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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>String constructors</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=    "string_constructors.html">String constructors</a>  </div>  <div class="name-format">    String constructors  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;string&gt;  string();  string( const string&amp; s );  string( <strong>size_type</strong> length, const char&amp; ch );  string( const char* str );  string( const char* str, <strong>size_type</strong> length );  string( const string&amp; str, <strong>size_type</strong> index, <strong>size_type</strong> length );  string( <a href="../iterators.html">input_iterator</a> start, <a href="../iterators.html">input_iterator</a> end );  ~string();</pre>  <p>The string constructors create a new string containing:</p>  <ul>    <li>nothing; an empty string,</li>    <li>a copy of the given string <em>s</em>,</li>    <li><em>length</em> copies of <em>ch</em>,</li>    <li>a duplicate of <em>str</em> (optionally up to <em>length</em>    characters long),</li>    <li>a substring of <em>str</em> starting at <em>index</em> and    <em>length</em> characters long</li>    <li>a string of characterss denoted by the <em>start</em> and    <em>end</em> iterators</li>  </ul>  <p>For example,</p>  <pre class="example-code">   string str1( 5, &#39;c&#39; );   string str2( &quot;Now is the time...&quot; );   string str3( str2, 11, 4 );   cout &lt;&lt; str1 &lt;&lt; endl;   cout &lt;&lt; str2 &lt;&lt; endl;   cout &lt;&lt; str3 &lt;&lt; endl;            </pre>  <p>displays</p>  <pre class="example-code">   ccccc   Now is the time...   time         </pre>  <p>The string constructors usually run in <a href=  "../complexity.html">linear time</a>, except the empty constructor,  which runs in <a href="../complexity.html">constant time</a>.</p>  </div>  </td>    </tr>  </table></body></html>

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