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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>substr</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++ Strings</a> &gt; <a href="substr.html">substr</a>  </div>  <div class="name-format">    substr  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;string&gt;  string substr( <strong>size_type</strong> index, <strong>size_type</strong> num = npos );</pre>  <p>The substr() function returns a substring of the current string,  starting at <em>index</em>, and <em>num</em> characters long. If  <em>num</em> is omitted, it will default to string::npos, and the  substr() function will simply return the remainder of the string  starting at <em>index</em>.</p>  <p>For example:</p>  <pre class="example-code">   string s(&quot;What we have here is a failure to communicate&quot;);   string sub = s.substr(21);   cout &lt;&lt; &quot;The original string is &quot; &lt;&lt; s &lt;&lt; endl;   cout &lt;&lt; &quot;The substring is &quot; &lt;&lt; sub &lt;&lt; endl;              </pre>  <p>displays</p>  <pre class="example-code">   The original string is What we have here is a failure to communicate   The substring is a failure to communicate            </pre>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="copy.html">copy</a>  </div>  </div>  </td>    </tr>  </table></body></html>

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