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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>to_string</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-string.html">string</a>&lrm; | <a href="cpp-string-basic_string.html">basic string</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-string.html">&lt;string&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> to_string<span class="br0">(</span> <span class="kw4">int</span> value <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-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> to_string<span class="br0">(</span> <span class="kw4">long</span> value <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-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> to_string<span class="br0">(</span> <span class="kw4">long</span> <span class="kw4">long</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> to_string<span class="br0">(</span> <span class="kw4">unsigned</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> to_string<span class="br0">(</span> <span class="kw4">unsigned</span> <span class="kw4">long</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(5)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> to_string<span class="br0">(</span> <span class="kw4">unsigned</span> <span class="kw4">long</span> <span class="kw4">long</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(6)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> to_string<span class="br0">(</span> <span class="kw4">float</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(7)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> to_string<span class="br0">(</span> <span class="kw4">double</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(8)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> to_string<span class="br0">(</span> <span class="kw4">long</span> <span class="kw4">double</span> value <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(9)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div class="t-li1"><span class="t-li">1)</span> &#25226;&#26377;&#31526;&#21495;&#21313;&#36827;&#21046;&#25972;&#25968;&#36716;&#25442;&#20026;&#23383;&#31526;&#20018;&#65292;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fprintf.html"><span class="kw1846">std::<span class="me2">sprintf</span></span></a><span class="br0">(</span>buf, <span class="st0">&quot;%d&quot;</span>, value<span class="br0">)</span></span></span> &#22312;&#26377;&#36275;&#22815;&#22823;&#30340; <code>buf</code> &#26102;&#20135;&#29983;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#25226;&#26377;&#31526;&#21495;&#21313;&#36827;&#21046;&#25972;&#25968;&#36716;&#25442;&#20026;&#23383;&#31526;&#20018;&#65292;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fprintf.html"><span class="kw1846">std::<span class="me2">sprintf</span></span></a><span class="br0">(</span>buf, <span class="st0">&quot;%ld&quot;</span>, value<span class="br0">)</span></span></span> &#22312;&#26377;&#36275;&#22815;&#22823;&#30340; <code>buf</code> &#26102;&#20135;&#29983;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#25226;&#26377;&#31526;&#21495;&#21313;&#36827;&#21046;&#25972;&#25968;&#36716;&#25442;&#20026;&#23383;&#31526;&#20018;&#65292;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fprintf.html"><span class="kw1846">std::<span class="me2">sprintf</span></span></a><span class="br0">(</span>buf, <span class="st0">&quot;%lld&quot;</span>, value<span class="br0">)</span></span></span> &#22312;&#26377;&#36275;&#22815;&#22823;&#30340; <code>buf</code> &#26102;&#20135;&#29983;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#25226;&#26080;&#31526;&#21495;&#21313;&#36827;&#21046;&#25972;&#25968;&#36716;&#25442;&#20026;&#23383;&#31526;&#20018;&#65292;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fprintf.html"><span class="kw1846">std::<span class="me2">sprintf</span></span></a><span class="br0">(</span>buf, <span class="st0">&quot;%u&quot;</span>, value<span class="br0">)</span></span></span> &#22312;&#26377;&#36275;&#22815;&#22823;&#30340; <code>buf</code> &#26102;&#20135;&#29983;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<div class="t-li1"><span class="t-li">5)</span> &#25226;&#26080;&#31526;&#21495;&#21313;&#36827;&#21046;&#25972;&#25968;&#36716;&#25442;&#20026;&#23383;&#31526;&#20018;&#65292;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fprintf.html"><span class="kw1846">std::<span class="me2">sprintf</span></span></a><span class="br0">(</span>buf, <span class="st0">&quot;%lu&quot;</span>, value<span