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factorial.r

REBOL [ Title: "Factorial" Date: 6-Jan-1999 File: %factorial.r Author: "Ken Lake" Purpose: "Compute a factorial" Comment: { This program uses a recursive algorithm to compute factorials. usage: ! [a] example ! 5 120 } library: [ level: 'intermediate platform: none type: none domain: 'math tested-under: none support: none license: none see-also: none ] ] !: func [a] [return either a > 1 [a * ! (a - 1)] [1]] print ! 5
halt ;; to terminate script if DO'ne from webpage