{"version":"1.0","published":"2016-06-03 11:14:12","author_url":"https://blog.hatena.ne.jp/zehnpaard/","url":"https://zehnpaard.hatenablog.com/entry/2016/06/03/111412","width":"100%","type":"rich","provider_url":"https://hatena.blog","description":"SICP1.2.4\u306e\u554f\u984c1.17\u30681.18\u3092\u89e3\u3044\u3066\u307f\u308b\u3002 \u3068\u308a\u3042\u3048\u305adouble\u3068halve\u3092\u5b9a\u7fa9\uff1a (defn double [x] (* 2 x)) (defn halve [x] (/ x 2)) linear recursive\u306b\u66f8\u304f\u3068\u3053\u3093\u306a\u611f\u3058\uff1a (defn mul [a b] (cond (zero? b) 0 (even? b) (double (mul a (halve b))) :else (+ a (mul a (dec b))))) \u672b\u5c3e\u518d\u5e30\u304c\u52b9\u304f\u3088\u3046\u306b\u3059\u308b\u306a\u3089\u30011.16\u3068\u540c\u3058\u5f62\u306b\u306a\u308b\uff1a (defn mul-iter [a b] (loop [b b x 1 y a z \u2026","title":"SICP\u306e\u52c9\u5f37 \u554f\u984c1.17~18","blog_title":"Arantium Maestum","provider_name":"Hatena Blog","image_url":null,"categories":["Clojure","SICP"],"blog_url":"https://zehnpaard.hatenablog.com/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fzehnpaard.hatenablog.com%2Fentry%2F2016%2F06%2F03%2F111412\" title=\"SICP\u306e\u52c9\u5f37 \u554f\u984c1.17~18 - Arantium Maestum\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_name":"zehnpaard","height":"190"}