Ex.No5 Factorial.md

Ex.No: 5 Logic Programming – Factorial of number

DATE: 09.03.2024

REGISTER NUMBER : 212222060295

AIM:

To write a logic program for finding the factorial of given number using SWI-PROLOG.

Algorithm:

1. STEP 1: Start the program
2. STEP 2: Write a rules for finding factorial of given program in SWI-PROLOG.
3. a) factorial of 0 is 1 => written as factorial(0,1).
4. b) factorial of number greater than 0 obtained by recursively calling the factorial function.
5. STEP 3: Run the program to find answer of query.
6. STEP 4: Stop the program.

Program:

factorial(0,1).
factorial(A,B):-  
           A > 0, 
           C is A-1,
           factorial(C,D),
           B is A*D.

Output:

Result:

Thus the factorial of given number was found by logic programming.