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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>atol</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 String and Character</a> &gt; <a href=    "atol.html">atol</a>  </div>  <div class="name-format">    atol  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;stdlib.h&gt;  long atol( const char *str );</pre>  <p>The function atol() converts <em>str</em> into a long, then  returns that value. atol() will read from <em>str</em> until it finds  any character that should not be in a long. The resulting truncated  value is then converted and returned. For example,</p>  <pre class="example-code">   x = atol( &quot;1024.0001&quot; );           </pre>  <p>results in x being set to 1024L.</p>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="atof.html">atof</a><br>    <a href="atoi.html">atoi</a><br>    (Standard C I/O) <a href="../stdio/sprintf.html">sprintf</a><br>    <a href="strtol.html">strtol</a>  </div>  </div>  </td>    </tr>  </table></body></html>

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