srand.html

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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>srand</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">Other Standard C Functions</a> &gt; <a href=    "srand.html">srand</a>  </div>  <div class="name-format">    srand  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;stdlib.h&gt;  void srand( unsigned seed );</pre>  <p>The function srand() is used to seed the random sequence generated  by <a href="rand.html">rand</a>(). For any given <em>seed</em>,  rand() will generate a specific &quot;random&quot; sequence over and  over again.</p>  <pre class="example-code">   srand( time(<strong>NULL</strong>) );   for( i = 0; i &lt; 10; i++ )     printf( &quot;Random number #%d: %d\n&quot;, i, rand() );          </pre>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="rand.html">rand</a><br>    (Standard C Date &amp; Time) <a href=    "../stddate/time.html">time</a>  </div>  </div>  </td>    </tr>  </table></body></html>

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