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srand [C++ Reference]
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<span class="bchead">You are here: </span><a href="../../start.html" title="start">C++ Reference</a> » <a href="../../c/start.html" title="c:start">The Standard C Library</a> » <a href="../../c/other/start.html" title="c:other:start">Other Standard C Functions</a> » <a href="../../c/other/srand.html" title="c:other:srand">srand</a> </div>
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<h2><a name="srand" id="srand">srand</a></h2>
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<p>
Syntax:
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<pre class="c code c++" style="font-family:monospace;"> <span class="co2">#include <cstdlib></span>
<span class="kw4">void</span> srand<span class="br0">(</span> <span class="kw4">unsigned</span> seed <span class="br0">)</span><span class="sy0">;</span></pre>
<p>
The function srand() is used to seed the random sequence generated by rand().
For any given seed, rand() will generate a specific “random” sequence over and
over again.
</p>
<pre class="c code c++" style="font-family:monospace;"> srand<span class="br0">(</span> time<span class="br0">(</span>NULL<span class="br0">)</span> <span class="br0">)</span><span class="sy0">;</span>
<span class="kw1">for</span><span class="br0">(</span> i <span class="sy0">=</span> <span class="nu0">0</span><span class="sy0">;</span> i <span class="sy0"><</span> <span class="nu0">10</span><span class="sy0">;</span> i<span class="sy0">++</span> <span class="br0">)</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/printf.html"><span class="kw3">printf</span></a><span class="br0">(</span> <span class="st0">"Random number #%d: %d<span class="es1">\n</span>"</span><span class="sy0">,</span> i<span class="sy0">,</span> rand<span class="br0">(</span><span class="br0">)</span> <span class="br0">)</span><span class="sy0">;</span></pre>
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Related Topics: <a href="../../c/other/rand.html" class="wikilink1" title="c:other:rand">rand</a>, <a href="../../c/date/time.html" class="wikilink1" title="c:date:time">(Standard C Date & Time) time</a>
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