Python Program to Find Factorial of Number Using Recursion

In this example, we will write a program that calculates factorial of a number using a recursive function in Python. To better understand this example, make sure you have knowledge of the following tutorials:-

Factorial of a number specifies a product of all integers from 1 to that number. It is defined by the symbol exclamation mark (!).

Python Program to Find Factorial of Number Using Recursion

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

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

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

The output of the above program is:-

Enter a number: 5
The factorial of 5 is 120
Program Explanation:-
The calculation of factorial can be achieved using recursion in python. Here, a function factorial is defined which is a recursive function that takes a number as an argument and returns n if n is equal to 1 or returns n times factorial of n-1. A number is taken as an input from the user and its factorial is displayed in the console.