Python Program to find Factorial of a Number | Code Star

In this article, you'll learn to find the factorial of a number and display it.

Before you move on, you should have a basic idea of Python .

Some articles related to Python to check out:

• Hello World Program
• Python Interpreted or Compiled
• Decorate text in Python
• Text Editor using Python

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What is a factorial in Python?

Factorial of a number means the product of all the whole numbers preceding the number.

Ex: Factorial of 5= 1*2*3*4*5=120

Factorial is not defined for negative numbers, and the factorial of zero is one, 0! = 1.

So, today we are finding this product or Factorial of a number using Python.

Program to find Factorial of a number in Python

Source Code:

# Python program to find the factorial of a number provided by the user.

# change the value for a different result

num = 7

# To take input from the user

#num = int(input("Enter a number: "))

factorial = 1

# check if the number is negative, positive or zero

if num < 0:

   print("Sorry, factorial does not exist for negative numbers")

elif num == 0:

   print("The factorial of 0 is 1")

else:

   for i in range(1,num + 1):

       factorial = factorial*i

   print("The factorial of",num,"is",factorial)

Output

The factorial of 7 is 5040

Note: To test the program for a different number, change the value of num.

Here, the number whose factorial is to be found is stored in num, and we check if the number is negative, zero or positive using if...elif...else statement. If the number is positive, we use for loop and range() function to calculate the factorial.