{"id":299354,"date":"2024-05-20T17:15:31","date_gmt":"2024-05-20T09:15:31","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/299354.html"},"modified":"2024-05-20T17:15:41","modified_gmt":"2024-05-20T09:15:41","slug":"%e5%a6%82%e4%bd%95%e8%ae%a9c-%e8%af%bb%e5%8f%96%e6%96%87%e6%9c%ac%e7%89%b9%e5%ae%9a%e4%bd%8d%e7%bd%ae%e7%9a%84%e7%a9%ba%e5%80%bc","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/299354.html","title":{"rendered":"\u5982\u4f55\u8ba9C  \u8bfb\u53d6\u6587\u672c\u7279\u5b9a\u4f4d\u7f6e\u7684\u7a7a\u503c"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27151527\/1409271a-76b5-4b6c-aef8-94e40ed58615.webp\" alt=\"\u5982\u4f55\u8ba9C  \u8bfb\u53d6\u6587\u672c\u7279\u5b9a\u4f4d\u7f6e\u7684\u7a7a\u503c\" \/><\/p>\n<p><p>\u5f53C\u8bed\u8a00\u9700\u8981\u8bfb\u53d6\u6587\u672c\u6587\u4ef6\u4e2d\u7279\u5b9a\u4f4d\u7f6e\u7684\u7a7a\u503c\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7<strong>\u5b9a\u4f4d\u6587\u4ef6\u6307\u9488\u3001\u8bfb\u53d6\u5b57\u7b26\u6d41\u3001\u68c0\u67e5\u548c\u5904\u7406\u8bfb\u53d6\u5230\u7684\u6570\u636e<\/strong>\u6765\u5b8c\u6210\u6b64\u4efb\u52a1\u3002\u9996\u5148\uff0c\u4f60\u9700\u8981\u786e\u5b9a\u201c\u7a7a\u503c\u201d\u7684\u542b\u4e49\uff0c\u7a7a\u503c\u53ef\u4ee5\u662f\u7a7a\u767d\u5b57\u7b26\u3001\u6362\u884c\u7b26\u6216\u6587\u4ef6\u4e2d\u7684\u67d0\u4e2a\u7279\u5b9a\u4f4d\u7f6e\u6ca1\u6709\u5b57\u7b26\uff08\u4f8b\u5982\u6587\u4ef6\u7684\u672b\u5c3e\u6216\u4e24\u4e2a\u6587\u672c\u5b9e\u4f53\u4e4b\u95f4\uff09\u3002\u5904\u7406\u7a7a\u503c\u6700\u5e38\u89c1\u7684\u65b9\u6cd5\u5c31\u662f\u4f7f\u7528<strong>\u6587\u4ef6IO\u51fd\u6570<\/strong>\uff0c\u68c0\u67e5\u6240\u8bfb\u53d6\u7684\u5b57\u7b26\u662f\u5426\u6ee1\u8db3\u8bbe\u5b9a\u7684\u201c\u7a7a\u503c\u201d\u6761\u4ef6\u3002<\/p>\n<\/p>\n<p><p>\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u60f3\u68c0\u6d4b\u4e00\u4e2a\u7a7a\u683c\uff0c\u53ef\u4ee5\u4f7f\u7528<code>fgetc<\/code>\u51fd\u6570\u8bfb\u53d6\u5355\u4e2a\u5b57\u7b26\uff0c\u7136\u540e\u5224\u65ad\u5b83\u662f\u5426\u662f\u7a7a\u767d\u5b57\u7b26\u3002\u5982\u679c\u8981\u68c0\u67e5\u7279\u5b9a\u4f4d\u7f6e\uff0c\u53ef\u80fd\u9700\u8981\u7ed3\u5408<code>fseek<\/code>\u51fd\u6570\u6765\u79fb\u52a8\u6587\u4ef6\u6307\u9488\u5230\u671f\u671b\u7684\u4f4d\u7f6e\