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@ktakashi
Created September 8, 2013 08:12
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Code IQ hello world
#!r6rs
(import (only (rename (rnrs) (cons %cons) (+ %+))
define lambda let display newline integer->char length
quote %cons))
(define cons (lambda (x y) (lambda (z) (z x y))))
(define car (lambda (z) (z (lambda (x y) x))))
(define cdr (lambda (z) (z (lambda (x y) y))))
(define true (lambda (x y) (x)))
(define false (lambda (x y) (y)))
(define if (lambda (x y z) (x y z)))
;; 0 = (#t . _)
;; 1 = (#f #t . _)
(define zero (cons true false))
(define zero? (lambda (x) (car x)))
(define inc (lambda (x) (cons false x)))
(define dec (lambda (x) (cdr x)))
(define + (lambda (x y)
(if (zero? x)
(lambda () y)
(lambda () (+ (dec x) (inc y))))))
(define * (lambda (x y)
(if (zero? x)
(lambda () zero)
(lambda () (+ y (* (dec x) y))))))
;; hello world
;; -> (104 101 108 108 111 32 119 111 114 108 100)
;; -> ((100 + 4) ... 32 (100 + 19) ...)
(define %1 (inc zero))
(define %2 (inc %1))
(define %3 (inc %2))
(define %4 (inc %3))
(define %5 (inc %4))
(define %100 (* (* (* %5 %5) %2) %2))
;; helper
(define ->list (lambda (n)
(let loop ((n n) (r '()))
(if (zero? n)
(lambda () r)
(lambda () (loop (dec n) (%cons #t r)))))))
(define (put-char n)
(display (integer->char (length (->list n)))))
(put-char (+ %100 %4))
(put-char (+ %100 %1))
(put-char (+ %100 (* %4 %2)))
(put-char (+ %100 (* %4 %2)))
(put-char (+ %100 (+ (* %5 %2) %1)))
(put-char (+ (* %5 %5) (+ %3 %4)))
(put-char (+ %100 (dec (* (* %5 %2) %2))))
(put-char (+ %100 (inc (* %5 %2))))
(put-char (+ %100 (dec (* %5 %3))))
(put-char (+ %100 (* %4 %2)))
(put-char %100)
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