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<table class="style-list"><thead><tr><th>宏</th><th>描述</th></tr></thead><tbody><tr><td><code>__DATE__</code></td><td>当前日期，一个以 "MMM DD YYYY" 格式表示的字符常量</td></tr><tr><td><code>__TIME__</code></td><td>当前时间，一个以 "HH:MM:SS" 格式表示的字符常量</td></tr><tr><td><code>__FILE__</code></td><td>这会包含当前文件名，一个字符串常量</td></tr><tr><td><code>__LINE__</code></td><td>这会包含当前行号，一个十进制常量</td></tr><tr><td><code>__STDC__</code></td><td>当编译器以 <code>ANSI</code> 标准编译时，则定义为 <code>1</code></td></tr></tbody></table>
<!--rehype:className=style-list-->
<p><code>ANSI C</code> 定义了许多宏，您可以使用这些宏，但是不能直接修改这些预定义的宏</p>
</div></div><div class="h3wrap-body"><div class="wrap h4body-not-exist"><div class="wrap-header h4wrap"><h4 id="预定义宏示例"><a aria-hidden="true" tabindex="-1" href="#预定义宏示例"><span class="icon icon-link"></span></a>预定义宏示例</h4><div class="wrap-body">
</div></div><div class="h3wrap-body"><h4 id="预定义宏示例"><a aria-hidden="true" tabindex="-1" href="#预定义宏示例"><span class="icon icon-link"></span></a>预定义宏示例</h4>
<pre class="language-c"><code class="language-c code-highlight"><span class="code-line"><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string">&#x3C;stdio.h></span></span>
</span><span class="code-line">
</span><span class="code-line"><span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
@ -989,7 +989,7 @@
</span><span class="code-line"> <span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"ANSI :%d\n"</span><span class="token punctuation">,</span> __STDC__<span class="token punctuation">)</span><span class="token punctuation">;</span>
</span><span class="code-line"><span class="token punctuation">}</span>
</span></code></pre>
</div></div></div></div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="宏延续运算符"><a aria-hidden="true" tabindex="-1" href="#宏延续运算符"><span class="icon icon-link"></span></a>宏延续运算符（\）</h3><div class="wrap-body">
</div></div><div class="wrap h3body-not-exist"><div class="wrap-header h3wrap"><h3 id="宏延续运算符"><a aria-hidden="true" tabindex="-1" href="#宏延续运算符"><span class="icon icon-link"></span></a>宏延续运算符（\）</h3><div class="wrap-body">
<p>一个宏通常写在一个单行上。</p>
<pre class="language-c"><code class="language-c code-highlight"><span class="code-line"><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">define</span> <span class="token macro-name function">message_for</span><span class="token expression"><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span> </span><span class="token punctuation">\</span>
</span></span><span class="code-line"><span class="token macro property"> <span class="token expression"><span class="token function">printf</span><span class="token punctuation">(</span>#a </span><span class="token string">" 和 "</span> <span class="token expression"><span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">b</span> </span></span><span class="token string">": 我们爱你！\n"</span><span class="token expression"><span class="token punctuation">)</span></span></span>