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u5b9e\u73b0\u8fd9\u4e00\u6d41\u7a0b\u3002<\/p>\n<\/p>\n<p><h3><strong>\u4e00\u3001\u6587\u4ef6\u6253\u5f00\u548c\u5b9a\u4f4d<\/strong><\/h3>\n<\/p>\n<p><p>\u9996\u5148\uff0c\u9700\u8981\u4f7f\u7528<code>fopen<\/code>\u51fd\u6570\u6765\u6253\u5f00\u6587\u4ef6\u3002\u63a5\u7740\uff0c\u7528<code>fseek<\/code>\u51fd\u6570\u5c06\u6587\u4ef6\u6307\u9488\u79fb\u52a8\u5230\u4f60\u60f3\u8981\u68c0\u67e5\u7684\u7279\u5b9a\u4f4d\u7f6e\u3002\u4f7f\u7528<code>fseek<\/code>\u65f6\uff0c\u4f60\u53ef\u4ee5\u9009\u62e9\u4ece\u6587\u4ef6\u5f00\u5934\uff08SEEK_SET\uff09\u3001\u5f53\u524d\u4f4d\u7f6e\uff08SEEK_CUR\uff09\u6216\u6587\u4ef6\u672b\u5c3e\uff08SEEK_END\uff09\u5f00\u59cb\u79fb\u52a8\u6307\u9488\uff0c\u5e76\u6307\u5b9a\u4ece\u8be5\u4f4d\u7f6e\u8d77\u7684\u504f\u79fb\u91cf\u3002<\/p>\n<\/p>\n<p><h3><strong>\u4e8c\u3001\u8bfb\u53d6\u5b57\u7b26\u548c\u68c0\u67e5\u7a7a\u503c<\/strong><\/h3>\n<\/p>\n<p><p>\u6587\u4ef6\u5b9a\u4f4d\u540e\uff0c\u4f7f\u7528<code>fgetc<\/code>\u6216<code>fread<\/code>\u51fd\u6570\u6765\u8bfb\u53d6\u6587\u4ef6\u4e2d\u7684\u5b57\u7b26\u3002\u901a\u8fc7\u68c0\u67e5\u8bfb\u53d6\u5230\u7684\u5b57\u7b26\u662f\u5426\u662f\u4f60\u8981\u627e\u7684\u7a7a\u503c\u7c7b\u578b\uff0c\u6bd4\u5982<code>isspace<\/code>\u51fd\u6570\u53ef\u4ee5\u7528\u6765\u68c0\u67e5\u7a7a\u767d\u5b57\u7b26\uff0c\u4f7f\u7528\u8fd9\u4e9b\u6807\u51c6\u5e93\u51fd\u6570\u53ef\u4ee5\u65b9\u4fbf\u5730\u5b9e\u73b0\u5b57\u7b26\u68c0\u67e5\u3002<\/p>\n<\/p>\n<p><h3><strong>\u4e09\u3001\u5904\u7406\u6587\u4ef6\u4e2d\u7684\u7a7a\u503c<\/strong><\/h3>\n<\/p>\n<p><p>\u68c0\u6d4b\u5230\u7a7a\u503c\u540e\uff0c\u4f60\u53ef\u80fd\u60f3\u8981\u505a\u4e00\u4e9b\u7279\u5b9a\u7684\u5904\u7406\u3002\u8fd9\u53ef\u80fd\u5305\u62ec\u8ba1\u6570\u3001\u6570\u636e\u6e05\u6d17\u3001\u8bb0\u5f55\u4f4d\u7f6e\u6216\u662f\u8fdb\u884c\u9002\u5f53\u7684\u8f6c\u6362\u5904\u7406\u3002\u4f60\u7684\u5904\u7406\u65b9\u5f0f\u4f1a\u57fa\u4e8e\u4f60\u7684\u5177\u4f53\u9700\u6c42\u3002<\/p>\n<\/p>\n<p><h3><strong>\u56db\u3001\u5173\u95ed\u6587\u4ef6<\/strong><\/h3>\n<\/p>\n<p><p>\u8bfb\u53d6\u548c\u5904\u7406\u5b8c\u6bd5\u540e\uff0c\u4f7f\u7528<code>fclose<\/code>\u51fd\u6570\u6765\u5173\u95ed\u6587\u4ef6\u3002\u8fd9\u662f\u4e00\u4e2a\u597d\u4e60\u60ef\uff0