Write a Program to calculate factorial of a number using recursion.

Solution

def factorial(n):
    if n == 0 or n == 1:
        return 1
    else:
        return n * factorial(n - 1)

num = int(input("Enter a number: "))

if num < 0:
    print("Factorial is not defined for negative numbers.")
else:
    print("Factorial of", num, "is:", factorial(num))

Output

Enter a number: 5

Factorial of 5 is: 120

Programming Examples

Write a Program to calculate factorial of a number using recursion.