bowmoq https://blog.hatena.ne.jp/bowmoq/ いらずんば https://bowmoq.hatenadiary.org/ sicp 時間切れでとばしていた、2.1.4 拡張問題：区間算術演算の問題を解く。 ;; sicp ex 2.7 (define (make-interval a b) (cons a b)) ;;選択子 (define (upper-bound interval) (max (car interval) (cdr interval))) (define (lower-bound interval) (min (car interval) (cdr interval))) ;; sicp ex 2.8 ;; 以下add-interval, mul-interval, div-intervalは本文から拝… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fbowmoq.hatenadiary.org%2Fentry%2F20090415%2F1239755442" title=" ex 2.7, 2.8, 2.9, 2.10 - いらずんば" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2009-04-15 09:30:42 rich https://bowmoq.hatenadiary.org/entry/20090415/1239755442 1.0 100%