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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::ios_base::</span>setf</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-io.html">io</a>&lrm; | <a href="cpp-io-ios_base.html">ios base</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">fmtflags setf<span class="br0">(</span> fmtflags flags <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<div><span class="mw-geshi cpp source-cpp">fmtflags setf<span class="br0">(</span> fmtflags flags, fmtflags mask <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<p>&#35774;&#32622;&#26684;&#24335;&#21270;&#26631;&#24535;&#20197;&#25351;&#23450;&#35774;&#32622;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#35774;&#32622; <code>flags</code> &#25152;&#26631;&#35782;&#30340;&#26684;&#24335;&#21270;&#26631;&#24535;&#12290;&#31561;&#25928;&#22320;&#36827;&#34892;&#19979;&#21015;&#25805;&#20316;&#65306; <span class="t-c"><span class="mw-geshi cpp source-cpp">fl <span class="sy1">=</span> fl <span class="sy3">|</span> flags</span></span> &#65292;&#20854;&#20013; <code>fl</code> &#23450;&#20041;&#20869;&#37096;&#26684;&#24335;&#21270;&#26631;&#24535;&#30340;&#29366;&#24577;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#28165;&#38500; <code>mask</code> &#19979;&#30340;&#26684;&#24335;&#21270;&#26631;&#24535;&#65292;&#24182;&#35774;&#32622;&#34987;&#28165;&#38500;&#30340;&#26631;&#24535;&#20026; <code>flags</code> &#25152;&#25351;&#23450;&#32773;&#12290;&#31561;&#25928;&#22320;&#36827;&#34892;&#19979;&#21015;&#25805;&#20316;&#65306; <span class="t-c"><span class="mw-geshi cpp source-cpp">fl <span class="sy1">=</span> <span class="br0">(</span>fl <span class="sy3">&amp;</span> ~mask<span class="br0">)</span> <span class="sy3">|</span> <span class="br0">(</span>flags <span class="sy3">&amp;</span> mask<span class="br0">)</span></span></span> &#65292;&#20854;&#20013; <code>fl</code> &#23450;&#20041;&#26684;&#24335;&#21270;&#26631;&#24535;&#30340;&#20869;&#37096;&#29366;&#24577;&#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>flags, mask</td>
<td>-</td>
<td>&#26032;&#26684;&#24335;&#21270;&#35774;&#23450;&#12290; <code>mask</code> &#23450;&#20041;&#21738;&#20123;&#26631;&#24535;&#21487;&#20197;&#25913;&#21464;&#65292; <code>flags</code> &#23450;&#20041;&#35201;&#25913;&#21464;&#30340;&#26631;&#24535;&#20013;&#35813;&#35774;&#32622;&#37027;&#20123;&#65288;&#20854;&#20182;&#23558;&#34987;&#28165;&#38500;&#65289;&#12290;&#20004;&#20010;&#21442;&#25968;&#37117;&#33021;&#20026;&#19979;&#21015;&#24120;&#37327;&#30340;&#32452;&#21512;&#65306;
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<td>&#24120;&#37327;</td>
<td>&#35299;&#37322;</td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>dec</tt></a></td>
<td>&#20026;&#25972;&#25968; I/O &#20351;&#29992;&#21313;&#36827;&#21046;&#24213;&#65306;&#35265; <span class="t-lc"><a href="cpp-io-manip-hex.html">std::dec</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>oct</tt></a></td>
<td>&#20026;&#25972;&#25968; I/O &#20351;&#29992;&#20843;&#36827;&#21046;&#24213;&#65306;&#35265; <span class="t-lc"><a href="cpp-io-manip-hex.html">std::oct</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>hex</tt></a></td>
<td>&#20026;&#25972;&#25968; I/O &#20351;&#29992;&#21313;&#20845;&#36827;&#21046;&#24213;&#65306;&#35265; <span class="t-lc"><a href="cpp-io-manip-hex.html">std::hex</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>basefield</tt></a></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">dec<span class="sy3">|</span>oct<span class="sy3">|</span>hex</span></span> &#12290;&#36866;&#29992;&#20110;&#25513;&#30721;&#36816;&#31639;</td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>left</tt></a></td>
<td>&#24038;&#26657;&#27491;&#65288;&#28155;&#21152;&#22635;&#20805;&#23383;&#31526;&#21040;&#21491;&#65289;&#65306;&#35265; <span class="t-lc"><a href="cpp-io-manip-left.html">std::left</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>right</tt></a></td>
