172 lines
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GCC+MinGW-w64 compiler for Windows</a>下载你需要的版本<br>解压到<code>D:\ProgramModule</code>，并将 <code>bin\</code>加入环境变量<code>PATH</code><br>打开新的<code>Terminal</code>输入<code>gcc -v</code>，查看<code>gcc</code>是否安装成功<br>在<code>VS code</code> 的插件管理下载<code>Code Runner</code>、<code>C\C++</code>这两个插件<br>在<code>*.c</code>源文件的内容区，右键点击<code>Run Code</code> ，即可运行成功<br><img src="/img/language/c-env-conf.png"></p>
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<h3 id="数据类型"><a href="#数据类型" class="headerlink" title="数据类型"></a>数据类型</h3><ul>
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<li>整数类型<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"> <span class="type">short</span> a = <span class="number">12</span>;</span><br><span class="line"> <span class="type">int</span> b = <span class="number">100</span>;</span><br><span class="line"> <span class="type">long</span> c = <span class="number">1000L</span>;</span><br><span class="line"> <span class="type">long</span> <span class="type">long</span> d = <span class="number">1000000LL</span>;</span><br><span class="line"> <span class="type">unsigned</span> <span class="type">int</span> e = <span class="number">10</span>;</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"a: %hd\n"</span>,a);</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"b: %d\n"</span>,b);</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"c: %ld\n"</span>,c);</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"d: %lld\n"</span>,d);</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"e: %u\n"</span>,e);</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"f: %.3f\n"</span>,f);</span><br></pre></td></tr></table></figure></li>
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<li>小数类型<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">float</span> f = <span class="number">3.14F</span>;</span><br><span class="line"><span class="built_in">printf</span>(<span class="string">"f: %.3f\n"</span>,f);</span><br><span class="line"><span class="type">double</span> g = <span class="number">5.65</span>;</span><br><span class="line"><span class="built_in">printf</span>(<span class="string">"g: %.2lf\n"</span>,g);</span><br></pre></td></tr></table></figure></li>
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<li>字符类型<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">char</span> h = <span class="string">'x'</span>;</span><br><span class="line"><span class="built_in">printf</span>(<span class="string">"x: %c\n"</span>,x);</span><br></pre></td></tr></table></figure></li>
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</ul>
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<h3 id="类型转换"><a href="#类型转换" class="headerlink" title="类型转换"></a>类型转换</h3><ul>
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<li>隐式转换</li>
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<li>强制转换<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">int</span> b = <span class="number">23</span>;</span><br><span class="line"><span class="type">short</span> c = (<span class="type">short</span>) b;</span><br></pre></td></tr></table></figure></li>
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</ul>
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<h3 id="数组"><a href="#数组" class="headerlink" title="数组"></a>数组</h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string"><stdio.h></span></span></span><br><span class="line"></span><br><span class="line"><span class="type">int</span> <span class="title function_">main</span><span class="params">()</span>{</span><br><span class="line"> <span class="type">int</span> arr [<span class="number">10</span>] = {<span class="number">2</span>,<span class="number">3</span>,<span class="number">4</span>,<span class="number">5</span>,<span class="number">6</span>,<span class="number">7</span>,<span class="number">8</span>,<span class="number">9</span>,<span class="number">10</span>,<span class="number">11</span>};</span><br><span class="line"> arr[<span class="number">0</span>] = <span class="number">1525</span>;</span><br><span class="line"> *(arr+<span class="number">1</span>) = <span class="number">25</span>;</span><br><span class="line"> <span class="type">int</span> len = <span class="keyword">sizeof</span>(arr)/<span class="keyword">sizeof</span>(arr[<span class="number">0</span>]);</span><br><span class="line"> <span class="type">void</span> <span class="title function_">printArr</span><span class="params">(<span class="type">int</span> arr[], <span class="type">int</span> len)</span>{</span><br><span class="line"> <span class="keyword">for</span> (<span class="type">int</span> i = <span class="number">0</span>; i < len;i++){</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"%d\t"</span>,arr[i]);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> printArr(arr,len);</span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<h3 id="指针"><a href="#指针" class="headerlink" title="指针"></a>指针</h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// swap the value of a and b</span></span><br><span class="line"> <span class="type">void</span> <span class="title function_">swap</span><span class="params">(<span class="type">int</span>* x, <span class="type">int</span>* y)</span>{</span><br><span class="line"> <span class="type">int</span> temp = *x;</span><br><span class="line"> *x = *y;</span><br><span class="line"> *y = temp;</span><br><span class="line"></span><br><span class="line"> }</span><br><span class="line"> <span class="type">int</span> a = <span class="number">5</span>;</span><br><span class="line"> <span class="type">int</span> b = <span class="number">10</span>;</span><br><span class="line"> swap(&a, &b);</span><br><span class="line"> <span class="built_in">printf</span>(<span class="string">"a = %d b = %d\n"</span>, a, b);</span><br></pre></td></tr></table></figure>
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