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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | ; zenlisp example program
; By Nils M Holm, 1998-2007
; See the file LICENSE for conditions of use.
; Compute X!:
; (factorial '#5) => '#120
(require '~nmath)
(define (factorial n)
(letrec
((r* (lambda (n k)
(cond ((< k '#2) n)
(t (let ((l (quotient k '#2)))
(* (r* n l)
(r* (+ n l) (- k l)))))))))
(r* '#1 (natural n))))
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