# Write a number that will calculate a factorial for that number
# Write two version of this program, one with a for loop and another with while loop
# The factorial of number 5 (the notation is 5!) is 1 * 2 * 3 * 4 * 5 = 120
### example ###
# program: Enter a number and I will calculate a factorial for you
# user: 6
# program: 6! is 720