<td>&#21491;&#26657;&#27491;&#65288;&#28155;&#21152;&#22635;&#20805;&#23383;&#31526;&#21040;&#24038;&#65289;&#65306;&#35265; <span class="t-lc"><a href="cpp-io-manip-left.html">std::right</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>internal</tt></a></td>
<td>&#20869;&#37096;&#26657;&#27491;&#65288;&#28155;&#21152;&#22635;&#20805;&#23383;&#31526;&#21040;&#20869;&#37096;&#36873;&#23450;&#28857;&#65289;&#65306;&#35265; <span class="t-lc"><a href="cpp-io-manip-left.html">std::internal</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>adjustfield</tt></a></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">left<span class="sy3">|</span>right<span class="sy3">|</span>internal</span></span> &#12290;&#36866;&#29992;&#20110;&#25513;&#30721;&#36816;&#31639;</td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>scientific</tt></a></td>
<td>&#29992;&#31185;&#23398;&#35760;&#25968;&#27861;&#29983;&#25104;&#28014;&#28857;&#31867;&#22411;&#65292;&#25110;&#33509;&#19982; fixed &#32452;&#21512;&#21017;&#29992;&#21313;&#20845;&#36827;&#21046;&#35760;&#27861;&#65306;&#35265; <span class="t-lc"><a href="cpp-io-manip-fixed.html">std::scientific</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>fixed</tt></a></td>
<td>&#29992;&#23450;&#28857;&#35760;&#27861;&#29983;&#25104;&#28014;&#28857;&#31867;&#22411;&#65292;&#25110;&#33509;&#19982; scientific &#32452;&#21512;&#21017;&#29992;&#21313;&#20845;&#36827;&#21046;&#35760;&#27861;&#65306;&#35265; <span class="t-lc"><a href="cpp-io-manip-fixed.html">std::fixed</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>floatfield</tt></a></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">scientific<span class="sy3">|</span>fixed</span></span> &#12290;&#36866;&#29992;&#20110;&#25513;&#30721;&#36816;&#31639;</td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>boolalpha</tt></a></td>
<td>&#20197;&#23383;&#27597;&#25968;&#23383;&#26684;&#24335;&#25554;&#20837;&#24182;&#37322;&#20986; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span></span></span> &#31867;&#22411;&#65306;&#35265; <span class="t-lc"><a href="cpp-io-manip-boolalpha.html">std::boolalpha</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>showbase</tt></a></td>
<td>&#29983;&#25104;&#20026;&#25972;&#25968;&#36755;&#20986;&#25351;&#31034;&#25968;&#23383;&#22522;&#24213;&#30340;&#21069;&#32512;&#65292;&#36135;&#24065; I/O &#20013;&#35201;&#27714;&#29616;&#37329;&#25351;&#31034;&#22120;&#65306;&#35265; <span class="t-lc"><a href="cpp-io-manip-showbase.html">std::showbase</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>showpoint</tt></a></td>
<td>&#26080;&#26465;&#20214;&#20026;&#28014;&#28857;&#25968;&#36755;&#20986;&#29983;&#25104;&#23567;&#25968;&#28857;&#23383;&#31526;&#65306;&#35265; <span class="t-lc"><a href="cpp-io-manip-showpoint.html">std::showpoint</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>showpos</tt></a></td>
<td>&#20026;&#38750;&#36127;&#25968;&#20540;&#36755;&#20986;&#29983;&#25104; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">+</span></span></span> &#23383;&#31526;&#65292;&#35265; <span class="t-lc"><a href="cpp-io-manip-showpos.html">std::showpos</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>skipws</tt></a></td>
<td>&#22312;&#20855;&#20307;&#36755;&#20837;&#25805;&#20316;&#21069;&#36339;&#36807;&#21069;&#23548;&#31354;&#30333;&#31526;&#65306;&#35265; <span class="t-lc"><a href="cpp-io-manip-skipws.html">std::skipws</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>unitbuf</tt></a></td>
<td>&#22312;&#27599;&#27425;&#36755;&#20986;&#25805;&#20316;&#21518;&#20914;&#20837;&#36755;&#20986;&#65306;&#35265; <span class="t-lc"><a href="cpp-io-manip-unitbuf.html">std::unitbuf</a></span></td>
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<td><a href="cpp-io-ios_base-fmtflags.html"><tt>uppercase</tt></a></td>
<td>&#22312;&#20855;&#20307;&#36755;&#20986;&#30340;&#36755;&#20986;&#25805;&#20316;&#20013;&#20197;&#22823;&#20889;&#31561;&#20215;&#26367;&#25442;&#23567;&#20889;&#23383;&#31526;&#65306;&#35265; <span class="t-lc"><a href="cpp-io-manip-uppercase.html">std::uppercase</a></span></td>
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<p><br /></p>
