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    <a href="../index-2.html">cppreference.com</a> &gt; <a href=
    "index.html">Standard C Math</a> &gt; <a href="abs.html">abs</a>
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    abs
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    Syntax:
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  #include &lt;cstdlib&gt;
  int abs( int num );
</pre>

  <p>The abs() function returns the absolute value of <em>num</em>. For
  example:</p>
<pre class="prettyprint">
   int magic_number = 10;
   cout &lt;&lt; &quot;Enter a guess: &quot;;
   cin &gt;&gt; x;
   cout &lt;&lt; &quot;Your guess was &quot; &lt;&lt; abs( magic_number - x ) &lt;&lt; &quot; away from the magic number.&quot; &lt;&lt; endl;
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