问题及代码：
【项目-Time类中的运算符重载】
实现Time类中的运算符重载。
<code class="hljs cpp has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> CTime{<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span>: <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">unsigned</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">short</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> hour; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 时</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">unsigned</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">short</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> minute; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 分</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">unsigned</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">short</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> second; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 秒</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span>: CTime(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> h=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>,<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> m=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>,<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> s=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> setTime(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> h,<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> m,<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> s); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> display(); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//二目的比较运算符重载</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">bool</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span> > (CTime &t); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">bool</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span> < (CTime &t); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">bool</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span> >= (CTime &t); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">bool</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span> <= (CTime &t); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">bool</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span> == (CTime &t); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">bool</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span> != (CTime &t); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//二目的加减运算符的重载</span> <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//返回t规定的时、分、秒后的时间</span> <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//例t1(8,20,25),t2(11,20,50)，t1+t2为19:41:15</span> CTime <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span>+(CTime &t); CTime <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span>-(CTime &t);<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//对照+理解</span> CTime <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span>+(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> s);<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//返回s秒后的时间</span> CTime <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span>-(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> s);<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//返回s秒前的时间</span> <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//二目赋值运算符的重载</span> CTime &<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span>+=(CTime &c); CTime &<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span>-=(CTime &c); CTime &<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span>+=(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> s);<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//返回s秒后的时间</span> CTime &<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span>-=(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> s);<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//返回s秒前的时间</span> <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//一目运算符的重载</span> CTime <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span>++(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span>);<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//后置++，下一秒</span> CTime &<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span>++();<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//前置++，下一秒</span> CTime <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span>--( <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span>);<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//后置--，前一秒</span> CTime &<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span>--();<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//前置--，前一秒</span>};</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li></ul>提示1：并不是所有比较运算重载函数都很复杂
<code class="hljs cs has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//比较运算返回的是比较结果，是bool型的true或false</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//可以直接使用已经重载了的运算实现新运算，例如果已经实现了 > ，则实现 <= 就可以很方便了……</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">bool</span> CTime::<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span> <= (CTime &t) <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 判断时间t1<=t2</span>{ <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (*<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span> > t) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">false</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">true</span>;}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>甚至可以如下面的代码般简练：
