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‎reference/cstdio.html

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最終更新日時(UTC):
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<span itemprop="datePublished" content="2025-07-05T04:01:46">
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2025年07月05日 04時01分46秒
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<span itemprop="datePublished" content="2025-07-05T06:31:50">
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<td></td>
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<tr>
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<td><code><span href="https://cpprefjp.github.io/reference/cstdio/file.md.nolink">FILE</span></code></td>
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<td><code><a href="cstdio/file.html">FILE</a></code></td>
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<td>ストリームの制御に必要な情報を持つオブジェクト型</td>
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<td></td>
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‎reference/cstdio/file.html

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<div class="identifier-type">class</div><div class="header">&lt;cstdio&gt;</div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">FILE</span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">typedef</span> <span class="cm">/* unspecified */</span> <span class="kt">FILE</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><code>FILE</code>型は、ストリームの制御に必要な情報を持つオブジェクト型である。</p>
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<p><code>FILE</code>型のオブジェクトは、完全な型であることが保証されていない。つまり、コピーをしたときの動作は不定である（<a class="cpprefjp-defined-word" data-desc="未定義の動作。処理系は予期せぬ動作をする可能性がある。要するに動作保証対象外。undefined behavior (UB)。" href="../../implementation-compliance.html#dfn-undefined-behavior">未定義動作</a>ではない）。</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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‎reference/cstdio/fprintf.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="2025-07-04T14:49:05">
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2025年07月04日 14時49分05秒
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<span itemprop="datePublished" content="2025-07-05T06:31:50">
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<span class="kt">int</span> <span class="n">n</span> <span class="o">=</span> <span class="mi">123</span><span class="p">;</span>
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<span class="n"><span style="color:#ff0000">std::fprintf</span></span><span class="p">(</span><span class="n">stdout</span><span class="p">,</span> <span class="s">"Hello, World!</span><span class="se">\n</span><span class="s">%d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">n</span><span class="p">);</span>
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<span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">path</span> <span class="o">=</span> <span class="s">"test.txt"</span><span class="p">;</span>
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<span class="n"><span href="https://cpprefjp.github.io/reference/cstdio/file.md.nolink">std::FILE</span></span><span class="o">*</span> <span class="n">fp</span> <span class="o">=</span> <span class="n"><span href="https://cpprefjp.github.io/reference/cstdio/fopen.md.nolink">std::fopen</span></span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="s">"w"</span><span class="p">);</span>
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<span class="n"><a href="file.html">std::FILE</a></span><span class="o">*</span> <span class="n">fp</span> <span class="o">=</span> <span class="n"><span href="https://cpprefjp.github.io/reference/cstdio/fopen.md.nolink">std::fopen</span></span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="s">"w"</span><span class="p">);</span>
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<span class="n"><span style="color:#ff0000">std::fprintf</span></span><span class="p">(</span><span class="n">fp</span><span class="p">,</span> <span class="s">"Hello, World!</span><span class="se">\n</span><span class="s">%d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">n</span><span class="p">);</span>
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<span class="n"><span href="https://cpprefjp.github.io/reference/cstdio/fclose.md.nolink">std::fclose</span></span><span class="p">(</span><span class="n">fp</span><span class="p">);</span>
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<span class="p">}</span>

‎reference/cstdio/fscanf.html

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最終更新日時(UTC):
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<span itemprop="datePublished" content="2025-07-04T14:51:05">
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2025年07月04日 14時51分05秒
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<span itemprop="datePublished" content="2025-07-05T06:31:50">
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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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="kt">int</span> <span class="n">n</span><span class="p">;</span>
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<span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">path</span> <span class="o">=</span> <span class="s">"test.txt"</span><span class="p">;</span>
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<span class="n"><span href="https://cpprefjp.github.io/reference/cstdio/file.md.nolink">std::FILE</span></span><span class="o">*</span> <span class="n">fp</span> <span class="o">=</span> <span class="n"><span href="https://cpprefjp.github.io/reference/cstdio/fopen.md.nolink">std::fopen</span></span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="s">"r"</span><span class="p">);</span>
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<span class="n"><a href="file.html">std::FILE</a></span><span class="o">*</span> <span class="n">fp</span> <span class="o">=</span> <span class="n"><span href="https://cpprefjp.github.io/reference/cstdio/fopen.md.nolink">std::fopen</span></span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="s">"r"</span><span class="p">);</span>
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<span class="n"><span style="color:#ff0000">std::fscanf</span></span><span class="p">(</span><span class="n">fp</span><span class="p">,</span> <span class="s">"%d"</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">n</span><span class="p">);</span>
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<span class="n"><span href="https://cpprefjp.github.io/reference/cstdio/fclose.md.nolink">std::fclose</span></span><span class="p">(</span><span class="n">fp</span><span class="p">);</span>
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<span class="n">std</span><span class="o">::</span><span class="n">printf</span><span class="p">(</span><span class="s">"%d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">n</span><span class="p">);</span>

‎reference/print/print.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="2025-07-04T14:55:38">
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2025年07月04日 14時55分38秒
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<span itemprop="datePublished" content="2025-07-05T06:31:50">
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2025年07月05日 06時31分50秒
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</span>
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<br/>
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<span itemprop="author" itemscope itemtype="http://schema.org/Person">
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<span class="n">Args</span><span class="o">&amp;&amp;</span><span class="p">...</span> <span class="n">args</span><span class="p">);</span> <span class="c1">// (1) C++23</span>
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<span class="k">template</span> <span class="o">&lt;</span><span class="n">class</span><span class="p">...</span> <span class="n">Args</span><span class="o">&gt;</span>
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<span class="kt">void</span> <span class="n">print</span><span class="p">(</span><span class="n"><span href="https://cpprefjp.github.io/reference/cstdio/file.md.nolink">FILE</span></span><span class="o">*</span> <span class="n">stream</span><span class="p">,</span>
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<span class="kt">void</span> <span class="n">print</span><span class="p">(</span><span class="n"><a href="../cstdio/file.html">FILE</a></span><span class="o">*</span> <span class="n">stream</span><span class="p">,</span>
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<span class="n"><a href="../format/basic_format_string.html">format_string</a></span><span class="o">&lt;</span><span class="n">Args</span><span class="p">...</span><span class="o">&gt;</span> <span class="n">fmt</span><span class="p">,</span>
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<span class="n">Args</span><span class="o">&amp;&amp;</span><span class="p">...</span> <span class="n">args</span><span class="p">);</span> <span class="c1">// (2) C++23</span>
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<span class="p">}</span>
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<p>この関数は、<code><span href="https://cpprefjp.github.io/reference/cstdio/printf.md.nolink">std::printf()</span></code>関数ライクな書式指定で引数を文字列化して出力する。</p>
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<ul>
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<li>(1) : 標準出力に、書式指定で出力する</li>
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<li>(2) : 指定された<code><span href="https://cpprefjp.github.io/reference/cstdio/file.md.nolink">FILE</span></code>に、書式指定で出力する</li>
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<li>(2) : 指定された<code><a href="../cstdio/file.html">FILE</a></code>に、書式指定で出力する</li>
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</ul>
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<p>この関数は、末尾に改行コードが付かないことに注意。改行コードを自動で付けたい場合は、<code><a href="println.html">std::println()</a></code>関数を使用すること。</p>
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<p><code><a href="../ostream/basic_ostream.html">std::ostream</a></code>から派生したクラスオブジェクトに対して出力したい場合は、<code><a href="../ostream.html">&lt;ostream&gt;</a></code>ヘッダの<code><a href="../ostream/print.html">std::print()</a></code>関数を使用すること。</p>

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