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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>strlen</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=    "strlen.html">strlen</a>  </div>  <div class="name-format">    strlen  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;string.h&gt;  size_t strlen( char *str );</pre>  <p>The strlen() function returns the length of <em>str</em>  (determined by the number of characters before null termination).</p>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="memcpy.html">memcpy</a><br>    <a href="strchr.html">strchr</a><br>    <a href="strcmp.html">strcmp</a><br>    <a href="strncmp.html">strncmp</a>  </div>  </div>  </td>    </tr>  </table></body></html>

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