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<h1 id="firstHeading" class="firstHeading">MATH_ERRNO, MATH_ERREXCEPT, math_errhandling</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 MATH_ERRNO &nbsp; &nbsp; &nbsp; &nbsp;1</span></span></div>
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<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
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<div><span class="mw-geshi c source-c"><span class="co2">#define MATH_ERREXCEPT &nbsp; &nbsp;2</span></span></div>
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<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
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<div><span class="mw-geshi c source-c"><span class="co2">#define math_errhandling &nbsp;/*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>&#23439;&#24120;&#37327; <code>math_errhandling</code> &#23637;&#24320;&#25104; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">int</span></span></span> &#31867;&#22411;&#30340;&#34920;&#36798;&#24335;&#65292;&#35201;&#20040;&#31561;&#20110; <code>MATH_ERRNO</code> &#65292;&#35201;&#20040;&#31561;&#20110; <code>MATH_ERREXCEPT</code> &#65292;&#35201;&#20040;&#31561;&#20110;&#20854;&#36880;&#20301;&#25110;&#65288; <span class="t-c"><span class="mw-geshi c source-c">MATH_ERRNO <span class="sy3">|</span> MATH_ERREXCEPT</span></span> &#65289;&#12290;</p>
<p><code>math_errhandling</code> &#30340;&#20540;&#25351;&#31034;&#28014;&#28857;&#36816;&#31639;&#31526;&#21644;<a href="cpp-numeric-math.html">&#20989;&#25968;</a>&#25152;&#36827;&#34892;&#30340;&#38169;&#35823;&#22788;&#29702;&#65306;</p>
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<td>&#24120;&#37327;</td>
<td>&#35299;&#37322;</td>
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<td><code>MATH_ERREXCEPT</code></td>
<td>&#25351;&#31034;&#20351;&#29992;&#28014;&#28857;&#24322;&#24120;&#65306; <span class="t-c"><span class="mw-geshi c source-c"><span class="sy1">&lt;</span>fenv.<span class="me1">h</span><span class="sy1">&gt;</span></span></span> &#20013;&#33267;&#23569;&#23450;&#20041;&#20102; <span class="t-lc"><a href="c-numeric-fenv-FE_exceptions.html">FE_DIVBYZERO</a></span> &#12289; <span class="t-lc"><a href="c-numeric-fenv-FE_exceptions.html">FE_INVALID</a></span> &#21450; <span class="t-lc"><a href="c-numeric-fenv-FE_exceptions.html">FE_OVERFLOW</a></span> &#12290;</td>
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<td><code>MATH_ERRNO</code></td>
<td>&#25351;&#26126;&#28014;&#28857;&#36816;&#31639;&#20351;&#29992;&#21464;&#37327; <span class="t-lc"><a href="c-error-errno.html">errno</a></span> &#25253;&#21578;&#38169;&#35823;&#12290;</td>
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<p>&#33509;&#23454;&#29616;&#25903;&#25345; IEEE &#28014;&#28857;&#31639;&#26415;&#65288; IEC 60559 &#65289;&#65292;&#21017;&#35201;&#27714; <span class="t-c"><span class="mw-geshi c source-c">math_errhandling <span class="sy3">&amp;</span> MATH_ERREXCEPT</span></span> &#38750;&#38646;&#12290;</p>
<p>&#35782;&#21035;&#19979;&#21015;&#28014;&#28857;&#38169;&#35823;&#26465;&#20214;&#65306;</p>
<table class="wikitable">
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<th>&#26465;&#20214;</th>
<th>&#35299;&#37322;</th>
<th>errno</th>
<th>&#28014;&#28857;&#24322;&#24120;</th>
<th>&#31034;&#20363;</th>
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<td>&#23450;&#20041;&#22495;&#38169;&#35823;</td>
<td>&#21442;&#25968;&#22312;&#35813;&#36816;&#31639;&#30340;&#25968;&#23398;&#19978;&#30340;&#23450;&#20041;&#22495;&#20043;&#22806;&#65288;<a href="c-numeric-math.html">&#27599;&#20010;&#20989;&#25968;</a>&#30340;&#25551;&#36848;&#21015;&#20986;&#20102;&#35201;&#27714;&#30340;&#23450;&#20041;&#22495;&#38169;&#35823;&#65289;</td>
<td><span class="t-lc"><a href="c-error-errno_macros.html">EDOM</a></span></td>
<td><span class="t-lc"><a href="c-numeric-fenv-FE_exceptions.html">FE_INVALID</a></span></td>
<td><span class="t-c"><span class="mw-geshi c source-c"><a href="c-numeric-math-acos.html"><span class="kw673">acos</span></a><span class="br0">(</span><span class="nu0">2</span><span class="br0">)</span></span></span></td>
