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Download(c) 2005-2025 XLOG Technologies AG
/**
* Prolog code for the tak function benchmark.
*
* McCarthys tak function.
* Modification of the tarai function from Takeuchi.
*
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*
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*
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*/
% fun(+Integer, +Integer, +Integer, -Integer)
fun(X, Y, Z, A) :-
X =< Y, !,
Z = A.
fun(X, Y, Z, A) :-
X1 is X - 1,
fun(X1, Y, Z, A1),
Y1 is Y - 1,
fun(Y1, Z, X, A2),
Z1 is Z - 1,
fun(Z1, X, Y, A3),
fun(A1, A2, A3, A).
% mtak
mtak :-
fun(18, 12, 6, _).