{"provider_name":"Hatena Blog","author_name":"tmurata","description":"(\u8907\u7d20\u6570\u3092\u9664\u304f)\u5404\u578b\u306b\u3064\u3044\u3066\u3001\u305d\u306e\u578b\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5854\u306e\u4e2d\u3067\u4e00\u30ec\u30d9\u30eb\u9ad8\u3081\u308b\u6c4e\u7528\u624b\u7d9a\u304draise \u6f14\u7b97\u306e\u8a2d\u8a08\u3002 \u5f37\u5236\u578b\u5909\u63db(coercion)\u7528\u306e\u5854 complex \u2191 real \u2191 rational \u2191 integer ; \u6c4e\u7528\u6f14\u7b97\u30d1\u30c3\u30b1\u30fc\u30b8 (define (add x y) (apply-generic 'add x y)) (define (sub x y) (apply-generic 'sub x y)) (define (mul x y) (apply-generic 'mul x y)) (define (div x y) (apply-generic 'div x y)) (d\u2026","categories":["SICP"],"title":"SICP\u554f\u984c2.83","image_url":null,"blog_url":"https://tmurata.hatenadiary.org/","author_url":"https://blog.hatena.ne.jp/tmurata/","url":"https://tmurata.hatenadiary.org/entry/20091007/1254871077","type":"rich","published":"2009-10-07 08:17:57","width":"100%","blog_title":"tmurata\u306e\u65e5\u8a18","height":"190","version":"1.0","provider_url":"https://hatena.blog","html":""}