https://blue-sky.tech/Recent content in 网站主页 on Blue_Sky蓝天计划Hugo -- gohugo.iozh-cn3465179943@qq.com (Li)3465179943@qq.com (Li)© 2025 嵌入式开发者博客. 保留所有权利.https://blue-sky.tech/notes/c-cpp/c/c%E8%AF%AD%E8%A8%80%E7%A8%8B%E5%BA%8F%E8%AE%BE%E8%AE%A1/p3-%E6%A0%BC%E5%BC%8F%E5%8C%96%E8%BE%93%E5%85%A5%E8%BE%93%E5%87%BA-1/Mon, 01 Jan 0001 00:00:00 +00003465179943@qq.com (Li)https://blue-sky.tech/notes/c-cpp/c/c%E8%AF%AD%E8%A8%80%E7%A8%8B%E5%BA%8F%E8%AE%BE%E8%AE%A1/p3-%E6%A0%BC%E5%BC%8F%E5%8C%96%E8%BE%93%E5%85%A5%E8%BE%93%E5%87%BA-1/<hr> <h1 class="relative group">知识点 <div id="知识点" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#%e7%9f%a5%e8%af%86%e7%82%b9" aria-label="锚点">#</a> </span> </h1> <h2 class="relative group">2.1 <strong>常量, 变量, 整形, 实型, 字符型</strong> <div id="21-常量-变量-整形-实型-字符型" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#21-%e5%b8%b8%e9%87%8f-%e5%8f%98%e9%87%8f-%e6%95%b4%e5%bd%a2-%e5%ae%9e%e5%9e%8b-%e5%ad%97%e7%ac%a6%e5%9e%8b" aria-label="锚点">#</a> </span> </h2> <ul> <li>@ 数据类型图 <ul> <li>![[P1 数据类型.canvas|P1 数据类型]]</li> </ul> </li> </ul> <h3 class="relative group">2.1.2 每种数据类型<strong>所占内存大小及取值范围</strong> <div id="212-每种数据类型所占内存大小及取值范围" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#212-%e6%af%8f%e7%a7%8d%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b%e6%89%80%e5%8d%a0%e5%86%85%e5%ad%98%e5%a4%a7%e5%b0%8f%e5%8f%8a%e5%8f%96%e5%80%bc%e8%8c%83%e5%9b%b4" aria-label="锚点">#</a> </span> </h3> <table> <thead> <tr> <th>数据类型</th> <th>32 位系统（字节）</th> <th>64 位系统</th> <th>最小值</th> <th>最大值</th> </tr> </thead> <tbody> <tr> <td><code>char</code></td> <td>1</td> <td>1</td> <td><code>-128</code></td> <td><code>127</code></td> </tr> <tr> <td><code>short</code></td> <td>2</td> <td>2</td> <td><code>-32767</code></td> <td><code>32768</code></td> </tr> <tr> <td><code>unsigned short</code></td> <td>2</td> <td>2</td> <td><code>0</code></td> <td><code>65536</code></td> </tr> <tr> <td><code>int</code></td> <td>4</td> <td>4</td> <td><code>-2147483648</code></td> <td><code>2147483647</code></td> </tr> <tr> <td><code>unsigned int</code></td> <td>4</td> <td>4</td> <td><code>0</code></td> <td><code>4294967295</code></td> </tr> <tr> <td><code>float</code></td> <td>4</td> <td>4</td> <td></td> <td></td> </tr> <tr> <td><code>double</code></td> <td>8</td> <td>8</td> <td></td> <td></td> </tr> <tr> <td><code>long</code></td> <td>4</td> <td>8</td> <td><code>-2147483648</code></td> <td><code>2147483647</code></td> </tr> <tr> <td><code>long long</code></td> <td>8</td> <td>8</td> <td><code>-9223372036854775807</code></td> <td><code>9223372036854775808</code></td> </tr> <tr> <td><code>unsigned long long</code></td> <td>8</td> <td>8</td> <td><code>0</code></td> <td><code>18446744073709551615</code></td> </tr> </tbody> </table> <h3 class="relative group">2.1.3 常量和变量 <div