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          <div id="mw-content-text" style="direction: ltr;"><h1 class="section-heading" tabindex="0" aria-haspopup="true" data-section-id="0">
  <span class="mw-headline" id="title_0">stdio.h</span>
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  <p><code><span>stdio.h</span></code>（<span>英語：</span>，标准输入/输出头文件）是<a href="C%E8%AF%AD%E8%A8%80" title="C语言">C语言</a>为输入输出提供的<a href="C%E6%A0%87%E5%87%86%E5%BA%93" title="C标准库" class="mw-redirect">标准库</a><a href="%E5%A4%B4%E6%96%87%E4%BB%B6" title="头文件">头文件</a>，其前身是<a href="%E8%BF%88%E5%85%8B%C2%B7%E8%8E%B1%E6%96%AF%E5%85%8B" title="迈克·莱斯克">迈克·莱斯克</a>20世纪70年代编写的“可移植输入输出程序库”<span class="mw-ref reference" id="cite_ref-1"><a href="#cite_note-1" style="counter-reset: mw-Ref 1;"><span class="mw-reflink-text">[1]</span></a></span>。</p>

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一般</th></tr><tr><td class="sidebar-content" style="text-align: left">
<ul><li><a href="Stdlib.h#数据类型" title="Stdlib.h">数据类型</a></li>
<li><a href="Ctype.h" title="Ctype.h">字符类型</a></li>
<li><a href="String.h" title="String.h">字符串</a></li>
<li><a href="Math.h" title="Math.h">数学</a></li>
<li><a href="Stdio.h" class="mw-selflink selflink">文件输入/输出</a></li>
<li><a href="Time.h" title="Time.h">日期/时间</a></li>
<li><a href="Locale.h" title="Locale.h">本地化</a></li>
<li><a href="Stdlib.h#函数" title="Stdlib.h">内存分配</a></li>
<li><a href="Stdlib.h#函数" title="Stdlib.h">过程控制</a></li>
<li><a href="Signal.h" title="Signal.h">信号</a></li>
<li><a href="C%E6%9B%BF%E4%BB%A3%E6%A0%87%E8%AE%B0" title="C替代标记">替代标记</a></li></ul></td>
</tr><tr><th class="sidebar-heading">
杂项</th></tr><tr><td class="sidebar-content" style="text-align: left">
<ul><li><code>&lt;<a href="Assert.h" title="Assert.h">assert.h</a>&gt;</code></li>
<li><code>&lt;<a href="Errno.h" title="Errno.h">errno.h</a>&gt;</code></li>
<li><code>&lt;<a href="Setjmp.h" title="Setjmp.h">setjmp.h</a>&gt;</code></li>
<li><code>&lt;<a href="Stdarg.h" title="Stdarg.h">stdarg.h</a>&gt;</code></li></ul></td>
</tr><tr><td class="sidebar-navbar" style="line-height:1.6"><style data-mw-deduplicate="TemplateStyles:r79430951">.mw-parser-output .navbar{display:inline;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}</style></td></tr></tbody></table>

<p>C语言中的所有输入和输出都由抽象的字节流来完成，对文件的访问也通过关联的输入或输出流进行。这一模式随UNIX操作系统而普及，在现代操作系统和编程语言中仍被广泛应用。</p>

<meta property="mw:PageProp/toc">
</div><details data-level="2" open="">
    <summary class="section-heading"><h2 id="头文件内容">头文件内容</h2></summary>
    

    <details data-level="3" open="">
    <summary class="section-heading"><h3 id="类型">类型</h3></summary>
    
<table class="wikitable">
<tbody><tr>
<th>标识符</th><th>说明</th></tr>
<tr>
<td><code>size_t</code></td><td>用于表示大小的数据类型</td></tr>
<tr>
<td><code>FILE</code></td><td>记录流的信息的数据结构</td></tr>
<tr>
<td><code>fpos_t</code></td><td>用于在文件中定位的数据类型</td></tr>
</tbody></table>

</details>
<details data-level="3" open="">
    <summary class="section-heading"><h3 id="宏">宏</h3></summary>
    
<table class="wikitable">
<tbody><tr>
<th>标识符</th><th>说明</th></tr>
<tr>
<td><code>NULL</code></td><td>空指针</td></tr>
<tr>
<td><code>_IOFBF</code></td><td rowspan="3">用于控制缓冲方式的参数</td></tr>
<tr>
<td><code>_IOLBF</code></td></tr>
<tr>
<td><code>_IONBF</code></td></tr>
<tr>
<td><code>BUFSIZ</code></td><td><code>setbuf</code>函数使用的缓冲区大小</td></tr>
<tr>
<td><code>EOF</code></td><td>文件结尾标志</td></tr>
<tr>
<td><code>FOPEN_MAX</code></td><td>实现保证能够同时打开的文件数量</td></tr>
<tr>
<td><code>FILENAME_MAX</code></td><td>实现保证支持的最长文件名的字符数</td></tr>
<tr>
<td><code>L_tmpnam</code></td><td>存放<code>tmpnam</code>函数生成的临时文件名的<code>char</code>数组的大小</td></tr>
<tr>
<td><code>SEEK_CUR</code></td><td rowspan="3">用于控制文件定位方式的参数</td></tr>
<tr>
<td><code>SEEK_END</code></td></tr>
<tr>
<td><code>SEEK_SET</code></td></tr>
<tr>
<td><code>TMP_MAX</code></td><td>实现保证能生成的临时文件名个数</td></tr>
</tbody></table>


