Write factorial with while loop python

Question

I want to write a program that can calculate the factorial of a number. Can I use if-else statements? Something like this:

num = ...

factorial = 1

if num < 0:

   print("must be positive")

elif num == 0:

   print("factorial = 1")

else:

   for i in range(1,num + 1):

       factorial = factorial*i

   print(num, factorial)

And also I want to use the while loop. How can I use that?

Answer 1

You can use the below code for calculating the factorial of the number:

while num > 1:

    factorial = factorial * num

    num = num - 1

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