<code class="hljs cs has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">bool</span> CTime::<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span> <= (CTime &t){<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> !(*<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span> > t)}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>提示2：并不是所有复合赋值运算重载函数都需要很复杂
<code class="hljs cs has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//可以直接使用已经重载了的加减运算实现</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//这种赋值, 例如 t1+=20，直接改变当前对象的值，所以在运算完成后，将*this作为返回值</span>CTime &CTime::<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">operator</span>+=(CTime &c){ *<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>=*<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>+c; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> *<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>;}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>提示3：请自行编制用于测试的main()函数，有些结果不必依赖display()函数，提倡用单步执行查看结果
/* Copyright(c)2016,烟台大学计算机与控制工程学院 All rights reserced 文件名称：test.cpp 作 者：蔡汝佳 完成日期：2016年6月4日 版 本 号：v1.0 问题描述： 输入描述： 程序输出：*/#include <iostream>#include <string>using namespace std;class CTime{private: unsigned short int hour; // 时 unsigned short int minute; // 分 unsigned short int second; // 秒public: CTime(int h=0,int m=0,int s=0); void setTime(int h,int m,int s); void display(); //重载输入输出运算符 friend istream &operator>>(istream &in,CTime &t); friend ostream &operator<<(ostream &out,CTime t); //二目的比较运算符重载 bool operator > (CTime &t); bool operator < (CTime &t); bool operator >= (CTime &t); bool operator <= (CTime &t); bool operator == (CTime &t); bool operator != (CTime &t); //二目的加减运算符的重载 //返回t规定的时、分、秒后的时间 //例t1(8,20,25),t2(11,20,50)，t1+t2为19:41:15 CTime operator+(CTime &t); CTime operator-(CTime &t);//对照+理解 CTime operator+(int s);//返回s秒后的时间 CTime operator-(int s);//返回s秒前的时间 //二目赋值运算符的重载 CTime &operator+=(CTime &c); CTime &operator-=(CTime &c); CTime &operator+=(int s);//返回s秒后的时间 CTime &operator-=(int s);//返回s秒前的时间 //一目运算符的重载 CTime operator++(int);//后置++，下一秒 CTime &operator++();//前置++，下一秒 CTime operator--( int);//后置--，前一秒 CTime &operator--();//前置--，前一秒};//构造函数CTime::CTime(int h,int m,int s){ hour=h; minute=m; second=s;}//设置时间void CTime::setTime(int h,int m,int s){ hour=h; minute=m; second=s;} //二目的比较运算符重载bool CTime::operator > (CTime &t){ if(hour>t.hour)return true; if(hour<t.hour)return false; if(minute>t.minute)return true; if(minute<t.minute)return false; if(second>t.second)return true; return false;}bool CTime::operator < (CTime &t){ if (hour<t.hour) return true; if (hour>t.hour) return false; if (minute<t.minute) return true; if (minute>t.minute) return false; if (second<t.second) return true; return false;}bool CTime::operator == (CTime &t){ if(*this<t||*this>t)return false; return true;}bool CTime::operator >= (CTime &t){ if(*this<t)return false; return true;} bool CTime::operator <= (CTime &t) { if(*this>t)return false; return true; } bool CTime::operator != (CTime &t) { if(*this==t)return false; return true; } //二目的加减运算符的重载CTime CTime::operator+(CTime &t){ int h,m,s; h=hour+t.hour; m=minute+t.minute; s=second+t.second; if(s>59) { s-=60; m++; } if(m>59) { m-=60; h++; } if(h>23) h-=24; CTime t0(h,m,s); return t0;}CTime CTime::operator-(CTime &t)//对照+理解{ int h,m,s; h=hour-t.hour; m=minute-t.minute; s=second-t.second; if(s<0) { s+=60; m--; } if(m<0) { m+=60; h--; } if(h<0) h+=24; CTime t0(h,m,s); return t0;}CTime CTime::operator+(int s)//返回s秒后的时间{ int ss=s%60; int mm=(s/60)%60; int hh=s/3600; CTime t0(hh,mm,ss); return *this+t0;}CTime CTime::operator-(int s)//返回s秒前的时间{ int ss=s%60; int mm=(s/60)%60; int hh=s/3600; CTime t0(hh,mm,ss); return *this-t0;}CTime CTime::operator++(int )//后置++，下一秒{ CTime t; t=*this; *this=*this+1; return t;}CTime &CTime::operator++()//前置++，下一秒{ *this=*this+1; return *this;}CTime CTime::operator--( int)//后置--，前一秒{ CTime t; t=*this; *this=*this-1; return t;}CTime &CTime::operator--()//前置--，前一秒{ *this=*this-1; return *this;}CTime &CTime::operator+=(CTime &c){ *this=*this+c; return *this;}CTime &CTime::operator-=(CTime &c){ *this=*this-c; return *this;}CTime &CTime::operator+=(int s)//返回s秒后的时间{ *this=*this+s; return *this;}CTime &CTime::operator-=(int s)//返回s秒前的时间{ *this=*this-s; return *this;}istream &operator>>(istream &in,CTime &t){ char ch1,ch2; while(1) { cout<<"请输入时间（hh:mm:ss）"<<endl; cin>>t.hour>>ch1>>t.minute>>ch2>>t.second; if(ch1==':'&&ch2==':') if(t.hour>-1&&t.hour<24&&t.minute>1&&t.minute<60&&t.second>-1&&t.second<60) break; cerr<<"时间格式输入错误！"<<endl; } return cin;}ostream &operator<<(ostream &out,CTime t){ cout<<t.hour<<":"<<t.minute<<":"<<t.second<<endl; return out;}int main(){ CTime t1,t2,t; cout<<"t1为："; cin>>t1; cout<<"t2为："; cin>>t2; cout<<"下面比较两个时间大小：\n"; if (t1>t2) cout<<"t1>t2"<<endl; if (t1<t2) cout<<"t1<t2"<<endl; if (t1==t2) cout<<"t1＝t2"<<endl; if (t1!=t2) cout<<"t1≠t2"<<endl; if (t1>=t2) cout<<"t1≥t2"<<endl; if (t1<=t2) cout<<"t1≤t2"<<endl; cout<<endl; cout<<"t1= "<<t1<<endl; cout<<"t2= "<<t2<<endl; cout<<"t=t1++"<<endl; t=t1++; cout<<"t= "<<t<<" t1= "<<t1<<endl; cout<<"t=++t1"<<endl; t=++t1; cout<<"t= "<<t<<" t1= "<<t1<<endl; cout<<"t1+t2= "<<t1+t2<<endl; cout<<"t1-t2= "<<t1-t2<<endl; cout<<"t1+2000= "<<t1+2000<<endl; cout<<"t1-5000= "<<t1-5000<<endl; return 0;}运行结果：
知识点总结：
运算符重载
学习心得：
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