Question

Write a Prolog program to calculate the factorial of a number

Answer 1

factorial(0, 1).

factorial(N, Result) :-

    N > 0,

    N1 is N - 1,

    factorial(N1, Result1),

    Result is N * Result1.

 

 

 

You can use this Prolog program to calculate the factorial of a number by calling factorial(N, Result), where N is the number whose factorial you want to calculate, and Result will be unified with the factorial result. For example:

 

?- factorial(5, Result).

Result = 120.