C++ random numbers
<p>How can I use random numbers in Linux and C++?</p>

<p>I have found some code I would like to use, it has the line</p>

<pre><code>srand((unsigned)time(0));//seed
</code></pre>

<p>but gcc says</p>

<blockquote>
  <p>board.cpp:94:24: error: ‘time’ was not declared in this scope</p>
</blockquote>

<p>I have included the following files</p>

<pre><code>#include &lt;stdio.h&gt;
#include &lt;stdlib.h&gt;
#include &lt;string.h&gt;
#include &lt;vector&gt;
#include &lt;algorithm&gt;
</code></pre>
