29 lines
1.0 KiB
Racket
29 lines
1.0 KiB
Racket
#lang typed/racket
|
|
|
|
;; (C) Copyright Collin Doering 2013
|
|
;;
|
|
;; This program is free software: you can redistribute it and/or modify
|
|
;; it under the terms of the GNU General Public License as published by
|
|
;; the Free Software Foundation, either version 3 of the License, or
|
|
;; (at your option) any later version.
|
|
;;
|
|
;; This program is distributed in the hope that it will be useful,
|
|
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;; GNU General Public License for more details.
|
|
;;
|
|
;; You should have received a copy of the GNU General Public License
|
|
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
;; File: rdm-typed.rkt
|
|
;; Author: Collin J. Doering <rekahsoft@gmail.com>
|
|
;; Date: Jul 2, 2013
|
|
|
|
(: factorial : Integer -> Integer)
|
|
(define (factorial n)
|
|
(: factorial-helper : Integer Integer -> Integer)
|
|
(define (factorial-helper n acc)
|
|
(cond [(<= n 1) acc]
|
|
[else (factorial-helper (- n 1) (* acc n))]))
|
|
(factorial-helper n 1))
|