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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>&#35843;&#29992;&#20989;&#25968;&#21069;&#30340;&#26684;&#24335;&#21270;&#26631;&#24535;</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>
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<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;iomanip&gt;</span>
<span class="kw4">const</span> <span class="kw4">double</span> PI <span class="sy1">=</span> <span class="nu16">3.1415926535</span><span class="sy4">;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">const</span> <span class="kw4">int</span> WIDTH <span class="sy1">=</span> <span class="nu0">15</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>.<span class="me1">setf</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">ios</span><span class="sy4">::</span><span class="me2">right</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#31561;&#20215;&#65306; cout &lt;&lt; right;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <a href="cpp-io-manip-setw.html"><span class="kw1797">std::<span class="me2">setw</span></span></a><span class="br0">(</span>WIDTH<span class="sy2">/</span><span class="nu0">2</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;radius&quot;</span>
<span class="sy1">&lt;&lt;</span> <a href="cpp-io-manip-setw.html"><span class="kw1797">std::<span class="me2">setw</span></span></a><span class="br0">(</span>WIDTH<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;circumference&quot;</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>.<span class="me1">setf</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">ios</span><span class="sy4">::</span><span class="me2">fixed</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">double</span> radius <span class="sy1">=</span> <span class="nu0">1</span><span class="sy4">;</span> radius <span class="sy1">&lt;=</span> <span class="nu0">6</span><span class="sy4">;</span> radius <span class="sy2">+</span><span class="sy1">=</span> <span class="nu16">0.5</span><span class="br0">)</span> <span class="br0">{</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <a href="cpp-io-manip-setprecision.html"><span class="kw1796">std::<span class="me2">setprecision</span></span></a><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <a href="cpp-io-manip-setw.html"><span class="kw1797">std::<span class="me2">setw</span></span></a><span class="br0">(</span>WIDTH<span class="sy2">/</span><span class="nu0">2</span><span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> radius
<span class="sy1">&lt;&lt;</span> <a href="cpp-io-manip-setprecision.html"><span class="kw1796">std::<span class="me2">setprecision</span></span></a><span class="br0">(</span><span class="nu0">2</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <a href="cpp-io-manip-setw.html"><span class="kw1797">std::<span class="me2">setw</span></span></a><span class="br0">(</span>WIDTH<span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <span class="br0">(</span><span class="nu0">2</span> <span class="sy2">*</span> PI <span class="sy2">*</span> radius<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</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">radius circumference
1.0 6.28
1.5 9.42
2.0 12.57
2.5 15.71
3.0 18.85
3.5 21.99
4.0 25.13
4.5 28.27
5.0 31.42
5.5 34.56
6.0 37.70</pre></div>
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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 class="t-dsc-member-div">
<div><a href="cpp-io-ios_base-flags.html"><span class="t-lines"><span>flags</span></span></a></div>
</div>
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<td>&#31649;&#29702;&#26684;&#24335;&#26631;&#24535;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<td>
<div class="t-dsc-member-div">
<div><a href="cpp-io-ios_base-unsetf.html"><span class="t-lines"><span>unsetf</span></span></a></div>
</div>
</td>
<td>&#28165;&#38500;&#29305;&#23450;&#26684;&#24335;&#30340;&#26631;&#24535;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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