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<h3 id="成员调用"><a href="#成员调用" class="headerlink" title="成员调用"></a>成员调用</h3><ol>
<li>栈区对象 对象.成员</li>
<li>堆区指针对象 对象->成员</li>
<li>类的所有成员(个别特殊static) 必须通过对象访问</li>
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<figure class="highlight c++"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div></pre></td><td class="code"><pre><div class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><iostream></span></span></div><div class="line"><span class="keyword">using</span> <span class="keyword">namespace</span> <span class="built_in">std</span>;</div><div class="line"></div><div class="line"><span class="class"><span class="keyword">class</span> <span class="title">CPeople</span></span></div><div class="line"><span class="class">{</span></div><div class="line"><span class="keyword">public</span>:</div><div class="line"> <span class="keyword">int</span> age;</div><div class="line"> <span class="function"><span class="keyword">void</span> <span class="title">fun</span><span class="params">()</span></span></div><div class="line"><span class="function"> </span>{</div><div class="line"> <span class="built_in">cout</span> << <span class="string">"age:"</span> << age << <span class="built_in">endl</span>;</div><div class="line"> }</div><div class="line">};</div><div class="line"></div><div class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">()</span></span></div><div class="line"><span class="function"></span>{</div><div class="line"> <span class="comment">//常规调用</span></div><div class="line"> CPeople op;</div><div class="line"> op.age = <span class="number">22</span>;</div><div class="line"> op.fun();</div><div class="line"></div><div class="line"> <span class="built_in">cout</span> << <span class="string">"---------------------"</span> << <span class="built_in">endl</span>;</div><div class="line"> <span class="comment">//指针调用</span></div><div class="line"> CPeople *p = <span class="keyword">new</span> CPeople;</div><div class="line"> p->age = <span class="number">33</span>;</div><div class="line"> p->fun();</div><div class="line"></div><div class="line"> system(<span class="string">"pause"</span>);</div><div class="line"> <span class="keyword">return</span> <span class="number">0</span>;</div><div class="line">}</div></pre></td></tr></table></figure>
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<h2 id="函数的默认值"><a href="#函数的默认值" class="headerlink" title="函数的默认值"></a>函数的默认值</h2><figure class="highlight c++"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div></pre></td><td class="code"><pre><div class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><iostream></span></span></div><div class="line"><span class="keyword">using</span> <span class="keyword">namespace</span> <span class="built_in">std</span>;</div><div class="line"></div><div class="line"></div><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment">给函数设置默认值</span></div><div class="line"><span class="comment">*/</span></div><div class="line"><span class="function"><span class="keyword">void</span> <span class="title">fun</span><span class="params">(<span class="keyword">int</span> a = <span class="number">12</span>, <span class="keyword">char</span> b = <span class="string">'c'</span>)</span></span></div><div class="line"><span class="function"></span>{</div><div class="line"> <span class="built_in">cout</span> << <span class="string">"fun a:"</span> << a << <span class="built_in">endl</span>;</div><div class="line">}</div><div class="line"></div><div class="line"></div><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment">函数申明 在此处指定默认值</span></div><div class="line"><span class="comment">*/</span></div><div class="line"><span class="function"><span class="keyword">void</span> <span class="title">fun1</span><span class="params">(<span class="keyword">int</span> a, <span class="keyword">char</span> b = <span class="string">'c'</span>, <span class="keyword">float</span> f = <span class="number">123.123</span>)</span></span>;</div><div class="line"></div><div class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">()</span></span></div><div class="line"><span class="function"></span>{</div><div class="line"> <span class="comment">//函数调用:有默认值的参数可以不用传递实参</span></div><div class="line"> fun();</div><div class="line"> <span class="comment">//没指定默认值的，一定要传递实参</span></div><div class="line"> fun1(<span class="number">123</span>);</div><div class="line"> <span class="comment">//如果有默认值，传递实参，实参会覆盖默认值</span></div><div class="line"> fun(<span class="number">124124</span>);</div><div class="line"> system(<span class="string">"pause"</span>);</div><div class="line"> <span class="keyword">return</span> <span class="number">0</span>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment">给函数设置默认值 从右向左连续指定 不可断续指定</span></div><div class="line"><span class="comment">*/</span></div><div class="line"><span class="function"><span class="keyword">void</span> <span class="title">fun1</span><span class="params">(<span class="keyword">int</span> a, <span class="keyword">char</span> b , <span class="keyword">float</span> f)</span></span></div><div class="line"><span class="function"></span>{</div><div class="line"> <span class="built_in">cout</span> << <span class="string">"fun1 a:"</span> << a << <span class="built_in">endl</span>;</div><div class="line">}</div></pre></td></tr></table></figure>
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<h2 id="struct"><a href="#struct" class="headerlink" title="struct"></a>struct</h2><p>在C中的<code>struct</code>中不能放函数，在使用这个<code>struct</code>的使用必须要使用<code>strcut::{函数名}</code>才能编译通过，但是在C++中可以直接使用，</p>
<p>如果想在C的结构体中使用函数我们可以使用指针<br><figure class="highlight c"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div></pre></td><td class="code"><pre><div class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><stdio.h></span></span></div><div class="line"></div><div class="line"><span class="class"><span class="keyword">struct</span> <span class="title">Node</span></span></div><div class="line"><span class="class">{</span></div><div class="line"> <span class="keyword">int</span> m;</div><div class="line"> <span class="keyword">void</span> (*p)();</div><div class="line">};</div><div class="line"></div><div class="line"><span class="function"><span class="keyword">void</span> <span class="title">fun</span><span class="params">()</span></span></div><div class="line"><span class="function"></span>{</div><div class="line"> <span class="built_in">printf</span>(<span class="string">"hello \n"</span>);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">(<span class="keyword">void</span>)</span></span></div><div class="line"><span class="function"></span>{</div><div class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">Node</span> <span class="title">a</span> = {</span><span class="number">1</span>, fun};</div><div class="line"> a.p();</div><div class="line"> <span class="keyword">return</span> <span class="number">0</span>;</div><div class="line">}</div></pre></td></tr></table></figure></p>
<p>在结构体中定义指针然后指向我们外面的函数，而在C++中就可以直接调用<br>
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<p>在Android开发中我们差不多都是用java来进行数据处理和算法等等…<br>在过去的一段时间里我萌生了一种想法，如果我们的Android数据库和网络请求都放置在C++里，java只是负责UI的显示，数据和计算全部由C++提供。<br>在大学的时候就学习过C++编程但是年代久远现在完全忘记了，现在是在网上找的教学视屏来复习</p>
<p><strong>第一个Demo</strong><br><figure class="highlight c++"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><iostream></span></span></div><div class="line"><span class="keyword">using</span> <span class="keyword">namespace</span> <span class="built_in">std</span>;</div><div class="line"></div><div class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">()</span> </span>{</div><div class="line"></div><div class="line"> <span class="built_in">cout</span> << <span class="string">"hello world"</span> << <span class="built_in">endl</span>;</div><div class="line"> system(<span class="string">"pause"</span>);</div><div class="line"> <span class="keyword">return</span> <span class="number">0</span>;</div><div class="line">}</div></pre></td></tr></table></figure></p>
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