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<a name="trunc_002c-truncf_002d_002d_002dround-to-integer_002c-towards-zero"></a>
<h3 class="section">1.58 <code>trunc</code>, <code>truncf</code>&mdash;round to integer, towards zero</h3>
<a name="index-trunc"></a>
<a name="index-truncf"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;math.h&gt;
double trunc(double <var>x</var>);
float truncf(float <var>x</var>);

</pre></div>
<p><strong>Description</strong><br>
The <code>trunc</code> functions round their argument to the integer value, in
floating format, nearest to but no larger in magnitude than the
argument, regardless of the current rounding direction.  (While the
&quot;inexact&quot; floating-point exception behavior is unspecified by the C
standard, the <code>trunc</code> functions are written so that &quot;inexact&quot; is not
raised if the result does not equal the argument, which behavior is as
recommended by IEEE 754 for its related functions.)
</p>
<br>
<p><strong>Returns</strong><br>
<var>x</var> truncated to an integral value.
</p>
<br>
<p><strong>Portability</strong><br>
ANSI C, POSIX
</p>

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