class="br0">)</span></span></span> &#22312;&#26377;&#36275;&#22815;&#22823;&#30340; <code>buf</code> &#26102;&#20135;&#29983;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<div class="t-li1"><span class="t-li">6)</span> &#25226;&#26080;&#31526;&#21495;&#21313;&#36827;&#21046;&#25972;&#25968;&#36716;&#25442;&#20026;&#23383;&#31526;&#20018;&#65292;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fprintf.html"><span class="kw1846">std::<span class="me2">sprintf</span></span></a><span class="br0">(</span>buf, <span class="st0">&quot;%llu&quot;</span>, value<span class="br0">)</span></span></span> &#22312;&#26377;&#36275;&#22815;&#22823;&#30340; <code>buf</code> &#26102;&#20135;&#29983;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<div class="t-li1"><span class="t-li">7,8)</span> &#25226;&#28014;&#28857;&#20540;&#36716;&#25442;&#20026;&#23383;&#31526;&#20018;&#65292;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fprintf.html"><span class="kw1846">std::<span class="me2">sprintf</span></span></a><span class="br0">(</span>buf, <span class="st0">&quot;%f&quot;</span>, value<span class="br0">)</span></span></span> &#22312;&#26377;&#36275;&#22815;&#22823;&#30340; <code>buf</code> &#26102;&#20135;&#29983;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<div class="t-li1"><span class="t-li">9)</span> &#25226;&#28014;&#28857;&#20540;&#36716;&#25442;&#20026;&#23383;&#31526;&#20018;&#65292;&#19982; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-c-fprintf.html"><span class="kw1846">std::<span class="me2">sprintf</span></span></a><span class="br0">(</span>buf, <span class="st0">&quot;%Lf&quot;</span>, value<span class="br0">)</span></span></span> &#22312;&#26377;&#36275;&#22815;&#22823;&#30340; <code>buf</code> &#26102;&#20135;&#29983;&#30340;&#20869;&#23481;&#30456;&#21516;&#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>value</td>
<td>-</td>
<td>&#38656;&#35201;&#36716;&#25442;&#30340;&#25968;&#20540;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#19968;&#20010;&#21253;&#21547;&#36716;&#25442;&#21518;&#20540;&#30340;&#23383;&#31526;&#20018;</p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<p>&#21487;&#33021;&#20174; <span class="t-lc"><a href="cpp-string-basic_string.html">std::string</a></span> &#30340;&#26500;&#36896;&#20989;&#25968;&#25243;&#20986; <span class="t-lc"><a href="cpp-memory-new-bad_alloc.html">std::bad_alloc</a></span> &#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">&#27880;&#24847;</span></h3>
<ul>
<li>&#23545;&#20110;&#28014;&#28857;&#31867;&#22411;&#65292; <code>std::to_string</code> &#21487;&#33021;&#20135;&#29983;&#19981;&#26399;&#24453;&#30340;&#32467;&#26524;&#65292;&#22240;&#20026;&#36820;&#22238;&#30340;&#23383;&#31526;&#20018;&#20013;&#30340;&#26377;&#25928;&#20301;&#25968;&#33021;&#20026;&#38646;&#65292;&#35265;&#31034;&#20363;&#12290;</li>
<li>&#36820;&#22238;&#20540;&#21487;&#20197;&#26126;&#26174;&#22320;&#26377;&#21035;&#20110; <code>std::cout</code> &#25152;&#40664;&#35748;&#25171;&#21360;&#30340;&#32467;&#26524;&#65292;&#35265;&#31034;&#20363;&#12290;</li>
<li><code>std::to_string</code> &#30001;&#20110;&#26684;&#24335;&#21270;&#30446;&#30340;&#20381;&#36182;&#26412;&#22320;&#29615;&#22659;&#65292;&#20174;&#32780;&#20174;&#22810;&#20010;&#32447;&#31243;&#21516;&#26102;&#35843;&#29992; <code>std::to_string</code> &#21487;&#33021;&#20250;&#23548;&#33268;&#35843;&#29992;&#30340;&#37096;&#20998;&#24207;&#21015;&#21270;&#32467;&#26524;&#12290; C++17 &#25552;&#20379;&#39640;&#24615;&#33021;&#12289;&#19981;&#20381;&#36182;&#26412;&#22320;&#29615;&#22659;&#30340;&#26367;&#29992;&#21697; <a href="cpp-utility-to_chars.html"><tt>std::to_chars</tt></a> &#12290;</li>
</ul>
<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="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;string&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">double</span> f <span class="sy1">=</span> <span class="nu16">23.43</span><span class="sy4">;</span>
<span class="kw4">double</span> f2 <span class="sy1">=</span> <span class="nu19">1e-9</span><span class="sy4">;</span>
<span class="kw4">double</span> f3 <span class="sy1">=</span> <span class="nu19">1e40</span><span class="sy4">;</span>
<span class="kw4">double</span> f4 <span class="sy1">=</span> <span class="nu19">1e-40</span><span class="sy4">;</span>
<span class="kw4">double</span> f5 <span class="sy1">=</span> <span class="nu0">123456789</span><span class="sy4">;</span>
