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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>setbase</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-manip.html">manip</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-iomanip.html">&lt;iomanip&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*unspecified*/</span> setbase<span class="br0">(</span> <span class="kw4">int</span> base <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>&#35774;&#32622;&#27969;&#30340;&#25968;&#20540;&#24213;&#12290;&#29992;&#20110;&#34920;&#36798;&#24335; <span class="t-c"><span class="mw-geshi cpp source-cpp">out <span class="sy1">&lt;&lt;</span> setbase<span class="br0">(</span>base<span class="br0">)</span></span></span> &#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp">in <span class="sy1">&gt;&gt;</span> setbase<span class="br0">(</span>base<span class="br0">)</span></span></span> &#26102;&#65292;&#21462;&#20915;&#20110; <code>base</code> &#30340;&#20540;&#65292;&#26356;&#25913;&#27969; <code>out</code> &#25110; <code>in</code> &#30340; <code>basefield</code> &#26631;&#24535;&#65306;</p>
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<li>&#20540; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">16</span></span></span> &#35774;&#32622; <code>basefield</code> &#20026; <span class="t-lc"><a href="cpp-io-ios_base-fmtflags.html">std::ios_base::hex</a></span></li>
<li>&#20540; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">8</span></span></span> &#35774;&#32622; <span class="t-lc"><a href="cpp-io-ios_base-fmtflags.html">std::ios_base::oct</a></span></li>
<li>&#20540; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">10</span></span></span> &#35774;&#32622; <span class="t-lc"><a href="cpp-io-ios_base-fmtflags.html">std::ios_base::dec</a></span> &#12290;</li>
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<p>&#24322;&#20110; 8 &#12289; 10 &#25110; 16 &#30340; <code>base</code> &#20540;&#37325;&#32622; <code>basefield</code> &#20026;&#38646;&#65292;&#36825;&#23545;&#24212;&#21313;&#36827;&#21046;&#36755;&#20986;&#21644;&#20381;&#36182;&#21069;&#32512;&#30340;&#36755;&#20837;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>base</td>
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<td>basefield &#30340;&#26032;&#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>&#36820;&#22238;&#26410;&#25351;&#23450;&#31867;&#22411;&#30340;&#23545;&#35937;&#65292;&#20351;&#24471;&#33509; <code>str</code> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span></span></span> &#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-basic_istream.html"><span class="kw1713">std::<span class="me2">basic_istream</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span></span></span> &#31867;&#22411;&#30340;&#27969;&#21517;&#31216;&#65292;&#21017;&#34920;&#36798;&#24335; <span class="t-c"><span class="mw-geshi cpp source-cpp">str <span class="sy1">&lt;&lt;</span> setbase<span class="br0">(</span>base<span class="br0">)</span></span></span> &#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp">str <span class="sy1">&gt;&gt;</span> setbase<span class="br0">(</span>base<span class="br0">)</span></span></span> &#34920;&#29616;&#20026;&#22914;&#21516;&#25191;&#34892;&#19979;&#21015;&#20195;&#30721;&#65306;</p>
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<pre class="de1">str.<span class="me1">setf</span><span class="br0">(</span>base <span class="sy1">==</span> <span class="nu0">8</span> <span class="sy4">?</span> <a href="cpp-io-ios_base-fmtflags.html"><span class="kw1680">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">oct</span></span></a> <span class="sy4">:</span>
base <span class="sy1">==</span> <span class="nu0">10</span> <span class="sy4">?</span> <a href="cpp-io-ios_base-fmtflags.html"><span class="kw1679">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">dec</span></span></a> <span class="sy4">:</span>
base <span class="sy1">==</span> <span class="nu0">16</span> <span class="sy4">?</span> <a href="cpp-io-ios_base-fmtflags.html"><span class="kw1681">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">hex</span></span></a> <span class="sy4">:</span>
<a href="cpp-io-ios_base-fmtflags.html"><span class="kw1678">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">fmtflags</span></span></a><span class="br0">(</span><span class="nu0">0</span><span class="br0">)</span>,
<a href="cpp-io-ios_base-fmtflags.html"><span class="kw1682">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">basefield</span></span></a><span class="br0">)</span><span class="sy4">;</span></pre></div>
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<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;iostream&gt;</span>
<span class="co2">#include &lt;sstream&gt;</span>
<span class="co2">#include &lt;iomanip&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</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> <span class="st0">&quot;Parsing string <span class="es1">\&quot;</span>10 0x10 010<span class="es1">\&quot;</span><span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="kw4">int</span> n1, n2, n3<span class="sy4">;</span>
<a href="cpp-io-basic_istringstream.html"><span class="kw1735">std::<span class="me2">istringstream</span></span></a> s<span class="br0">(</span><span class="st0">&quot;10 0x10 010&quot;</span><span class="br0">)</span><span class="sy4">;</span>
s <span class="sy1">&gt;&gt;</span> std<span class="sy4">::</span><span class="me2">setbase</span><span class="br0">(</span><span class="nu0">16</span><span class="br0">)</span> <span class="sy1">&gt;&gt;</span> n1 <span class="sy1">&gt;&gt;</span> n2 <span class="sy1">&gt;&gt;</span> n3<span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;hexadecimal parse: &quot;</span> <span class="sy1">&lt;&lt;</span> n1 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="sy1">&lt;&lt;</span> n2 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="sy1">&lt;&lt;</span> n3 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
s.<span class="me1">clear</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
s.<span class="me1">seekg</span><span class="br0">(</span><span class="nu0">0</span><span class="br0">)</span><span class="sy4">;</span>
s <span class="sy1">&gt;&gt;</span> std<span class="sy4">::</span><span class="me2">setbase</span><span class="br0">(</span><span class="nu0">0</span><span class="br0">)</span> <span class="sy1">&gt;&gt;</span> n1 <span class="sy1">&gt;&gt;</span> n2 <span class="sy1">&gt;&gt;</span> n3<span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;prefix-dependent parse: &quot;</span> <span class="sy1">&lt;&lt;</span> n1 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="sy1">&lt;&lt;</span> n2 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="sy1">&lt;&lt;</span> n3 <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="sy1">&lt;&lt;</span> <span class="st0">&quot;hex output: &quot;</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">setbase</span><span class="br0">(</span><span class="nu0">16</span><span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <a href="cpp-io-manip-showbase.html"><span class="kw1766">std::<span class="me2">showbase</span></span></a> <span class="sy1">&lt;&lt;</span> n1 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="sy1">&lt;&lt;</span> n2 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="sy1">&lt;&lt;</span> n3 <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></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">Parsing string &quot;10 0x10 010&quot;
hexadecimal parse: 16 16 16
prefix-dependent parse: 10 16 8
hex output: 0xa 0x10 0x8</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><a href="cpp-io-manip-hex.html"><span class="t-lines"><span>dec</span><span>hex</span><span>oct</span></span></a></div>
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<td>&#26356;&#25913;&#29992;&#20110;&#25972;&#25968; I/O &#30340;&#22522;&#25968;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div><a href="cpp-io-manip-showbase.html"><span class="t-lines"><span>showbase</span><span>noshowbase</span></span></a></div>
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<td>&#25511;&#21046;&#26159;&#21542;&#20351;&#29992;&#21069;&#32512;&#25351;&#31034;&#25968;&#20540;&#22522;&#25968;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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