{"id":86,"date":"2016-11-14T14:35:57","date_gmt":"2016-11-14T14:35:57","guid":{"rendered":"http:\/\/www.haoyuan.info\/?p=86"},"modified":"2016-11-14T14:35:57","modified_gmt":"2016-11-14T14:35:57","slug":"%e5%85%b3%e4%ba%8esrand%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/haoyuan.info\/?p=86","title":{"rendered":"\u5173\u4e8esrand()\u51fd\u6570"},"content":{"rendered":"

\u4e4b\u524d\u5728\u4e00\u4e9b\u4ee3\u7801\u7684\u6d4b\u8bd5\u4e0a\u9762\u5076\u5c14\u4f1a\u51fa\u73b0\u4e0d\u7528srand()\u8bbe\u7f6e\u79cd\u5b50\u7684\uff0c\u4e5f\u6709\u4e0d\u7406\u89e3srand()\u7528\u6765\u5e72\u4ec0\u4e48\u7684\u3002
\n\u867d\u7136\u4e0d\u7528srand()\u8bbe\u7f6e\u79cd\u5b50\u7a0b\u5e8f\u4e5f\u53ef\u4ee5\u8fd0\u884c\uff0c\u770b\u8d77\u6765\u4e5f\u8c8c\u4f3c\u662f\u6b63\u786e\u7684\u3002
\n\u4f46\u662f\u5b9e\u9645\u4e0a\u6211\u4eec\u4e0d\u96be\u53d1\u73b0\u5982\u679c\u7528rand()\u76f4\u63a5\u751f\u6210\u7684\u6570\u5217\uff0c\u662f\u6709\u89c4\u5f8b\u7684\u3002
\n\u6211\u4eec\u4ee5rand()%10+1\uff08\u4e5f\u5c31\u662f\u672c\u5468\u7684\u4f5c\u4e1a\uff09\u6765\u8bf4\u660e\u8fd9\u4e2a\u95ee\u9898\u3002
\n\u6211\u5199\u4e00\u4e2a\u7b80\u5355\u7684\u7a0b\u5e8f,\u6765\u8bf4\u660e\u8fd9\u4e2a\u95ee\u9898\u3002\u8fd0\u884c\u73af\u5883\u662fgcc 4.9 CLion 2016.2 for Windows (Windows 10\u5bb6\u5ead\u4e2d\u6587\u724864\u4f4d)<\/p>\n

[code lang=”c”]
\n#include<stdio.h>
\n#include<stdlib.h>
\nint main()
\n{
\n int i;
\n for (i = 0; i < 10; i++) {
\n printf("i[%d]=%d\\n",i,rand()%10+1);
\n }
\n return 0;
\n}
\n[\/code]<\/p>\n

\u4e8b\u5b9e\u4e0a\uff0c\u6211\u4eec\u8fd0\u884c\u4ee5\u540e\u7684\u7ed3\u679c\u6c38\u8fdc\u662f\u56fa\u5b9a\u7684\u3002<\/p>\n

\"rand()%10+1\u7684\u7ed3\u679c\"<\/div><\/p>\n

\u8fd9\u4e5f\u5c31\u662f\u4e3a\u4ec0\u4e48\u6211\u4eec\u8981\u7528srand()\u7684\u539f\u56e0\u3002\u8ba9rand()\u968f\u673a\u662f\u5f88\u91cd\u8981\u7684\u3002\u6211\u4eec\u4e0d\u59a8\u770b\u4e00\u4e0brand()\u7684\u5b9a\u4e49\u3002<\/p>\n

The C library function int rand(void)<\/b> returns a pseudo-random number in the range of 0 to RAND_MAX<\/i>.<\/p>\n

RAND_MAX is a constant whose default value may vary between implementations but it is granted to be at least 32767.<\/p><\/blockquote>\n

\u5f15\u7528\uff1ahttps:\/\/www.tutorialspoint.com\/c_standard_library\/c_function_rand.htm<\/a>
\n\u800c\u5728\u53e6\u4e00\u7bc7\u6587\u7ae0\u4e2d\u5173\u4e8esrand()\u7684\u4f5c\u7528\u5219\u662f\u8fd9\u6837\u89e3\u91ca\u7684\u3002
\n\uff08\u5f15\u7528\u81ea\u5b66\u6b65\u56ed-Srand\u51fd\u6570<\/a>\uff09<\/p>\n

\u6bd4\u5982VC\u4e2d\u5bf9\u4e8erand()\u51fd\u6570\u662f\u5982\u4e0b\u5b9e\u73b0\u7684\uff1a
\nint __cdecl rand (void)
\n{\u3000\u3000return(((holdrand = holdrand * 214013L + 2531011L) >> 16) & 0x7fff); }
\n————————————————————————-
\n\u800csrand()\u7684\u51fd\u6570\u662f\u5982\u4e0b\u5b9e\u73b0\u7684\uff1a
\nvoid __cdecl srand (unsigned int seed)
\n{
\n#ifdef _MT
\n_getptd()->_holdrand = (unsigned long)seed;
\n#else \/* _MT *\/
\nholdrand = (long)seed;
\n#endif \/* _MT *\/
\n}<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"

\u4e4b\u524d\u5728\u4e00\u4e9b\u4ee3\u7801\u7684\u6d4b\u8bd5\u4e0a\u9762\u5076\u5c14\u4f1a\u51fa\u73b0\u4e0d\u7528srand()\u8bbe\u7f6e\u79cd\u5b50\u7684\uff0c\u4e5f\u6709\u4e0d\u7406\u89e3srand()\u7528\u6765\u5e72\u4ec0\u4e48\u7684\u3002 \u867d\u7136\u4e0d […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"aside","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[1],"tags":[5],"class_list":["post-86","post","type-post","status-publish","format-aside","hentry","category-1","tag-c","post_format-post-format-aside"],"jetpack_featured_media_url":"","jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8UC2c-1o","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/haoyuan.info\/index.php?rest_route=\/wp\/v2\/posts\/86","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/haoyuan.info\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/haoyuan.info\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/haoyuan.info\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/haoyuan.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=86"}],"version-history":[{"count":2,"href":"https:\/\/haoyuan.info\/index.php?rest_route=\/wp\/v2\/posts\/86\/revisions"}],"predecessor-version":[{"id":89,"href":"https:\/\/haoyuan.info\/index.php?rest_route=\/wp\/v2\/posts\/86\/revisions\/89"}],"wp:attachment":[{"href":"https:\/\/haoyuan.info\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=86"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/haoyuan.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=86"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/haoyuan.info\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=86"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}