Python Program to Find Factorial of Number Using Recursion

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Python Program to Find Factorial of Number Using Recursion
vinaykhatri

Vinay Khatri
Last updated on February 27, 2024

    Here in this article, we have provided a python source code, which asks the user to enter a number and in the output display its factorial. Here rather than using a Loop structure we have created this program using the recursive technique.

    Prerequisite Python Program to Find Factorial of Number Using Recursion

    • Python Input, Output
    • Python User-Defined Function
    • Python Recursion
    • Python if…else statement

    What is Factorial?

    A factorial of a number is the product of that number and all the integer numbers below it till 1. for instance, the 4 factorial would be 4*3*2*1 = 24 By default, the 0 and 1 factorial is 1.

    Steps:

    • First, ask the user to enter a number.
    • Create a recursive function which calls itself till the base condition get satisfied.
    • Here recursive logic would be num*function(n-1).

    Python Program to Find Factorial of Number Using Recursion

    Python Code

    def fact(num):
        if num == 1:
            return num
        else:
            #recursion
            return num*fact(num-1)
    
    print("-------------Factorial Calculator-------------------")
    num = int(input("Enter the Number: "))
    if num > 0:
        print(num,"!","is:", fact(num))
    elif num == 0:
        print("The 0! is 1")
    else:
        print("Enter a valid Number")

    Output 1:

    -------------Factorial Calculator-------------------  
    Enter the Number: 12
    12 ! is: 479001600

    Output 2:

    -------------Factorial Calculator-------------------
    Enter the Number: 7
    7 ! is: 5040

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