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<h1 id="firstHeading" class="firstHeading">fegetexceptflag, fesetexceptflag</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-fenv.html">fenv</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;fenv.h&gt;</code></div>
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<div><span class="mw-geshi c source-c"><span class="kw4">int</span> fegetexceptflag<span class="br0">(</span> fexcept_t<span class="sy2">*</span> flagp, <span class="kw4">int</span> excepts <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
<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="kw4">int</span> fesetexceptflag<span class="br0">(</span> <span class="kw4">const</span> fexcept_t<span class="sy2">*</span> flagp, <span class="kw4">int</span> excepts <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
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<p>1) &#35797;&#22270;&#33719;&#24471;&#21015;&#20110;&#20301;&#25513;&#30721;&#21442;&#25968; <code>excepts</code> &#30340;&#28014;&#28857;&#24322;&#24120;&#26631;&#24535;&#30340;&#23436;&#25972;&#20869;&#23481;&#65292;&#23427;&#26159;<a href="c-numeric-fenv-FE_exceptions.html">&#28014;&#28857;&#24322;&#24120;&#23439;</a>&#30340;&#36880;&#20301;&#25110;&#12290;</p>
<p>2) &#35797;&#22270;&#20174; <code>flagp</code> &#22797;&#21046;&#21015;&#20110; <code>excepts</code> &#30340;&#28014;&#28857;&#24322;&#24120;&#26631;&#24535;&#21040;&#28014;&#28857;&#29615;&#22659;&#12290;&#19981;&#24341;&#21457;&#20219;&#20309;&#24322;&#24120;&#65292;&#21482;&#20462;&#25913;&#26631;&#24535;&#12290;</p>
<p>&#28014;&#28857;&#24322;&#24120;&#26631;&#24535;&#30340;&#23436;&#25972;&#20869;&#23481;&#19981;&#24517;&#26159;&#25351;&#31034;&#26159;&#21542;&#24341;&#21457;&#25110;&#28165;&#38500;&#24322;&#24120;&#30340;&#24067;&#23572;&#20540;&#12290;&#20363;&#22914;&#65292;&#23427;&#21487;&#20197;&#26159;&#32467;&#26500;&#20307;&#65292;&#21253;&#21547;&#24067;&#23572;&#29366;&#24577;&#21644;&#35302;&#21457;&#20102;&#24322;&#24120;&#30340;&#20195;&#30721;&#22320;&#22336;&#12290;&#36825;&#20123;&#20989;&#25968;&#33719;&#24471;&#25152;&#26377;&#36825;&#31181;&#20869;&#23481;&#65292;&#24182;&#20197;&#23454;&#29616;&#23450;&#20041;&#26684;&#24335;&#20110; <code>flagp</code> &#33719;&#24471;/&#23384;&#20648;&#23427;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>flagp</td>
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<td>&#25351;&#21521;&#23558;&#35201;&#23384;&#20648;&#25110;&#35835;&#21462;&#26631;&#24535;&#20301;&#32622;&#30340; <span class="t-c"><span class="mw-geshi c source-c">fexcept_t</span></span> &#23545;&#35937;&#30340;&#25351;&#38024;</td>
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<td>excepts</td>
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<td>&#21015;&#20986;&#35201;&#33719;&#21462;/&#35774;&#32622;&#30340;&#24322;&#24120;&#30340;&#20301;&#25513;&#30721;</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>&#25104;&#21151;&#26102;&#36820;&#22238; <span class="t-c"><span class="mw-geshi c source-c">&#8203;<span class="nu0">0</span>&#8203;</span></span> &#65292;&#21542;&#21017;&#36820;&#22238;&#38750;&#38646;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;fenv.h&gt;</span>
<span class="co2">#pragma STDC FENV_ACCESS ON</span>
<span class="kw4">void</span> show_fe_exceptions<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="kw849">printf</span></a><span class="br0">(</span><span class="st0">&quot;current exceptions raised: &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="kw728">FE_DIVBYZERO</span></a><span class="br0">)</span><span class="br0">)</span> <a href="c-io-fprintf.html"><span class="kw849">printf</span></a><span class="br0">(</span><span class="st0">&quot; FE_DIVBYZERO&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="kw729">FE_INEXACT</span></a><span class="br0">)</span><span class="br0">)</span> <a href="c-io-fprintf.html"><span class="kw849">printf</span></a><span class="br0">(</span><span class="st0">&quot; FE_INEXACT&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_INVALID</span></a><span class="br0">)</span><span