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Python : Find Factorial of Number Using Recursion

Tutorial by:Rizwan Abdullah      Date: 2016-06-16 01:52:11

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The factorial of a number is the product of all the integers from 1 to that number. For example, the factorial of 6 (denoted as 6!) is 1*2*3*4*5*6 = 720. Factorial is not defined for negative numbers and the factorial of zero is one, 0! = 1.

Source Code

# Python program to find the factorial of a number using recursion

def recur_factorial(n):
   """Function to return the factorial
   of a number using recursion"""
   if n == 1:
       return n
       return n*recur_factorial(n-1)

# take input from the user
num = int(input("Enter a number: "))

# check is the number is negative
if num < 0:
   print("Sorry, factorial does not exist for negative numbers")
elif num == 0:
   print("The factorial of 0 is 1")
   print("The factorial of",num,"is",recur_factorial(num))

Output 1

Enter a number: -2
Sorry, factorial does not exist for negative numbers



Output 2

Enter a number: 7
The factorial of 7 is 5040

Here, we ask the user for a number and use recursive function recur_factorial() to compute the product up to that number.

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