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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head>  <meta name="generator" content=  "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org">  <title>fprintf</title>  <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table>  <tr>  <td>  <div class="body-content">  <div class="header-box">    <a href="../index.html">cppreference.com</a> &gt; <a href=    "index.html">Standard C I/O</a> &gt; <a href=    "fprintf.html">fprintf</a>  </div>  <div class="name-format">    fprintf  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;stdio.h&gt;  int fprintf( FILE *stream, const char *format, ... );</pre>  <p>The fprintf() function sends information (the arguments) according  to the specified <em>format</em> to the file indicated by  <em>stream</em>. fprintf() works just like <a href=  "printf.html">printf</a>() as far as the format goes. The return  value of fprintf() is the number of characters outputted, or a  negative number if an error occurs. An example:</p>  <pre class="example-code">   char name[20] = &quot;Mary&quot;;   FILE *out;   out = fopen( &quot;output.txt&quot;, &quot;w&quot; );   if( out != <strong>NULL</strong> )     fprintf( out, &quot;Hello %s\n&quot;, name );              </pre>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="fputc.html">fputc</a><br>    <a href="fputs.html">fputs</a><br>    <a href="fscanf.html">fscanf</a><br>    <a href="printf.html">printf</a><br>    <a href="sprintf.html">sprintf</a>  </div>  </div>  </td>    </tr>  </table></body></html>

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