class="br0">)</span> <a href="c-io-fprintf.html"><span class="kw849">printf</span></a><span class="br0">(</span><span class="st0">&quot; FE_INVALID&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="kw731">FE_OVERFLOW</span></a><span class="br0">)</span><span class="br0">)</span> <a href="c-io-fprintf.html"><span class="kw849">printf</span></a><span class="br0">(</span><span class="st0">&quot; FE_OVERFLOW&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="kw732">FE_UNDERFLOW</span></a><span class="br0">)</span><span class="br0">)</span> <a href="c-io-fprintf.html"><span class="kw849">printf</span></a><span class="br0">(</span><span class="st0">&quot; FE_UNDERFLOW&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="kw727">FE_ALL_EXCEPT</span></a><span class="br0">)</span><span class="sy1">==</span><span class="nu0">0</span><span class="br0">)</span> <a href="c-io-fprintf.html"><span class="kw849">printf</span></a><span class="br0">(</span><span class="st0">&quot; none&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw849">printf</span></a><span class="br0">(</span><span class="st0">&quot;<span class="es1">\n</span>&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
fexcept_t excepts<span class="sy4">;</span>
<span class="coMULTI">/* &#35774;&#32622;&ldquo;&#24403;&#21069;&rdquo;&#24322;&#24120;&#26631;&#24535;&#38598;&#21512;&#12290; */</span>
<a href="c-numeric-fenv-feraiseexcept.html"><span class="kw720">feraiseexcept</span></a><span class="br0">(</span><a href="c-numeric-fenv-FE_exceptions.html"><span class="kw730">FE_INVALID</span></a><span class="br0">)</span><span class="sy4">;</span>
show_fe_exceptions<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="coMULTI">/* &#20445;&#23384;&#24403;&#21069;&#24322;&#24120;&#26631;&#24535;&#12290; */</span>
fegetexceptflag<span class="br0">(</span><span class="sy3">&amp;</span>excepts,<a href="c-numeric-fenv-FE_exceptions.html"><span class="kw727">FE_ALL_EXCEPT</span></a><span class="br0">)</span><span class="sy4">;</span>
<span class="coMULTI">/* &#20020;&#26102;&#24341;&#21457;&#20108;&#20010;&#20854;&#20182;&#24322;&#24120;&#12290; */</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="kw727">FE_ALL_EXCEPT</span></a><span class="br0">)</span><span class="sy4">;</span>
<a href="c-numeric-fenv-feraiseexcept.html"><span class="kw720">feraiseexcept</span></a><span class="br0">(</span><a href="c-numeric-fenv-FE_exceptions.html"><span class="kw731">FE_OVERFLOW</span></a> <span class="sy3">|</span> <a href="c-numeric-fenv-FE_exceptions.html"><span class="kw729">FE_INEXACT</span></a><span class="br0">)</span><span class="sy4">;</span>
show_fe_exceptions<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="coMULTI">/* &#24674;&#22797;&#20808;&#21069;&#30340;&#24322;&#24120;&#26631;&#24535;&#12290; */</span>
fesetexceptflag<span class="br0">(</span><span class="sy3">&amp;</span>excepts,<a href="c-numeric-fenv-FE_exceptions.html"><span class="kw727">FE_ALL_EXCEPT</span></a><span class="br0">)</span><span class="sy4">;</span>
show_fe_exceptions<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>
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<p>&#36755;&#20986;&#65306;</p>
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<div class="text source-text">
<pre class="de1">current exceptions raised: FE_INVALID
current exceptions raised: FE_INEXACT FE_OVERFLOW
current exceptions raised: FE_INVALID</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>7.6.2.2 The fegetexceptflag function (p: 210)</li>
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<li>7.6.2.4 The fesetexceptflag function (p: 211)</li>
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<div class="t-ref-std-c99">
<ul>
<li>C99 &#26631;&#20934;&#65288;ISO/IEC 9899:1999&#65289;&#65306;</li>
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<ul>
<li>7.6.2.2 The fegetexceptflag function (p: 191)</li>
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<li>7.6.2.4 The fesetexceptflag function (p: 192)</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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