{"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fjaplj.hatenadiary.org%2Fentry%2F20090109%2F1231499344\" title=\"\u968e\u4e57\u306e\u5b9f\u88c5 - TopCoder\u3068J\u8a00\u8a9e\u3068\u6642\u3005F#\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"\u968e\u4e57\u306e\u5b9f\u88c5","url":"https://japlj.hatenadiary.org/entry/20090109/1231499344","author_name":"JAPLJ","width":"100%","blog_title":"TopCoder\u3068J\u8a00\u8a9e\u3068\u6642\u3005F#","categories":["J","F#"],"type":"rich","height":"190","image_url":null,"provider_name":"Hatena Blog","published":"2009-01-09 20:09:04","author_url":"https://blog.hatena.ne.jp/JAPLJ/","provider_url":"https://hatena.blog","version":"1.0","blog_url":"https://japlj.hatenadiary.org/","description":"\u518d\u5e30\u306e\u898b\u672c\u3068\u3057\u3066\u3088\u304f\u4f7f\u308f\u308c\u308b\u968e\u4e57\u3092J\u3068F#\u3067\u5b9f\u88c5\u3057\u3066\u307f\u308b\u30c6\u30b9\u30c8\u3002 F#\u306e\u5834\u5408 \u307e\u305a\u306f\u666e\u901a\u306b\u518d\u5e30\u7684\u306b\u5b9f\u88c5\u3057\u3066\u307f\u308b\u3002 let rec fact = function 0 -> 1 | n -> n * fact (n-1) \u6b21\u306b\u672b\u5c3e\u518d\u5e30\u306e\u5f62\u3067\u5b9f\u88c5\u3057\u3066\u307f\u308b\u3002 let rec fact2 n res = if n = 0 then res else fact2 (n-1) (res * n) \u6700\u5f8c\u306b\u624b\u7d9a\u304d\u7684\u306a\u5b9f\u88c5\u3082\u3084\u3063\u3066\u307f\u308b\u3002 let fact3 n = let res = ref 1 for i in [1..n] do res := !res * i res [\u4ee5\u4e0b\u8ffd\u8a18(2009/01/09 23\u2026"}