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<td>&#26497;&#28857;&#38169;&#35823;</td>
<td>&#20989;&#25968;&#30340;&#25968;&#23398;&#32467;&#26524;&#24688;&#26159;&#26080;&#38480;&#22823;&#25110;&#26410;&#23450;&#20041;</td>
<td><span class="t-lc"><a href="c-error-errno_macros.html">ERANGE</a></span></td>
<td><span class="t-lc"><a href="c-numeric-fenv-FE_exceptions.html">FE_DIVBYZERO</a></span></td>
<td><span class="t-c"><span class="mw-geshi c source-c"><a href="c-numeric-math-log.html"><span class="kw660">log</span></a><span class="br0">(</span><span class="nu16">0.0</span><span class="br0">)</span></span></span> &#12289; <span class="t-c"><span class="mw-geshi c source-c"><span class="nu16">1.0</span><span class="sy2">/</span><span class="nu16">0.0</span></span></span></td>
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<td>&#19978;&#28322;&#25152;&#33268;&#30340;&#20540;&#22495;&#38169;&#35823;</td>
<td>&#25968;&#23398;&#32467;&#26524;&#26377;&#38480;&#65292;&#20294;&#33293;&#20837;&#21518;&#21464;&#20026;&#26080;&#38480;&#65292;&#25110;&#22312;&#21521;&#19979;&#33293;&#20837;&#21518;&#21464;&#25104;&#26368;&#22823;&#21487;&#34920;&#31034;&#26377;&#38480;&#20540;</td>
<td><span class="t-lc"><a href="c-error-errno_macros.html">ERANGE</a></span></td>
<td><span class="t-lc"><a href="c-numeric-fenv-FE_exceptions.html">FE_OVERFLOW</a></span></td>
<td><span class="t-c"><span class="mw-geshi c source-c"><a href="c-numeric-math-pow.html"><span class="kw668">pow</span></a><span class="br0">(</span><a href="c-types-limits.html"><span class="kw378">DBL_MAX</span></a>,<span class="nu0">2</span><span class="br0">)</span></span></span></td>
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<td>&#19979;&#28322;&#25152;&#33268;&#30340;&#20540;&#22495;&#38169;&#35823;</td>
<td>&#32467;&#26524;&#38750;&#38646;&#65292;&#20294;&#22240;&#20026;&#33293;&#20837;&#21464;&#20026;&#38646;&#65292;&#25110;&#21464;&#25104;&#38750;&#27491;&#35268;&#24182;&#26377;&#31934;&#24230;&#25439;&#22833;</td>
<td><span class="t-lc"><a href="c-error-errno_macros.html">ERANGE</a></span> &#25110;&#19981;&#25913;&#21464;&#65288;&#23454;&#29616;&#23450;&#20041;&#65289;</td>
<td><span class="t-lc"><a href="c-numeric-fenv-FE_exceptions.html">FE_UNDERFLOW</a></span> &#25110;&#26080;&#65288;&#23454;&#29616;&#23450;&#20041;&#65289;</td>
<td><span class="t-c"><span class="mw-geshi c source-c">DBL_TRUE_MIN<span class="sy2">/</span><span class="nu0">2</span></span></span></td>
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<td>&#32467;&#26524;&#19981;&#20934;&#30830;</td>
<td>&#32467;&#26524;&#24517;&#39035;&#34987;&#33293;&#20837;&#21040;&#30446;&#26631;&#31867;&#22411;</td>
<td>&#19981;&#25913;&#21464;</td>
<td><span class="t-lc"><a href="c-numeric-fenv-FE_exceptions.html">FE_INEXACT</a></span>&#25110;&#26080;&#65288;&#26410;&#25351;&#23450;&#65289;</td>
<td><span class="t-c"><span class="mw-geshi c source-c"><a href="c-numeric-math-sqrt.html"><span class="kw665">sqrt</span></a><span class="br0">(</span><span class="nu0">2</span><span class="br0">)</span></span></span> &#12289; <span class="t-c"><span class="mw-geshi c source-c"><span class="nu16">1.0</span><span class="sy2">/</span><span class="nu16">10.0</span></span></span></td>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">&#27880;&#24847;</span></h3>
<p>&#36890;&#24120;&#65292; <span class="t-lc"><a href="c-numeric-fenv-FE_exceptions.html">FE_INEXACT</a></span> &#26159;&#21542;&#20026;&#25968;&#23398;&#24211;&#20989;&#25968;&#25152;&#24341;&#21457;&#26159;&#26410;&#25351;&#23450;&#30340;&#65292;&#20294;&#36825;&#21487;&#20197;&#26174;&#24335;&#25351;&#23450;&#20110;&#20989;&#25968;&#30340;&#25551;&#36848;&#65288;&#20363;&#22914; <span class="t-lc"><a href="c-numeric-math-rint.html">rint</a></span> vs <span class="t-lc"><a href="c-numeric-math-nearbyint.html">nearbyint</a></span> &#65289;&#12290;</p>
