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hustoj/web/cppreference-zh/chmhelp/c-numeric-math-isnormal.html
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<!DOCTYPE html>
<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>isnormal</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_numeric_math_isnormal skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading">isnormal</h1>
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<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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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;math.h&gt;</code></div>
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<div><span class="mw-geshi c source-c"><span class="co2">#define isnormal(arg) /* implementation defined */</span></span></div>
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<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
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<p>&#30830;&#23450;&#32473;&#23450;&#30340;&#28014;&#28857;&#25968; <code>arg</code> &#26159;&#21542;&#27491;&#35268;&#65292;&#21363;&#23427;&#19981;&#26159;&#38646;&#12289;&#38750;&#27491;&#35268;&#12289;&#26080;&#31351;&#22823;&#25110; <code>NaN</code> &#12290;&#35813;&#23439;&#36820;&#22238;&#25972;&#25968;&#20540;&#12290;</p>
<p>&#24573;&#30053; <span class="t-lc"><a href="c-types-limits-FLT_EVAL_METHOD.html">FLT_EVAL_METHOD</a></span> &#65306;&#21363;&#20351;&#20197;&#22810;&#20110;&#21442;&#25968;&#31867;&#22411;&#30340;&#33539;&#22260;&#21644;&#31934;&#24230;&#23545;&#23427;&#27714;&#20540;&#65292;&#39318;&#20808;&#20173;&#23558;&#23427;&#36716;&#25442;&#21040;&#20854;&#35821;&#20041;&#31867;&#22411;&#65292;&#28982;&#21518;&#20998;&#31867;&#22522;&#20110;&#35813;&#31867;&#22411;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
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<td>arg</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; <code>arg</code> &#27491;&#35268;&#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=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
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<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="co2">#include &lt;float.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="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;isnormal(NAN) = %d<span class="es1">\n</span>&quot;</span>, isnormal<span class="br0">(</span>NAN<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;isnormal(INFINITY) = %d<span class="es1">\n</span>&quot;</span>, isnormal<span class="br0">(</span>INFINITY<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;isnormal(0.0) = %d<span class="es1">\n</span>&quot;</span>, isnormal<span class="br0">(</span><span class="nu16">0.0</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;isnormal(DBL_MIN/2.0) = %d<span class="es1">\n</span>&quot;</span>, isnormal<span class="br0">(</span><a href="c-types-limits.html"><span class="kw375">DBL_MIN</span></a><span class="sy2">/</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="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;isnormal(1.0) = %d<span class="es1">\n</span>&quot;</span>, isnormal<span class="br0">(</span><span class="nu16">1.0</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">isnormal(NAN) = 0
isnormal(INFINITY) = 0
isnormal(0.0) = 0
isnormal(DBL_MIN/2.0) = 0
isnormal(1.0) = 1</pre></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>
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<li>7.12.3.5 The isnormal macro (p: 237)</li>
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<div class="t-ref-std-c99">
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<li>C99 &#26631;&#20934;&#65288;ISO/IEC 9899:1999&#65289;&#65306;</li>
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<ul>
<li>7.12.3.5 The isnormal macro (p: 217-218)</li>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="c-numeric-math-fpclassify.html"><span class="t-lines"><span>fpclassify</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>&#23545;&#32473;&#23450;&#30340;&#28014;&#28857;&#20540;&#20998;&#31867;<br />
<span class="t-mark">(&#23439;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="c-numeric-math-isfinite.html"><span class="t-lines"><span>isfinite</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div>
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<td>&#26816;&#26597;&#32473;&#23450;&#25968;&#26159;&#21542;&#20855;&#26377;&#26377;&#38480;&#20540;<br />
<span class="t-mark">(&#23439;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="c-numeric-math-isinf.html"><span class="t-lines"><span>isinf</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div>
</div>
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<td>&#26816;&#26597;&#32473;&#23450;&#25968;&#26159;&#21542;&#26159;&#26080;&#31351;&#22823;<br />
<span class="t-mark">(&#23439;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="c-numeric-math-isnan.html"><span class="t-lines"><span>isnan</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-c99">(C99)</span></span></span></div>
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<td>&#26816;&#26597;&#32473;&#23450;&#25968;&#26159;&#21542;&#20026; NaN<br />
<span class="t-mark">(&#23439;&#20989;&#25968;)</span></td>
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