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‎reference/cstdio.html

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<p class="text-right"><small>
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最終更新日時(UTC):
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<span itemprop="datePublished" content="2025-07-11T00:01:29">
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2025年07月11日 00時01分29秒
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<span itemprop="datePublished" content="2025-07-11T02:42:04">
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<tr>
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<td><code><span href="https://cpprefjp.github.io/reference/cstdio/ungetc.md.nolink">ungetc</span></code></td>
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<td><code><a href="cstdio/ungetc.html">ungetc</a></code></td>
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<td>入力ストリームに1文字戻す</td>
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<td></td>
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‎reference/cstdio/ungetc.html

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<span class="fa fa-fw fa-clock-o fa-flip-horizontal"></span>履歴
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<span class="fa fa-fw fa-pencil"></span>編集
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<div class="identifier-type">function</div><div class="header">&lt;cstdio&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">ungetc</span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="kt">int</span> <span class="nf">ungetc</span><span class="p">(</span><span class="kt">int</span> <span class="n">c</span><span class="p">,</span> <span class="kt">FILE</span> <span class="o">*</span><span class="n">stream</span><span class="p">);</span>
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</code></pre></div>
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</p>
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<h2>概要</h2>
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<p>符号なしの文字<code>c</code>を入力ストリーム<code>stream</code>に戻す。</p>
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<p>この関数は、連続してこの関数が呼び出される場合、入力ストリームへのプッシュ・バックを保証できる連続した文字は 1 つのみである。</p>
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<p>また、<code>c</code>は<code><a href="eof.html">EOF</a></code>であってはならない。</p>
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<p>この関数が呼び出されたのち、<code><span href="https://cpprefjp.github.io/reference/cstdio/fseek.md.nolink">fseek</span></code>や<code><span href="https://cpprefjp.github.io/reference/cstdio/fsetpos.md.nolink">fsetpos</span></code>、<code><span href="https://cpprefjp.github.io/reference/cstdio/rewind.md.nolink">rewind</span></code>、<code><a href="fflush.html">fflush</a></code>を呼び出すと、その関数の呼び出しによって戻された文字は失われる。</p>
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<h2><a class="cpprefjp-defined-word" data-desc="関数呼び出し式の評価結果となるオブジェクト・値">戻り値</a></h2>
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<p>成功したら挿入した<code>c</code>を、そうでなければ<code><a href="eof.html">EOF</a></code>を返す。</p>
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<h2>例</h2>
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<p><div class="yata" id="5af1df06287e4348fc9c2fa3bcf27b756071526a"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../cstdio.html">&lt;cstdio&gt;</a></span><span class="cp"></span>
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<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
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<span class="n"><a href="putchar.html">putchar</a></span><span class="p">(</span><span class="n"><a href="getchar.html">getchar</a></span><span class="p">());</span>
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<span class="n"><span style="color:#ff0000">ungetc</span></span><span class="p">(</span><span class="sc">'A'</span><span class="p">,</span> <span class="n">stdin</span><span class="p">);</span>
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<span class="n"><a href="putchar.html">putchar</a></span><span class="p">(</span><span class="n"><a href="getchar.html">getchar</a></span><span class="p">());</span>
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<span class="p">}</span>
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</code></pre></div>
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</div></p>
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<h3>入力</h3>
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<p><pre><code>a
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</code></pre></p>
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<h3>出力</h3>
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<p><pre><code>aA
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</code></pre></p>
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<h2>処理系</h2>
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<ul>
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<li><a href="../../implementation.html#clang">Clang</a>: ??</li>
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<li><a href="../../implementation.html#gcc">GCC</a>: ??</li>
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<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: ??</li>
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‎reference/ios/ios_base/sync_with_stdio.html

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<p class="text-right"><small>
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最終更新日時(UTC):
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<span itemprop="datePublished" content="2025-07-05T03:56:39">
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2025年07月05日 03時56分39秒
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<span itemprop="datePublished" content="2025-07-11T02:43:43">
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2025年07月11日 02時43分43秒
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<ul>
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<li>文字 <code>c</code> のストリームへの出力 <code><a href="../../cstdio/fputc.html">fputc</a>(f, c);</code> は <code>str.<a href="../basic_ios/rdbuf.html">rdbuf</a>()-&gt;<a href="../../streambuf/basic_streambuf/sputc.html">sputc</a>(c);</code> と等価であり、</li>
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<li>文字 <code>c</code> のストリームからの入力 <code>c = <a href="../../cstdio/fgetc.html">fgetc</a>(f);</code> は <code>c = str.<a href="../basic_ios/rdbuf.html">rdbuf</a>()-&gt;<a href="../../streambuf/basic_streambuf/sbumpc.html">sbumpc</a>();</code> と等価であり、</li>
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<li>文字 <code>c</code> のストリームへの戻し <code><span href="https://cpprefjp.github.io/reference/cstdio/ungetc.md.nolink">ungetc</span>(c, f)</code> は <code>str.<a href="../basic_ios/rdbuf.html">rdbuf</a>()-&gt;<a href="../../streambuf/basic_streambuf/sputbackc.html">sputbackc</a>(c);</code> と等価である。</li>
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<li>文字 <code>c</code> のストリームへの戻し <code><a href="../../cstdio/ungetc.html">ungetc</a>(c, f)</code> は <code>str.<a href="../basic_ios/rdbuf.html">rdbuf</a>()-&gt;<a href="../../streambuf/basic_streambuf/sputbackc.html">sputbackc</a>(c);</code> と等価である。</li>
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<h2>例</h2>
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<p><div class="yata" id="aafe8e32dd11af331a455eb5f2c61a17e28a1ad1"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../../iostream.html">&lt;iostream&gt;</a></span><span class="cp"></span>
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<span class="p">{</span>
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<span class="n"><a href="../ios_base.html">std::ios_base</a></span><span class="o">::</span><span class="n"><span style="color:#ff0000">sync_with_stdio</span></span><span class="p">(</span><span class="nb">false</span><span class="p">);</span>
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<span class="n"><a href="../../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="sc">'1'</span><span class="p">;</span>
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<span class="n"><span href="https://cpprefjp.github.io/reference/cstdio/putchar.md.nolink">std::putchar</span></span><span class="p">(</span><span class="sc">'2'</span><span class="p">);</span>
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<span class="n"><a href="../../cstdio/putchar.html">std::putchar</a></span><span class="p">(</span><span class="sc">'2'</span><span class="p">);</span>
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<span class="n"><a href="../../iostream/cout.html">std::cout</a></span> <span class="o">&lt;&lt;</span> <span class="sc">'3'</span><span class="p">;</span>
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<span class="n"><span href="https://cpprefjp.github.io/reference/cstdio/putchar.md.nolink">std::putchar</span></span><span class="p">(</span><span class="sc">'4'</span><span class="p">);</span>
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<span class="n"><a href="../../cstdio/putchar.html">std::putchar</a></span><span class="p">(</span><span class="sc">'4'</span><span class="p">);</span>
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<span class="p">}</span>
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</code></pre></div>
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</div></p>

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