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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | ; zenlisp example program
; By Nils M Holm, 1998-2007
; See the file LICENSE for conditions of use.
; Compute the product of a sequence of numbers:
; (product '#5 '#7) => '#210
(require '~nmath)
(define (product lo hi)
(letrec
((prod (lambda (x lim res)
(cond ((> x lim) res)
(t (prod (+ '#1 x) lim
(* res x)))))))
(let ((n-lo (natural lo))
(n-hi (natural hi)))
(prod (min n-lo n-hi) (max n-lo n-hi) '#1))))
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