{"url":"https://tmurata.hatenadiary.org/entry/20100203/1265200252","blog_url":"https://tmurata.hatenadiary.org/","blog_title":"tmurata\u306e\u65e5\u8a18","author_name":"tmurata","height":"190","image_url":null,"author_url":"https://blog.hatena.ne.jp/tmurata/","title":"SICP\u554f\u984c3.38","provider_name":"Hatena Blog","description":"Peter, Paul, Mary (\u30d4\u30fc\u30bf\u30fc\u30fb\u30dd\u30fc\u30eb&\u30de\u30ea\u30fc\u306e\u3053\u3068?) \u304c\u6700\u521d\u306b100\u30c9\u30eb\u3042\u3063\u305f\u5171\u540c\u9280\u884c\u53e3\u5ea7\u306b\u4ee5\u4e0b\u306e\u64cd\u4f5c\u3092\u884c\u3063\u305f\u5834\u5408\u306e\u52d5\u304d ; Peter (set! balance (+ balance 10)) ; Paul (set! balance (- balance 20)) ; Mary (set! balance (- balance (/ balance 2))) a.\u9280\u884c\u30b7\u30b9\u30c6\u30e0\u304c\u4e09\u3064\u306e\u30d7\u30ed\u30bb\u30b9\u3092\u3042\u308b\u9806\u5e8f\u3067\u9010\u6b21\u7684\u306b\u8d70\u3089\u305b\u308b\u3068\u3057\u305f\u6642\u3001\u4e09\u3064\u306e\u53d6\u5f15\u5b8c\u4e86\u5f8c\u3001balance\u306e\u53ef\u80fd\u306a\u5024\u306f? 1. Peter->Paul->Mary (100 + 10 - 20) / 2 = 45 2\u2026","provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Ftmurata.hatenadiary.org%2Fentry%2F20100203%2F1265200252\" title=\"SICP\u554f\u984c3.38 - tmurata\u306e\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2010-02-03 21:30:52","version":"1.0","type":"rich","categories":["SICP"],"width":"100%"}