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use inc/dec for factorial

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Pekka Laiho 2020-10-17 14:18:16 +07:00
parent 475ddf5a20
commit 94a69e7b76
1 changed files with 2 additions and 2 deletions
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4
mad/fact.mad
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@ -1,7 +1,7 @@
;; Functions to calculate factorial
;; Recursive version, not tail call optimized
(def recFact (fn (n) (if (< n 2) 1 (* n (recFact (- n 1))))))
(def recFact (fn (n) (if (< n 2) 1 (* n (recFact (dec n))))))
;; Apply version
(def applyFact (fn (n) (if (< n 2) 1 (apply * (range 1 (+ n 1))))))
(def applyFact (fn (n) (if (< n 2) 1 (apply * (range 1 (inc n))))))