c\u53ef\u4ee5\u9632\u6b62\u8d44\u6e90\u6cc4\u6f0f\uff0c\u786e\u4fdd\u6570\u636e\u88ab\u6b63\u786e\u5730\u5199\u5165\u78c1\u76d8\u3002<\/p>\n<\/p>\n<p><h3><strong>\u4e94\u3001\u9519\u8bef\u5904\u7406<\/strong><\/h3>\n<\/p>\n<p><p>\u5728\u8bfb\u53d6\u6587\u4ef6\u7684\u8fc7\u7a0b\u4e2d\uff0c\u9519\u8bef\u5904\u7406\u4e5f\u975e\u5e38\u5173\u952e\u3002\u9700\u8981\u68c0\u67e5\u6bcf\u4e2a\u6587\u4ef6IO\u64cd\u4f5c\u7684\u8fd4\u56de\u503c\u3002\u4f8b\u5982\uff0c<code>fopen<\/code>\u5728\u65e0\u6cd5\u6253\u5f00\u6587\u4ef6\u65f6\u8fd4\u56deNULL\uff0c\u800c<code>fgetc<\/code>\u5728\u5230\u8fbe\u6587\u4ef6\u672b\u5c3e\u6216\u9047\u5230\u9519\u8bef\u65f6\u8fd4\u56deEOF\u3002\u9519\u8bef\u5904\u7406\u786e\u4fdd\u4ee3\u7801\u7684\u9c81\u68d2\u6027\uff0c\u907f\u514d\u7a0b\u5e8f\u5728\u987a\u5229\u6267\u884c\u65f6\u56e0\u672a\u9884\u6d4b\u5230\u7684\u9519\u8bef\u800c\u5d29\u6e83\u3002<\/p>\n<\/p>\n<p><h3><strong>\u516d\u3001\u5b9e\u4f8b\u6f14\u793a<\/strong><\/h3>\n<\/p>\n<p><p>\u63a5\u4e0b\u6765\uff0c\u6211\u5c06\u901a\u8fc7\u4e00\u4e2a\u5b9e\u4f8b\u6f14\u793a\u5982\u4f55\u8bfb\u53d6\u6587\u672c\u7279\u5b9a\u4f4d\u7f6e\u7684\u7a7a\u503c\u3002\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5c06\u5c1d\u8bd5\u8bfb\u53d6\u4e00\u4e2a\u6587\u672c\u6587\u4ef6\u4e2d\u7b2c100\u4e2a\u5b57\u7b26\u4f4d\u7f6e\uff0c\u68c0\u67e5\u5b83\u662f\u5426\u662f\u7a7a\u683c\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-c\">#include &lt;stdio.h&gt;<\/p>\n<p>#include &lt;stdlib.h&gt;<\/p>\n<p>#include &lt;ctype.h&gt;<\/p>\n<p>int m<a href=\"https:\/\/docs.pingcode.com\/blog\/59162.html\" target=\"_blank\">AI<\/a>n() {<\/p>\n<p>    FILE *file;<\/p>\n<p>    int pos = 100;<\/p>\n<p>    int ch;<\/p>\n<p>    file = fopen(&quot;example.txt&quot;, &quot;r&quot;);<\/p>\n<p>    if (file == NULL) {<\/p>\n<p>        fprintf(stderr, &quot;\u65e0\u6cd5\u6253\u5f00\u6587\u4ef6\u3002\\n&quot;);<\/p>\n<p>        return EXIT_FAILURE;<\/p>\n<p>    }<\/p>\n<p>    fseek(file, pos, SEEK_SET);<\/p>\n<p>    ch = fgetc(file);<\/p>\n<p>    if (ch == EOF) {<\/p>\n<p>        fprintf(stderr, &quot;\u8bfb\u53d6\u8fc7\u7a0b\u4e2d\u9047\u5230\u6587\u4ef6\u672b\u5c3e\u6216\u53d1\u751f\u9519\u8bef\u3002\\n&quot;);<\/p>\n<p>        fclose(file);<\/p>\n<p>        return EXIT_FAILURE;<\/p>\n<p>    }<\/p>\n<p>    if (isspace(ch)) {<\/p>\n<p>        printf(&quot;\u7b2c %d \u4e2a\u4f4d\u7f6e\u662f\u4e00\u4e2a\u7a7a\u503c\u3002\\n&quot;, pos + 1);<\/p>\n<p>    } else {<\/p>\n<p>        printf(&quot;\u7b2c %d \u4e2a\u4f4d\u7f6e\u4e0d\u662f\u7a7a\u503c\u3002\\n&quot;, pos + 1);<\/p>\n<p>    }<\/p>\n<p>    fclose(file);<\/p>\n<p>    return EXIT_SUCCESS;<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u6253\u5f00\u4e00\u4e2a\u540d\u4e3a<code>example.txt<\/code>\u7684\u6587\u4ef6\uff0c\u7136\u540e\u79fb\u52a8\u6587\u4ef6\u6307\u9488\u5230\u7b2c100\u4e2a\u5b57\u7b26\u4f4d\u7f6e\u3002\u4f7f\u7528<code>fgetc<\/code>\u6765\u8bfb\u53d6\u8be5\u4f4d\u7f6e\u7684\u5b57\u7b26\uff0c\u5e76\u4f7f\u7528<code>isspace<\/code>\u786e\u5b9a\u5b83\u662f\u5426\u4e3a\u7a7a\u767d\u5b57\u7b26\u3002\u7a0b\u5e8f\u5728\u9047\u5230\u9519\u8bef\u65f6\u4f1a\u5411stderr\u6253\u5370\u9519\u8bef\u4fe1\u606f\uff0c\u5e76\u5728\u5b8c\u6210\u8bfb\u53d6\u4efb\u52a1\u540e\u5173\u95ed\u6587\u4ef6\u3002<\/p>\n<\/p>\n<p><p>\u901a\u8fc7\u4e0a\u8ff0\u6b65\u9aa4\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u8ba9C\u8bed\u8a00\u8bfb\u53d6\u6587\u672c\u6587\u4ef6\u4e2d\u7279\u5b9a\u4f4d\u7f6e\u7684\u7a7a\u503c\uff0c\u5e76\u6839\u636e\u9700\u8981\u8fdb\u884c\u5904\u7406\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>\u5982\u4f55\u8ba9C\u8bed\u8a00\u8bfb\u53d6\u6587\u672c\u6587\u4ef6\u4e2d\u7684\u7279\u5b9a\u4f4d\u7f6e\u7684\u7a7a\u503c\uff1f<\/strong><\/p>\n<ol>\n<li>\n<p>\u5982\u4f55\u5728C\u8bed\u8a00\u4e2d\u6253\u5f00\u5e76\u8bfb\u53d6\u6587\u672c\u6587\u4ef6\uff1f<\/p>\n<ul>\n<li>\u9996\u5148\uff0c\u4f7f\u7528\u51fd\u6570<code>fopen<\/code>\u6765\u6253\u5f00\u6587\u672c\u6587\u4ef6\uff0c\u6307\u5b9a\u6253\u5f00\u6a21\u5f0f\u4e3a\u8bfb\u53d6\u6a21\u5f0f\uff08&quot;r&quot;\uff09\u3002<\/li>\n<li>\u7136\u540e\uff0c\u4f7f\u7528\u51fd\u6570<code>fscanf<\/code>\u6216<code>fgets<\/code>\u7b49\u51fd\u6570\u4ece\u6587\u4ef6\u4e2d\u8bfb\u53d6\u6570\u636e\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5982\u4f55\u5728C\u8bed\u8a00\u4e2d\u5b9a\u4f4d\u7279\u5b9a\u4f4d\u7f6e\u7684\u7a7a\u503c\uff1f<\/p>\n<ul>\n<li>\u4f7f\u7528\u5faa\u73af\u7ed3\u6784\u548c\u8ba1\u6570\u5668\uff0c\u9010\u6b65\u8bfb\u53d6\u6587\u672c\u6587\u4ef6\u4e2d\u7684\u6570\u636e\uff0c\u8bb0\u5f55