23 hours ago
my attempt to do the exercises in sicp.
Saturday, July 19, 2008
sicp exercise 2.45
; Exercise 2.45. Right-split and up-split can be expressed as instances of a general splitting operation. Define a procedure split with the property that evaluating
; (define right-split (split beside below))
; (define up-split (split below beside))
; produces procedures right-split and up-split with the same behaviors as the ones already defined.
(define (split pos1 pos2)
(lambda (painter m)
(define (iter n)
(if (= n 0)
(let ((smaller (iter painter (- n 1))))
(pos1 painter (pos2 smaller smaller)))))
(define right-split (split beside below))
(define up-split (split below beside))