</details>
<details data-level="3" open="">
    <summary class="section-heading"><h3 id="标准流">标准流</h3></summary>
    
<table class="wikitable">
<tbody><tr>
<th>标识符</th><th>说明</th></tr>
<tr>
<td><code>stderr</code></td><td>标准错误流</td></tr>
<tr>
<td><code>stdin</code></td><td>标准输入流</td></tr>
<tr>
<td><code>stdout</code></td><td>标准输出流</td></tr>
</tbody></table>

</details>
<details data-level="3" open="">
    <summary class="section-heading"><h3 id="函数">函数</h3></summary>
    
<table class="wikitable">
<tbody><tr>
<th>类型</th><th>函数原型</th></tr>
<tr>
<td rowspan="10">文件操作</td><td><code>int remove(const char *filename);</code></td></tr>
<tr>
<td><code>int rename(const char *old, const char *new);</code></td></tr>
<tr>
<td><code>FILE *tmpfile(void);</code></td></tr>
<tr>
<td><code>char *tmpnam(char *s);</code></td></tr>
<tr>
<td><code>int fclose(FILE *stream);</code></td></tr>
<tr>
<td><code>int fflush(FILE *stream);</code></td></tr>
<tr>
<td><code>FILE *fopen(const char * restrict filename, const char * restrict mode);</code></td></tr>
<tr>
<td><code>FILE *freopen(const char * restrict filename, const char * restrict mode, FILE * restrict stream);</code></td></tr>
<tr>
<td><code>void setbuf(FILE * restrict stream, char * restrict buf);</code></td></tr>
<tr>
<td><code>int setvbuf(FILE * restrict stream, char * restrict buf, int mode, size_t size);</code></td></tr>
<tr>
<td rowspan="14">格式化输入输出</td><td><code>int fprintf(FILE * restrict stream, const char * restrict format, ...);</code></td></tr>
<tr>
<td><code>int fscanf(FILE * restrict stream, const char * restrict format, ...);</code></td></tr>
<tr>
<td><code>int printf(const char * restrict format, ...);</code></td></tr>
<tr>
<td><code>int scanf(const char * restrict format, ...);</code></td></tr>
<tr>
<td><code>int snprintf(char * restrict s, size_t n, const char * restrict format, ...);</code></td></tr>
<tr>
<td><code>int sprintf(char * restrict s, const char * restrict format, ...);</code></td></tr>
<tr>
<td><code>int sscanf(const char * restrict s, const char * restrict format, ...);</code></td></tr>
<tr>
<td><code>int vfprintf(FILE * restrict stream, const char * restrict format, va_list arg);</code></td></tr>
<tr>
<td><code>int vfscanf(FILE * restrict stream, const char * restrict format, va_list arg);</code></td></tr>
<tr>
<td><code>int vprintf(const char * restrict format, va_list arg);</code></td></tr>
<tr>
<td><code>int vscanf(const char * restrict format, va_list arg);</code></td></tr>
<tr>
<td><code>int vsnprintf(char * restrict s, size_t n, const char * restrict format, va_list arg);</code></td></tr>
<tr>
<td><code>int vsprintf(char * restrict s, const char * restrict format, va_list arg);</code></td></tr>
<tr>
<td><code>int vsscanf(const char * restrict s, const char * restrict format, va_list arg);</code></td></tr>
<tr>
<td rowspan="10">字符输入输出</td><td><code>int fgetc(FILE *stream);</code></td></tr>
<tr>
<td><code>char *fgets(char * restrict s, int n, FILE * restrict stream);</code></td></tr>
<tr>
<td><code>int fputc(int c, FILE *stream);</code></td></tr>
<tr>
<td><code>int fputs(const char * restrict s, FILE * restrict stream);</code></td></tr>
<tr>
<td><code>int getc(FILE *stream);</code></td></tr>
<tr>
<td><code>int getchar(void);</code></td></tr>
<tr>
<td><code>int putc(int c, FILE *stream);</code></td></tr>
<tr>
<td><code>int putchar(int c);</code></td></tr>
<tr>
<td><code>int puts(const char *s);</code></td></tr>
<tr>
<td><code>int ungetc(int c, FILE *stream);</code></td></tr>
<tr>
<td rowspan="2">直接输入输出</td><td><code>size_t fread(void * restrict ptr, size_t size, size_t nmemb, FILE * restrict stream);</code></td></tr>
<tr>
<td><code>size_t fwrite(const void * restrict ptr, size_t size, size_t nmemb, FILE * restrict stream);</code></td></tr>
<tr>
<td rowspan="5">文件内定位</td><td><code>int fgetpos(FILE * restrict stream, fpos_t * restrict pos);</code></td></tr>
<tr>
<td><code>int fseek(FILE *stream, long int offset, int whence);</code></td></tr>
<tr>
<td><code>int fsetpos(FILE *stream, const fpos_t *pos);</code></td></tr>
<tr>
<td><code>long int ftell(FILE *stream);</code></td></tr>
<tr>
<td><code>void rewind(FILE *stream);</code></td></tr>
<tr>
<td rowspan="4">错误处理</td><td><code>void clearerr(FILE *stream);</code></td></tr>
<tr>
<td><code>int feof(FILE *stream);</code></td></tr>
<tr>
<td><code>int ferror(FILE *stream);</code></td></tr>
<tr>
<td><code>void perror(const char *s);</code></td></tr>
</tbody></table>

