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    <a href="../index-2.html">cppreference.com</a> &gt; <a href=
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    "precision.html">precision</a>
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    precision
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    Syntax:
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  <pre class="syntax-box">
  #include &lt;fstream&gt;
  streamsize precision();
  streamsize precision( streamsize p );
</pre>

  <p>The precision() function either sets or returns the current number
  of digits that is displayed for floating-point variables.</p>

  <p>For example, the following code sets the precision of the cout
  stream to 5:</p>
<pre class="prettyprint">
   float num = 314.15926535;
   cout.precision( 5 );
   cout &lt;&lt; num;
</pre>

  <p>This code displays the following output:</p>
<pre class="prettyprint">
   314.16
</pre>

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