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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>showpos, <span style="font-size:0.7em; line-height:130%">std::</span>noshowpos</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-ios.html">&lt;ios&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-io-ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> showpos<span class="br0">(</span> <a href="cpp-io-ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str <span class="br0">)</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-io-ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> noshowpos<span class="br0">(</span> <a href="cpp-io-ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>&#21551;&#29992;&#25110;&#31105;&#29992;&#38750;&#36127;&#25968;&#36755;&#20986;&#20013;&#30340;&#27491;&#21495; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">&#39;+&#39;</span></span></span> &#30340;&#26174;&#31034;&#12290;&#22312;&#36755;&#20837;&#19978;&#26080;&#25928;&#26524;&#12290;</p>
<p>1) &#22914;&#21516;&#29992;&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">str.<span class="me1">setf</span><span class="br0">(</span><a href="cpp-io-ios_base-fmtflags.html"><span class="kw1693">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">showpos</span></span></a><span class="br0">)</span></span></span> &#21551;&#29992;&#27969; <code>str</code> &#20013;&#30340; <code>showpos</code> &#26631;&#24535; 2) &#22914;&#21516;&#29992;&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">str.<span class="me1">unsetf</span><span class="br0">(</span><a href="cpp-io-ios_base-fmtflags.html"><span class="kw1693">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">showpos</span></span></a><span class="br0">)</span></span></span> &#31105;&#29992;&#27969; <code>str</code> &#20013;&#30340; <code>showpos</code> &#26631;&#24535;</p>
<p>&#36825;&#26159;&#19968;&#20010; I/O &#25805;&#32437;&#31526;&#65292;&#21487;&#29992;&#22914; <span class="t-c"><span class="mw-geshi cpp source-cpp">out <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">showpos</span></span></span> &#30340;&#34920;&#36798;&#24335;&#23545;&#20219;&#20309; <span class="t-lc"><a href="cpp-io-basic_ostream.html">std::basic_ostream</a></span> &#31867;&#22411;&#30340; <code>out</code> &#25110;&#29992;&#22914; <span class="t-c"><span class="mw-geshi cpp source-cpp">in <span class="sy1">&gt;&gt;</span> std<span class="sy4">::</span><span class="me2">showpos</span></span></span> &#30340;&#34920;&#36798;&#24335;&#23545;&#20219;&#20309; <span class="t-lc"><a href="cpp-io-basic_istream.html">std::basic_istream</a></span> &#31867;&#22411;&#30340; <code>in</code> &#35843;&#29992;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>&#21040; I/O &#27969;&#30340;&#24341;&#29992;</td>
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<p><code>str</code> &#65288;&#21040;&#25805;&#32437;&#21518;&#30340;&#27969;&#30340;&#24341;&#29992;&#65289;</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;iostream&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;showpos: &quot;</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">showpos</span> <span class="sy1">&lt;&lt;</span> <span class="nu0">42</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="sy1">&lt;&lt;</span> <span class="nu16">3.14</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="sy1">&lt;&lt;</span> <span class="nu0">0</span> <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;noshowpos: &quot;</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">noshowpos</span> <span class="sy1">&lt;&lt;</span> <span class="nu0">42</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="sy1">&lt;&lt;</span> <span class="nu16">3.14</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span> <span class="sy1">&lt;&lt;</span> <span class="nu0">0</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></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">showpos: +42 +3.14 +0
noshowpos: 42 3.14 0</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-resetiosflags.html"><span class="t-lines"><span>resetiosflags</span></span></a></div>
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<td>&#28165;&#38500;&#25351;&#23450;&#30340; ios_base &#26631;&#24535;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div><a href="cpp-io-manip-setiosflags.html"><span class="t-lines"><span>setiosflags</span></span></a></div>
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<td>&#35774;&#32622;&#25351;&#23450;&#30340; ios_base &#26631;&#24535;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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