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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>fegetround, <span style="font-size:0.7em; line-height:130%">std::</span>fesetround</h1>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="feexceptflag.html" title="cpp/numeric/fenv/feexceptflag"><span class="t-lines"><span>fegetexceptflag</span><span>fesetexceptflag</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>fegetround</span><span>fesetround</span></span></strong></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="feenv.html" title="cpp/numeric/fenv/feenv"><span class="t-lines"><span>fegetenv</span><span>fesetenv</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="feholdexcept.html" title="cpp/numeric/fenv/feholdexcept"><span class="t-lines"><span>feholdexcept</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="feupdateenv.html" title="cpp/numeric/fenv/feupdateenv"><span class="t-lines"><span>feupdateenv</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Macro constants</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="FE_exceptions.html" title="cpp/numeric/fenv/FE exceptions"><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-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="FE_round.html" title="cpp/numeric/fenv/FE round"><span class="t-lines"><span>FE_DOWNWARD</span><span>FE_TONEAREST</span><span>FE_TOWARDZERO</span><span>FE_UPWARD</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="FE_DFL_ENV.html" title="cpp/numeric/fenv/FE DFL ENV"><span class="t-lines"><span>FE_DFL_ENV</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/numeric/fenv/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dsc-header">
<td> <div>Defined in header <code><a href="../../header/cfenv.html" title="cpp/header/cfenv"><cfenv></a></code>
</div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span> fesetround<span class="br0">(</span> <span class="kw4">int</span> round <span class="br0">)</span></span></div></td>
<td> (1) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span> fegetround<span class="br0">(</span><span class="br0">)</span></span></div></td>
<td> (2) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>Manages the floating-point rounding direction.
</p>
<div class="t-li1"><span class="t-li">1)</span> Attempts to establish the floating-point rounding direction equal to the argument <code>round</code>, which is expected to be one of the <a href="FE_round.html" title="cpp/numeric/fenv/FE round">floating point rounding macros</a>. </div>
<div class="t-li1"><span class="t-li">2)</span> Returns the value of the <a href="FE_round.html" title="cpp/numeric/fenv/FE round">floating point rounding macro</a> that corresponds to the current rounding direction. </div>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="feround.html#Parameters"><span class="tocnumber">1</span> <span class="toctext">Parameters</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="feround.html#Return_value"><span class="tocnumber">2</span> <span class="toctext">Return value</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="feround.html#Notes"><span class="tocnumber">3</span> <span class="toctext">Notes</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="feround.html#Example"><span class="tocnumber">4</span> <span class="toctext">Example</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="feround.html#See_also"><span class="tocnumber">5</span> <span class="toctext">See also</span></a></li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/numeric/fenv/feround&action=edit&section=1" title="Edit section: Parameters">edit</a>]</span> <span class="mw-headline" id="Parameters">Parameters</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td> round
</td>
<td> -
</td>
<td> rounding direction, one of <a href="FE_round.html" title="cpp/numeric/fenv/FE round">floating point rounding macros</a>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/numeric/fenv/feround&action=edit&section=2" title="Edit section: Return value">edit</a>]</span> <span class="mw-headline" id="Return_value">Return value</span></h3>
<p>1) <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">0</span></span></span> on success, non-zero otherwise.
</p><p>2) the <a href="FE_round.html" title="cpp/numeric/fenv/FE round">floating point rounding macro</a> describing the current rounding direction or a negative value if the direction cannot be determined
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/numeric/fenv/feround&action=edit&section=3" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span></h3>
<p>The current rounding mode, reflecting the effects of the most recent <code>fesetround</code>, can also be queried with <span class="t-lc">FLT_ROUNDS</span>
</p><p>See <a href="FE_round.html" title="cpp/numeric/fenv/FE round">floating-point rounding macros</a> for the effects of rounding.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/numeric/fenv/feround&action=edit&section=4" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<div class="t-template-editlink" style="">
<span class="t-template editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/numeric/math/example_nearbyint&action=edit">[edit]</a></span></div><div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include <cmath></span>
<span class="co2">#include <cfenv></span>
<span class="co2">#include <iostream></span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="co2">#pragma STDC FENV_ACCESS ON</span>
std<span class="sy4">::</span><span class="me2">fesetround</span><span class="br0">(</span><a href="FE_round.html"><span class="kw1213">FE_DOWNWARD</span></a><span class="br0">)</span><span class="sy4">;</span>
<a href="../../io/cout.html"><span class="kw1479">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"rounding using FE_DOWNWARD: <span class="es1">\n</span>"</span> <span class="sy1"><<</span> <a href="../../io/manip/fixed.html"><span class="kw1505">std::<span class="me2">fixed</span></span></a>
