Python Program to Find The Factorial of an Input Number

Python Program to Find The Factorial of an Input Number: In this program, we will learn to write a code to check the factorial of an input number.

In this program we use:

• if-else statement
• for loop

Working:

• Factorial is the product of integer from 1 to the given number.
• Factorial is not defined for negative integers.
• Factorial of zero is always 1 (0!=1).

Source Code:

print("           Scribbled Writer.")

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)

print("            Happy Coding!")   

---

Output:

Ex-1:

           Scribbled Writer.

Enter a number: 17

The factorial of 17 is 355687428096000

            Happy Coding!

Ex-2:

           Scribbled Writer.

Enter a number: -3

Sorry, factorial does not exist for negative numbers.

            Happy Coding!

Ex-3:

           Scribbled Writer.

Enter a number: 0

The factorial of 0 is 1

            Happy Coding!

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