Factorial
Calculates the factorial of a number.
- Use recursion.
- If
num
is less than or equal to1
, return1
. - Otherwise, return the product of
num
and the factorial ofnum - 1
. - Throws an exception if
num
is a negative or a floating point number.
def factorial(num): if not ((num >= 0) and (num % 1 == 0)): raise Exception("Number can't be floating point or negative.") return 1 if num == 0 else num * factorial(num - 1) factorial(6) # 720