Write a Prolog program to find factorial of a given number

Aim: Write a Prolog program to find factorial of a given number.

Prolog Program Code:

predicates
    fact(integer,integer)
    fact(integer)
clauses
	fact(0,X):-X=1.
	fact(N,X):-NN=N-1,fact(NN,X1),X=X1*N.
fact(N):-fact(N,X),write(X).

    

Output:

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