# Calculating the factorial of a number # This module calculates the factorial of the nonnegative integer 'n' # Written by Beth Mela # Last updated April 23, 2015 # Ask user to input a nonnegative integer n=int(input('Enter a nonnegative integer and this program will calculate its factorial:')) print('The number you entered is {}.'.format(n)) # Define constants factorial=1 # Ensure the number is valid and calculate the factorial if n<0: print('The number you have entered is not a nonnegative integer.') elif n==0: print('The factorial of 0 is 1.') else: for i in range(1,n+1): factorial=factorial*i print('The factorial of {} is {:,}.'.format(n,factorial)) # End module
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