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<!DOCTYPE html>
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<title>islessequal</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_numeric_math_islessequal skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading">islessequal</h1>
<div id="bodyContent">
<div id="contentSub"><span class="subpages">&lt; <a href="c.html">c</a>&lrm; | <a href="c-numeric.html">numeric</a>&lrm; | <a href="c-numeric-math.html">math</a></span></div>
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<td>
<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;math.h&gt;</code></div>
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<td></td>
<td></td>
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<tr class="t-dcl t-since-c99">
<td>
<div><span class="mw-geshi c source-c"><span class="co2">#define islessequal(x, y) /* implementation defined */</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
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<p>&#30830;&#23450;&#28014;&#28857;&#25968; <code>x</code> &#26159;&#21542;&#23567;&#20110;&#25110;&#31561;&#20110;&#28014;&#28857;&#25968; <code>y</code> &#65292;&#32780;&#19981;&#35774;&#32622;&#28014;&#28857;&#24322;&#24120;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>x</td>
<td>-</td>
<td>&#28014;&#28857;&#20540;</td>
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<td>y</td>
<td>-</td>
<td>&#28014;&#28857;&#20540;</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#33509; <span class="t-c"><span class="mw-geshi c source-c">x <span class="sy1">&lt;=</span> y</span></span> &#21017;&#20026;&#38750;&#38646;&#25972;&#25968;&#20540;&#65292;&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi c source-c">&#8203;<span class="nu0">0</span>&#8203;</span></span> &#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">&#27880;&#24847;</span></h3>
<p>&#33509;&#19968;&#25110;&#20004;&#20010;&#21442;&#25968;&#20026; NaN &#65292;&#21017;&#20869;&#24314;&#30340; <span class="t-c"><span class="mw-geshi c source-c">operator<span class="sy1">&lt;=</span></span></span> &#23545;&#28014;&#28857;&#25968;&#21487;&#33021;&#24341;&#21457; <span class="t-lc"><a href="c-numeric-fenv-FE_exceptions.html">FE_INVALID</a></span> &#12290;&#27492;&#23439;&#26159; <span class="t-c"><span class="mw-geshi c source-c">operator<span class="sy1">&lt;=</span></span></span> &#30340;&ldquo;&#23433;&#38745;&rdquo;&#29256;&#26412;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="c source-c">
<pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;math.h&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">&quot;islessequal(2.0,1.0) = %d<span class="es1">\n</span>&quot;</span>, islessequal<span class="br0">(</span><span class="nu16">2.0</span>,<span class="nu16">1.0</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">&quot;islessequal(1.0,2.0) = %d<span class="es1">\n</span>&quot;</span>, islessequal<span class="br0">(</span><span class="nu16">1.0</span>,<span class="nu16">2.0</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">&quot;islessequal(1.0,1.0) = %d<span class="es1">\n</span>&quot;</span>, islessequal<span class="br0">(</span><span class="nu16">1.0</span>,<span class="nu16">1.0</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">&quot;islessequal(INFINITY,1.0) = %d<span class="es1">\n</span>&quot;</span>, islessequal<span class="br0">(</span>INFINITY,<span class="nu16">1.0</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">&quot;islessequal(1.0,NAN) = %d<span class="es1">\n</span>&quot;</span>, islessequal<span class="br0">(</span><span class="nu16">1.0</span>,NAN<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#21487;&#33021;&#30340;&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">islessequal(2.0,1.0) = 0
islessequal(1.0,2.0) = 1
islessequal(1.0,1.0) = 1
islessequal(INFINITY,1.0) = 0
islessequal(1.0,NAN) = 0</pre></div>
</div>
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<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">&#24341;&#29992;</span></h3>
<div class="t-ref-std-11">
<ul>
<li>C11 &#26631;&#20934;&#65288;ISO/IEC 9899:2011&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.12.14.4 The islessequal macro (p: 260)</li>
</ul>
</dd>
</dl>
<dl>
<dd>
<ul>
<li>F.10.11 Comparison macros (p: 531)</li>
</ul>
</dd>
</dl>
<div class="t-ref-std-c99">
<ul>
<li>C99 &#26631;&#20934;&#65288;ISO/IEC 9899:1999&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.12.14.4 The islessequal macro (p: 241)</li>
</ul>
</dd>
</dl>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div class="t-dsc-member-div">
<div><a href="c-numeric-math-isgreaterequal.html"><span class="t-lines"><span>isgreaterequal</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div>
</div>
</td>
<td>&#26816;&#26597;&#31532;&#19968;&#20010;&#28014;&#28857;&#21442;&#25968;&#26159;&#21542;&#22823;&#20110;&#31561;&#20110;&#31532;&#20108;&#20010;<br />
<span class="t-mark">(&#23439;&#20989;&#25968;)</span></td>
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