id="213-常量和变量" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#213-%e5%b8%b8%e9%87%8f%e5%92%8c%e5%8f%98%e9%87%8f" aria-label="锚点">#</a> </span> </h3> <blockquote> <p>[!Note] 常量和变量</p>https://blue-sky.tech/notes/c-cpp/c/c%E8%AF%AD%E8%A8%80%E7%A8%8B%E5%BA%8F%E8%AE%BE%E8%AE%A1/p12-%E6%8C%87%E9%92%88%E5%92%8C%E6%95%B0%E7%BB%84/Thu, 20 Nov 2025 00:00:00 +00003465179943@qq.com (Li)https://blue-sky.tech/notes/c-cpp/c/c%E8%AF%AD%E8%A8%80%E7%A8%8B%E5%BA%8F%E8%AE%BE%E8%AE%A1/p12-%E6%8C%87%E9%92%88%E5%92%8C%E6%95%B0%E7%BB%84/<h2 class="relative group">(这里开始写正文&hellip;) <div id="这里开始写正文" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#%e8%bf%99%e9%87%8c%e5%bc%80%e5%a7%8b%e5%86%99%e6%ad%a3%e6%96%87" aria-label="锚点">#</a> </span> </h2> <h2 class="relative group">created: 2025-11-04T18:16 updated: 2025-11-04T19:16 <div id="updated-2025-11-04t1916" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#updated-2025-11-04t1916" aria-label="锚点">#</a> </span> </h2> <h1 class="relative group">指针的算数运算 <div id="指针的算数运算" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#%e6%8c%87%e9%92%88%e7%9a%84%e7%ae%97%e6%95%b0%e8%bf%90%e7%ae%97" aria-label="锚点">#</a> </span> </h1> <ul> <li>@ 指针的算术运算 <ul> <li>指针加上整数</li> <li>指针减去整数</li> <li>两个指针相减</li> </ul> </li> <li>! 在一个不指向任何数组元素的指针上执行算术运算会导致未定义的行为</li> <li>! <strong>只有在两个指针指向同一个数组时，把他们相减才有意义</strong></li> </ul> <h2 class="relative group">指针加上整数 &amp; 指针减去整数 <div id="指针加上整数--指针减去整数" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#%e6%8c%87%e9%92%88%e5%8a%a0%e4%b8%8a%e6%95%b4%e6%95%b0--%e6%8c%87%e9%92%88%e5%87%8f%e5%8e%bb%e6%95%b4%e6%95%b0" aria-label="锚点">#</a> </span> </h2> <div class="highlight"><pre tabindex="0" class="chroma"><code class="language-c" data-lang="c"><span class="line"><span class="cl"><span class="kt">int</span> <span class="n">a</span><span class="p">[</span><span class="mi">10</span><span class="p">];</span> </span></span><span class="line"><span class="cl"><span class="kt">int</span> <span class="o">*</span><span class="n">p</span> <span class="o">=</span> <span class="o">&amp;</span><span class="n">a</span><span class="p">[</span><span class="mi">0</span><span class="p">];</span> </span></span><span class="line"><span class="cl"><span class="n">p</span> <span class="o">=</span> <span class="n">p</span> <span class="o">+</span> <span class="mi">2</span><span class="p">;</span> <span class="c1">//指针向右移动两个位置 </span></span></span><span class="line"><span class="cl"><span class="c1"></span><span class="n">p</span> <span class="o">=</span> <span class="n">p</span> <span class="o">-</span> <span class="mi">2</span><span class="p">;</span> <span class="c1">//指针向左移动两个位置 </span></span></span></code></pre></div><p>![[Pasted image 20251104182339.png]]</p>https://blue-sky.tech/about/Mon, 01 Jan 0001 00:00:00 +00003465179943@qq.com (Li)https://blue-sky.tech/about/<h1 class="relative group">关于我 <div 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