-1, C, B, A). end implement hanoi goal console::init(), hanoi::hanoi(4).
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