2009-05-14から1日間の記事一覧
問題2.2 (define (make-segment x y) (cons x y)) (define (start-segment x) (car x)) (define (end-segment x) (cdr x)) (define (make-point a b) (cons a b)) (define (x-point x) (car x)) (define (y-point y) (cdr y)) (define (midpoint-segment a) …