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<title>&lt;stdbool.h&gt;</title>
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<basefont size="3"> <a name="&lt;stdbool.h&gt;"></a> <a name="tag_13_46"></a><!-- &lt;stdbool.h&gt; -->
<!--header start-->
<center><font size="2">The Open Group Base Specifications Issue 6<br>
IEEE Std 1003.1-2001<br>
Copyright &copy; 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
<!--header end-->
<hr size="2" noshade>
<h4><a name="tag_13_46_01"></a>NAME</h4>
<blockquote>stdbool.h - boolean type and values</blockquote>
<h4><a name="tag_13_46_02"></a>SYNOPSIS</h4>
<blockquote class="synopsis">
<p><tt>#include &lt;stdbool.h&gt;</tt></p>
</blockquote>
<h4><a name="tag_13_46_03"></a>DESCRIPTION</h4>
<blockquote>
<div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"
border="0"> The functionality described on this reference page is aligned with the ISO&nbsp;C standard. Any conflict between the
requirements described here and the ISO&nbsp;C standard is unintentional. This volume of IEEE&nbsp;Std&nbsp;1003.1-2001 defers to
the ISO&nbsp;C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div>
<p>The <i>&lt;stdbool.h&gt;</i> header shall define the following macros:</p>
<dl compact>
<dt>bool</dt>
<dd>Expands to <b>_Bool</b>.</dd>
<dt>true</dt>
<dd>Expands to the integer constant 1.</dd>
<dt>false</dt>
<dd>Expands to the integer constant 0.</dd>
<dt>__bool_true_false_are_defined</dt>
<dd><br>
Expands to the integer constant 1.</dd>
</dl>
<p>An application may undefine and then possibly redefine the macros bool, true, and false.</p>
</blockquote>
<hr>
<div class="box"><em>The following sections are informative.</em></div>
<h4><a name="tag_13_46_04"></a>APPLICATION USAGE</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_13_46_05"></a>RATIONALE</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_13_46_06"></a>FUTURE DIRECTIONS</h4>
<blockquote>
<p>The ability to undefine and redefine the macros bool, true, and false is an obsolescent feature and may be withdrawn in a future
version.</p>
</blockquote>
<h4><a name="tag_13_46_07"></a>SEE ALSO</h4>
<blockquote>
<p>None.</p>
</blockquote>
<h4><a name="tag_13_46_08"></a>CHANGE HISTORY</h4>
<blockquote>
<p>First released in Issue 6. Included for alignment with the ISO/IEC&nbsp;9899:1999 standard.</p>
</blockquote>
<div class="box"><em>End of informative text.</em></div>
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