</details>

</details><details data-level="2" open="">
    <summary class="section-heading"><h2 id="相关库">相关库</h2></summary>
    
<p><a href="C%2B%2B" title="C++">C++</a>引入了<code><a href="Iostream" title="Iostream">iostream</a></code>进行输入输出，但仍保留了<code>stdio.h</code>的功能。</p>

<p><a href="%E8%B4%9D%E5%B0%94%E5%AE%9E%E9%AA%8C%E5%AE%A4" title="贝尔实验室">贝尔实验室</a>开发了Sfio库，旨在弥补<code>stdio.h</code>在功能、速度和安全性上的不足。<span class="mw-ref reference" id="cite_ref-2"><a href="#cite_note-2" style="counter-reset: mw-Ref 2;"><span class="mw-reflink-text">[2]</span></a></span></p>

    
</details><details data-level="2" open="">
    <summary class="section-heading"><h2 id="参见">参见</h2></summary>
    
<ul><li><a href="I/O" title="I/O">I/O</a></li>
<li><a href="Wchar.h" title="Wchar.h">wchar.h</a></li></ul>

    
</details><details data-level="2" open="">
    <summary class="section-heading"><h2 id="参考文献">参考文献</h2></summary>
    
<div class="reflist " style=" list-style-type: decimal;">
<ol class="mw-references references"><li id="cite_note-1"> <span id="mw-reference-text-cite_note-1" class="mw-reference-text"><cite class="citation book">Kernighan, Brian; Pike, Rob. <a href="https://archive.org/details/unixprogramminge0000kern" class="external text external"></a>. Englewood Cliffs: <a href="Prentice_Hall" title="Prentice Hall" class="mw-redirect">Prentice Hall</a>. 1984: <a href="https://archive.org/details/unixprogramminge0000kern/page/200" class="external text external">200</a>.</cite></span></li><li id="cite_note-2"> <span id="mw-reference-text-cite_note-2" class="mw-reference-text"><cite class="citation conference">Korn, David G.; Vo, Kiem-Phong. . Proc. Summer USENIX Conf. 1991.</cite></span></li></ol></div>
<style data-mw-deduplicate="TemplateStyles:r80540462">.mw-parser-output .refbegin{font-size:90%;margin-bottom:0.5em}.mw-parser-output .refbegin-hanging-indents>ul{margin-left:0}.mw-parser-output .refbegin-hanging-indents>ul>li{margin-left:0;padding-left:3.2em;text-indent:-3.2em}.mw-parser-output .refbegin-hanging-indents ul,.mw-parser-output .refbegin-hanging-indents ul li{list-style:none}@media(max-width:720px){.mw-parser-output .refbegin-hanging-indents>ul>li{padding-left:1.6em;text-indent:-1.6em}}.mw-parser-output .refbegin-columns{margin-top:0.3em}.mw-parser-output .refbegin-columns ul{margin-top:0}.mw-parser-output .refbegin-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .refbegin-100{font-size:100%}</style><div class="refbegin  " style="">
<ul><li><cite class="citation book">ISO/IEC JTC 1/SC 22. <a href="https://web.archive.org/web/20180810010929/https://www.iso.org/standard/74528.html" class="external text external"></a>.  <span class="reference-accessdate"> [<span class="nowrap">2018-08-19</span>]</span>. （<a href="https://www.iso.org/standard/74528.html" class="external text external">原始内容</a>存档于2018-08-10）.</cite></li></ul>
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</details><details data-level="2" open="">
    <summary class="section-heading"><h2 id="外部链接">外部链接</h2></summary>
    
<ul><li><a href="http://zh.cppreference.com/w/c/io" class="external text external">C语言输入/输出参考手册</a><span>（</span><a href="https://web.archive.org/web/20180219090533/http://zh.cppreference.com/w/c/io" class="external text external">页面存档备份</a><span>，存于</span><a href="%E4%BA%92%E8%81%94%E7%BD%91%E6%A1%A3%E6%A1%88%E9%A6%86" title="互联网档案馆"></a><span>）</span></li></ul>



    
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