Python Program to Find the Factorial of a Number

What is factorial?

Factorial is a non-negative integer. It is the product of all positive integers less than or equal to that number for which you ask for factorial. It is denoted by exclamation sign (!).

For example:

The factorial value of 4 is 24.

Note: The factorial value of 0 is 1 always. (Rule violation)

See this example:

num = int(input("Enter a number: "))
factorial = 1
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)

The following example displays the factorial of 5 and -5.

Output:

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