{"image_url":null,"provider_name":"Hatena Blog","author_name":"tanakaBox","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fboxnos.hatenablog.com%2Fentry%2F20070601%2F1180664695\" title=\" SICP\u3092\u8aad\u3080(14) \u554f\u984c1.17 - 1.19 \u5909\u63db\u304c\u308f\u304b\u3089\u306a\u3044\u30fb\u30fb\u30fb - \u30dc\u30af\u30ce\u30b9\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","categories":["Scheme"],"url":"https://boxnos.hatenablog.com/entry/20070601/1180664695","height":"190","version":"1.0","type":"rich","blog_url":"https://boxnos.hatenablog.com/","title":" SICP\u3092\u8aad\u3080(14) \u554f\u984c1.17 - 1.19 \u5909\u63db\u304c\u308f\u304b\u3089\u306a\u3044\u30fb\u30fb\u30fb","provider_url":"https://hatena.blog","author_url":"https://blog.hatena.ne.jp/tanakaBox/","published":"2007-06-01 11:24:55","width":"100%","description":"a \u554f\u984c1.17 \u3042\u3063\u3055\u308a\u89e3\u3051\u305f\u3002 (define (double x) (* x 2)) (define (halve x) (/ x 2)) (define (mul a b) (cond ((= b 0) 0) ((even? b) (+ a (double (mul a (halve x))))) (else (+ a (mul a (- b 1)))))) \u554f\u984c1.18 1.17\u3092\u53cd\u5fa9\u306b\u3059\u308b\u554f\u984c\u3002\u7c21\u5358\u3060\u3068\u601d\u3063\u3066\u3044\u305f\u306e\u306b\u3001\u3044\u304f\u3089\u8003\u3048\u3066\u3082\u7b54\u3048\u306b\u8fbf\u308a\u7740\u304b\u306a\u3044\u3002\u7b54\u3048\u3092\u898b\u305f\u3002SICP memo: \u554f\u984c1.18 product \u2190 product \u305d\u306e\u307e\u307e\u306a\u308b\u307b\u3069\u30022\u3067\u5272\u308a\u5207\u308c\u306a\u304f\u306a\u308b\u307e\u3067\u3001\u5408\u8a08\u2026","blog_title":"\u30dc\u30af\u30ce\u30b9"}