\u6bcf\u4e2a\u5b57\u7b26\u7684\u4f4d\u7f6e\u3002<\/li>\n<li>\u5f53\u9047\u5230\u7a7a\u503c\u65f6\uff0c\u901a\u8fc7\u5224\u65ad\u6761\u4ef6\u5e76\u8bb0\u5f55\u5176\u4f4d\u7f6e\uff0c\u53ef\u4ee5\u5728\u540e\u7eed\u7684\u5904\u7406\u4e2d\u8fdb\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5982\u4f55\u5904\u7406\u7a7a\u503c\u53ca\u5176\u4f4d\u7f6e\uff1f<\/p>\n<ul>\n<li>\u53ef\u4ee5\u4f7f\u7528\u6761\u4ef6\u5224\u65ad\u8bed\u53e5\uff08if\u8bed\u53e5\uff09\u6765\u5224\u65ad\u662f\u5426\u9047\u5230\u4e86\u7a7a\u503c\u3002\u5982\u679c\u9047\u5230\u4e86\u7a7a\u503c\uff0c\u53ef\u4ee5\u901a\u8fc7\u76f8\u5e94\u7684\u5904\u7406\u903b\u8f91\u6765\u5904\u7406\u5b83\uff0c\u4f8b\u5982\u8df3\u8fc7\u8be5\u4f4d\u7f6e\u7ee7\u7eed\u8bfb\u53d6\u540e\u7eed\u7684\u6570\u636e\u3002<\/li>\n<li>\u53e6\u5916\uff0c\u53ef\u4ee5\u4f7f\u7528\u6307\u9488\u6765\u8bb0\u5f55\u7a7a\u503c\u7684\u4f4d\u7f6e\uff0c\u4ee5\u4fbf\u540e\u7eed\u8fdb\u884c\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p>\u8bf7\u6ce8\u610f\uff0c\u4ee5\u4e0a\u662f\u4e00\u79cd\u601d\u8def\uff0c\u5177\u4f53\u7684\u5b9e\u73b0\u53ef\u80fd\u4f1a\u6839\u636e\u5177\u4f53\u60c5\u51b5\u548c\u9700\u6c42\u6709\u6240\u4e0d\u540c\u3002\u5efa\u8bae\u6839\u636e\u5177\u4f53\u7684\u4ee3\u7801\u548c\u6570\u636e\u8981\u6c42\u6765\u8c03\u6574\u548c\u4f18\u5316\u4e0a\u8ff0\u601d\u8def\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5f53C\u8bed\u8a00\u9700\u8981\u8bfb\u53d6\u6587\u672c\u6587\u4ef6\u4e2d\u7279\u5b9a\u4f4d\u7f6e\u7684\u7a7a\u503c\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u5b9a\u4f4d\u6587\u4ef6\u6307\u9488\u3001\u8bfb\u53d6\u5b57\u7b26\u6d41\u3001\u68c0\u67e5\u548c\u5904\u7406\u8bfb\u53d6\u5230\u7684\u6570\u636e\u6765\u5b8c\u6210\u6b64\u4efb [&hellip;]","protected":false},"author":3,"featured_media":299370,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/299354"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=299354"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/299354\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/299370"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=299354"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=299354"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=299354"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}