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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>#line</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">C/C++ Pre-processor Commands</a> &gt; <a href=    "line.html">#line</a>  </div>  <div class="name-format">    #line  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #line line_number &quot;filename&quot;</pre>  <p>The #line command is simply used to change the value of the  __LINE__ and __FILE__ variables. The filename is optional. The  __LINE__ and __FILE__ variables represent the current file and which  line is being read. The command</p>  <pre class="example-code">   #line 10 &quot;main.cpp&quot;                </pre>  <p>changes the current line number to 10, and the current file to  &quot;main.cpp&quot;.</p>  </div>  </td>    </tr>  </table></body></html>

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