<p>C99 &#21069;&#65292;&#28014;&#28857;&#24322;&#24120;&#26159;&#26410;&#25351;&#23450;&#30340;&#65292;&#35201;&#27714;&#23545;&#20110;&#20219;&#20309;&#23450;&#20041;&#20110;&#38169;&#35823;&#21457;&#29983; <span class="t-c"><span class="mw-geshi c source-c"><a href="c-error-errno_macros.html"><span class="kw426">EDOM</span></a></span></span> &#65292;&#35201;&#27714;&#23545;&#19978;&#28322;&#21644;&#23454;&#29616;&#23450;&#20041;&#30340;&#19979;&#28322;&#21457;&#29983; <span class="t-c"><span class="mw-geshi c source-c"><a href="c-error-errno_macros.html"><span class="kw478">ERANGE</span></a></span></span> &#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;fenv.h&gt;</span>
<span class="co2">#include &lt;math.h&gt;</span>
<span class="co2">#include &lt;errno.h&gt;</span>
<span class="co2">#pragma STDC FENV_ACCESS ON</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;MATH_ERRNO is %s<span class="es1">\n</span>&quot;</span>, math_errhandling <span class="sy3">&amp;</span> MATH_ERRNO <span class="sy4">?</span> <span class="st0">&quot;set&quot;</span> <span class="sy4">:</span> <span class="st0">&quot;not set&quot;</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;MATH_ERREXCEPT is %s<span class="es1">\n</span>&quot;</span>,
math_errhandling <span class="sy3">&amp;</span> MATH_ERREXCEPT <span class="sy4">?</span> <span class="st0">&quot;set&quot;</span> <span class="sy4">:</span> <span class="st0">&quot;not set&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-numeric-fenv-feclearexcept.html"><span class="kw718">feclearexcept</span></a><span class="br0">(</span><a href="c-numeric-fenv-FE_exceptions.html"><span class="kw729">FE_ALL_EXCEPT</span></a><span class="br0">)</span><span class="sy4">;</span>
<span class="kw2">errno</span> <span class="sy1">=</span> <span class="nu0">0</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;log(0) = %f<span class="es1">\n</span>&quot;</span>, <a href="c-numeric-math-log.html"><span class="kw660">log</span></a><span class="br0">(</span><span class="nu0">0</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span><span class="br0">(</span><span class="kw2">errno</span> <span class="sy1">==</span> <a href="c-error-errno_macros.html"><span class="kw478">ERANGE</span></a><span class="br0">)</span>
<a href="c-io-perror.html"><span class="kw879">perror</span></a><span class="br0">(</span><span class="st0">&quot;errno == ERANGE&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span><span class="br0">(</span><a href="c-numeric-fenv-fetestexcept.html"><span class="kw719">fetestexcept</span></a><span class="br0">(</span><a href="c-numeric-fenv-FE_exceptions.html"><span class="kw730">FE_DIVBYZERO</span></a><span class="br0">)</span><span class="br0">)</span>
<a href="c-io-puts.html"><span class="kw836">puts</span></a><span class="br0">(</span><span class="st0">&quot;FE_DIVBYZERO (pole error) reported&quot;</span><span class="br0">)</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">MATH_ERRNO is set
MATH_ERREXCEPT is set
log(0) = -inf
errno = ERANGE: Numerical result out of range
FE_DIVBYZERO (pole error) reported</pre></div>
</div>
</div>
<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>7.12/9 MATH_ERRNO, MATH_ERREXCEPT, math_errhandling (p: 233)</li>
</ul>
</dd>
</dl>
<dl>
<dd>
<ul>
<li>F.10/4 MATH_ERREXCEPT, math_errhandling (p: 517)</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>7.12/9 MATH_ERRNO, MATH_ERREXCEPT, math_errhandling (p: 214)</li>
</ul>
</dd>
</dl>
<dl>
<dd>
<ul>
<li>F.9/4 MATH_ERREXCEPT, math_errhandling&gt; (p: 454)</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-fenv-FE_exceptions.html"><span class="t-lines"><span>FE_ALL_EXCEPT</span><span>FE_DIVBYZERO</span><span>FE_INEXACT</span><span>FE_INVALID</span><span>FE_OVERFLOW</span><span>FE_UNDERFLOW</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>&#28014;&#28857;&#24322;&#24120;<br />
<span class="t-mark">(&#23439;&#24120;&#37327;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="c-error-errno.html"><span class="t-lines"><span>errno</span></span></a></div>
</div>
</td>
<td>&#23637;&#24320;&#25104; POSIX &#20860;&#23481;&#30340;&#32447;&#31243;&#23616;&#22495;&#38169;&#35823;&#32534;&#21495;&#21464;&#37327;<br />
<span class="t-mark">(&#23439;&#21464;&#37327;)</span></td>
</tr>
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