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Expand file tree Collapse file tree Original file line number Diff line number Diff line change 1- """Python program to find the factorial of a number provided by the user."""
1+ def factorial (input_number : int ) -> int :
2+ """
3+ Non-recursive algorithm of finding factorial of the
4+ input number.
5+ >>> factorial(1)
6+ 1
7+ >>> factorial(6)
8+ 720
9+ >>> factorial(0)
10+ 1
11+ """
212
3- # change the value for a different result
4- NUM = 10
5-
6- # uncomment to take input from the user
7- # num = int(input("Enter a number: "))
8-
9- FACTORIAL = 1
10-
11- # check if the number is negative, positive or zero
12- if NUM < 0 :
13- print ("Sorry, factorial does not exist for negative numbers" )
14- elif NUM == 0 :
15- print ("The factorial of 0 is 1" )
16- else :
17- for i in range (1 , NUM + 1 ):
18- FACTORIAL = FACTORIAL * i
19- print ("The factorial of" , NUM , "is" , FACTORIAL )
13+ if input_number < 0 :
14+ raise ValueError ('Input input_number should be non-negative' )
15+ elif input_number == 0 :
16+ return 1
17+ else :
18+ result = 1
19+ for i in range (input_number ):
20+ result = result * (i + 1 )
21+ return result
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