{"description":"\u7b2c4\u7ae0\u306f\u6570\u5b57\u306b\u95a2\u3059\u308b\u95a2\u6570\u3092\u3069\u3046\u3084\u3063\u3066\u518d\u5e30\u7684\u306b\u66f8\u304f\u304b\u3068\u3044\u3046\u8a71\u304c\u4e2d\u5fc3\u3002 \u7b2c\uff14\u7ae0\uff1a\u6570\u5b57\u5b9b\u3066\u30b2\u30fc\u30e0 add1/sub1 (define (add1 n) (+ n 1)) (define (sub1 n) (- n 1)) \u6570\u306b 1 \u3092\u8db3\u3059\u95a2\u6570\u3068\u6570\u304b\u3089 1 \u3092\u3072\u304f\u95a2\u6570\u3002 +/- (define (+ n m) (cond [(zero? m) n] [else (add1 (+ n (sub1 m)))])) (define (- n m) (cond [(zero? m) n] [else (sub1 (- n (sub1 m)))])) \u8db3\u3057\u7b97\u3068\u5f15\u304d\u7b97\u3092 add1\u3001sub1 \u3092\u4f7f\u3063\u3066\u518d\u5e30\u7684\u306b\u5b9a\u7fa9\u3059\u2026","height":"190","provider_url":"https://hatena.blog","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhjm333.hatenablog.com%2Fentry%2F2019%2F11%2F08%2F213000\" title=\"Scheme \u624b\u7fd2\u3044\uff08\uff13\uff09 - The King&#39;s Museum\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"Scheme \u624b\u7fd2\u3044\uff08\uff13\uff09","provider_name":"Hatena Blog","author_url":"https://blog.hatena.ne.jp/hjm333/","width":"100%","url":"https://hjm333.hatenablog.com/entry/2019/11/08/213000","blog_title":"The King's Museum","categories":["Scheme"],"version":"1.0","author_name":"hjm333","published":"2019-11-08 21:30:00","blog_url":"https://hjm333.hatenablog.com/","type":"rich","image_url":null}