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> f_str <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_string</span><span class="br0">(</span>f<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> f_str2 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_string</span><span class="br0">(</span>f2<span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#27880;&#24847;&#65306;&#36820;&#22238; &quot;0.000000&quot;</span>
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> f_str3 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_string</span><span class="br0">(</span>f3<span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#27880;&#24847;&#65306;&#19981;&#36820;&#22238; &quot;1e+40&quot;.</span>
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> f_str4 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_string</span><span class="br0">(</span>f4<span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#27880;&#24847;&#65306;&#36820;&#22238; &quot;0.000000&quot;</span>
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> f_str5 <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">to_string</span><span class="br0">(</span>f5<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;std::cout: &quot;</span> <span class="sy1">&lt;&lt;</span> f <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;to_string: &quot;</span> <span class="sy1">&lt;&lt;</span> f_str <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;<span class="es1">\n</span><span class="es1">\n</span>&quot;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;std::cout: &quot;</span> <span class="sy1">&lt;&lt;</span> f2 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;to_string: &quot;</span> <span class="sy1">&lt;&lt;</span> f_str2 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;<span class="es1">\n</span><span class="es1">\n</span>&quot;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;std::cout: &quot;</span> <span class="sy1">&lt;&lt;</span> f3 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;to_string: &quot;</span> <span class="sy1">&lt;&lt;</span> f_str3 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;<span class="es1">\n</span><span class="es1">\n</span>&quot;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;std::cout: &quot;</span> <span class="sy1">&lt;&lt;</span> f4 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;to_string: &quot;</span> <span class="sy1">&lt;&lt;</span> f_str4 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;<span class="es1">\n</span><span class="es1">\n</span>&quot;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;std::cout: &quot;</span> <span class="sy1">&lt;&lt;</span> f5 <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;to_string: &quot;</span> <span class="sy1">&lt;&lt;</span> f_str5 <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>
</div>
<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">std::cout: 23.43
to_string: 23.430000
std::cout: 1e-09
to_string: 0.000000
std::cout: 1e+40
to_string: 10000000000000000303786028427003666890752.000000
std::cout: 1e-40
to_string: 0.000000
std::cout: 1.23457e+08
to_string: 123456789.000000</pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-string-basic_string-to_wstring.html"><span class="t-lines"><span>to_wstring</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>&#36716;&#25442;&#25972;&#25968;&#25110;&#28014;&#28857;&#20540;&#20026; <code>wstring</code><br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-string-basic_string-stoul.html"><span class="t-lines"><span>stoul</span><span>stoull</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>
<td>&#36716;&#25442;&#23383;&#31526;&#20018;&#20026;&#26080;&#31526;&#21495;&#25972;&#25968;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-string-basic_string-stol.html"><span class="t-lines"><span>stoi</span><span>stol</span><span>stoll</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>&#36716;&#25442;&#23383;&#31526;&#20018;&#20026;&#26377;&#31526;&#21495;&#25972;&#25968;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-string-basic_string-stof.html"><span class="t-lines"><span>stof</span><span>stod</span><span>stold</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>
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<td>&#36716;&#25442;&#23383;&#31526;&#20018;&#20026;&#28014;&#28857;&#20540;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div><a href="cpp-utility-to_chars.html"><span class="t-lines"><span>to_chars</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div>
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<td>&#36716;&#25442;&#25972;&#25968;&#25110;&#28014;&#28857;&#20540;&#21040;&#23383;&#31526;&#24207;&#21015;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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