Python Program to Find Factorial of Number Using Loop

Here you will get python program to find factorial of number using for and while loop.

Factorial of a number is calculated by multiplying it with all the numbers below it starting from 1.

For example factorial of 4 is 24 (1 x 2 x 3 x 4).

Below program takes a number from user as an input and find its factorial.

Python Program to Find Factorial of Number

Using For Loop

Output

enter a number: 5
factorial of 5 is 120

Using While Loop

Output

enter a number: 4
factorial of 4 is 24

Comment below if you have any queries related to above python factorial program.

5 thoughts on “Python Program to Find Factorial of Number Using Loop

    1. Admin Post author

      Because range(start, end) function will generate numbers from start and end-1. In above program we want to generate numbers from 1 to num, I have used num+1 that means (num+1)-1 which ultimately means num.

      Reply
  1. deepak

    def factorial(a):
    result=1
    for i in range(1,a+1):
    result= result*i
    return result
    a = input(‘ur number please ‘)
    y = (factorial(a))
    print(y + str (‘is ur answer’))
    can any body tell me where is the problem

    Reply
  2. sven Brodowski

    Hi
    i’m Sven Brodowski
    my english is not verry good

    youre programms are super
    I’m learning Python and Java

    my Questions
    have you got a programm in Python
    where can do inverse Matrix

    I live in heilbronn germanny

    ok see you later

    Reply
  3. Paula Odell

    Hello!

    I have read my book from Codio and have attempted the challenge. Here is what I have coded:

    # Get N from the command line
    import sys
    N = int(sys.argv[1])

    # Your code goes here
    N!=N*(N-1)*(N-2)*(N-3)*(N-4)*1
    print (N)

    It is telling me my output is 4.
    I am confused, because if N is 4 based upon what the user input, why is it not completing the calculation?

    Can you help?

    Reply

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