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shirok/gist:1187485

Created September 1, 2011 22:34
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gistfile1.scm
(use srfi-1)
(use slib)
(require 'format)
(define (arabic->roman n) (if (< 0 n 4000) (format "~@R" n) (error "oob")))
(define roman->arabic
(let1 tab (map (^n `(,(format "~@R" n) . ,n)) (iota 3999 1))
(^r (cond [(assoc r tab string-ci=?) => cdr] [else (error "huh?")]))))
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