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Chapter 10: Functions and Subroutines – Reusing Code. Page 149

1! is 1
2! is 2
3! is 6
4! is 24
5! is 120
6! is 720
7! is 5040
8! is 40320
9! is 362880
10! is 3628800

4. A recursive function is a special type of function that calls itself.
Knowing that n! = n * (n-1)! and that 0! = 1 rewrite #3 to use a
recursive function to calculate a factorial.

© 2019 James M. Reneau (CC BY-NC-SA 3.0 US)