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FACT1.PRO
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1987-10-21
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294b
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20 lines
/* FACT1.PRO */
/* Recursive program to compute factorials.
This is not tail recursive. */
PREDICATES
factorial(integer,real)
CLAUSES
factorial(1,1).
factorial(X,FactX) :-
X > 1,
Y = X-1,
factorial(Y,FactY),
FactX = X*FactY.