<span class="sy1"><<</span> <span class="st0">" 12.0 -> "</span> <span class="sy1"><<</span> <a href="../math/nearbyint.html"><span class="kw1167">std::<span class="me2">nearbyint</span></span></a><span class="br0">(</span><span class="nu16">12.0</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
<span class="sy1"><<</span> <span class="st0">" 12.1 -> "</span> <span class="sy1"><<</span> <a href="../math/nearbyint.html"><span class="kw1167">std::<span class="me2">nearbyint</span></span></a><span class="br0">(</span><span class="nu16">12.1</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
<span class="sy1"><<</span> <span class="st0">"-12.1 -> "</span> <span class="sy1"><<</span> <a href="../math/nearbyint.html"><span class="kw1167">std::<span class="me2">nearbyint</span></span></a><span class="br0">(</span><span class="sy2">-</span><span class="nu16">12.1</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
<span class="sy1"><<</span> <span class="st0">" 12.5 -> "</span> <span class="sy1"><<</span> <a href="../math/nearbyint.html"><span class="kw1167">std::<span class="me2">nearbyint</span></span></a><span class="br0">(</span><span class="nu16">12.5</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
<span class="sy1"><<</span> <span class="st0">" 12.9 -> "</span> <span class="sy1"><<</span> <a href="../math/nearbyint.html"><span class="kw1167">std::<span class="me2">nearbyint</span></span></a><span class="br0">(</span><span class="nu16">12.9</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
<span class="sy1"><<</span> <span class="st0">"-12.9 -> "</span> <span class="sy1"><<</span> <a href="../math/nearbyint.html"><span class="kw1167">std::<span class="me2">nearbyint</span></span></a><span class="br0">(</span><span class="sy2">-</span><span class="nu16">12.9</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
<span class="sy1"><<</span> <span class="st0">" 13.0 -> "</span> <span class="sy1"><<</span> <a href="../math/nearbyint.html"><span class="kw1167">std::<span class="me2">nearbyint</span></span></a><span class="br0">(</span><span class="nu16">13.0</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">fesetround</span><span class="br0">(</span><a href="FE_round.html"><span class="kw1214">FE_TONEAREST</span></a><span class="br0">)</span><span class="sy4">;</span>
<a href="../../io/cout.html"><span class="kw1479">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"rounding using FE_TONEAREST: <span class="es1">\n</span>"</span>
<span class="sy1"><<</span> <span class="st0">" 12.0 -> "</span> <span class="sy1"><<</span> <a href="../math/nearbyint.html"><span class="kw1167">std::<span class="me2">nearbyint</span></span></a><span class="br0">(</span><span class="nu16">12.0</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
<span class="sy1"><<</span> <span class="st0">" 12.1 -> "</span> <span class="sy1"><<</span> <a href="../math/nearbyint.html"><span class="kw1167">std::<span class="me2">nearbyint</span></span></a><span class="br0">(</span><span class="nu16">12.1</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
<span class="sy1"><<</span> <span class="st0">"-12.1 -> "</span> <span class="sy1"><<</span> <a href="../math/nearbyint.html"><span class="kw1167">std::<span class="me2">nearbyint</span></span></a><span class="br0">(</span><span class="sy2">-</span><span class="nu16">12.1</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
<span class="sy1"><<</span> <span class="st0">" 12.5 -> "</span> <span class="sy1"><<</span> <a href="../math/nearbyint.html"><span class="kw1167">std::<span class="me2">nearbyint</span></span></a><span class="br0">(</span><span class="nu16">12.5</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
<span class="sy1"><<</span> <span class="st0">" 12.9 -> "</span> <span class="sy1"><<</span> <a href="../math/nearbyint.html"><span class="kw1167">std::<span class="me2">nearbyint</span></span></a><span class="br0">(</span><span class="nu16">12.9</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
<span class="sy1"><<</span> <span class="st0">"-12.9 -> "</span> <span class="sy1"><<</span> <a href="../math/nearbyint.html"><span class="kw1167">std::<span class="me2">nearbyint</span></span></a><span class="br0">(</span><span class="sy2">-</span><span class="nu16">12.9</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
<span class="sy1"><<</span> <span class="st0">" 13.0 -> "</span> <span class="sy1"><<</span> <a href="../math/nearbyint.html"><span class="kw1167">std::<span class="me2">nearbyint</span></span></a><span class="br0">(</span><span class="nu16">13.0</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">rounding using FE_DOWNWARD:
12.0 -> 12.000000
12.1 -> 12.000000
-12.1 -> -13.000000
12.5 -> 12.000000
12.9 -> 12.000000
-12.9 -> -13.000000
13.0 -> 13.000000
rounding using FE_TONEAREST:
12.0 -> 12.000000
12.1 -> 12.000000
-12.1 -> -12.000000
12.5 -> 12.000000
12.9 -> 13.000000
-12.9 -> -13.000000
13.0 -> 13.000000</pre></div></div>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/numeric/fenv/feround&action=edit&section=5" title="Edit section: See also">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="../math/nearbyint.html" title="cpp/numeric/math/nearbyint"> <span class="t-lines"><span>nearbyint</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> nearest integer using current rounding mode <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/numeric/math/dsc_nearbyint&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="../math/rint.html" title="cpp/numeric/math/rint"> <span class="t-lines"><span>rint</span><span>lrint</span><span>llrint</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> nearest integer using current rounding mode with <br /> exception if the result differs <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/numeric/math/dsc_rint&action=edit">[edit]</a></span>
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