第八周实验报告（2）

* 程序头部注释开始
* 程序的版权和版本声明部分
* Copyright (c) 2012, 烟台大学计算机学院学生 
* Copyright (c) 2012, 烟台大学计算机学院学生 
* All rights reserved.
* 文件名称：      Time类 运算符重载                    
* 作    者：        李瑞                   
* 完成日期：  2012 年4  月 10日
* 版 本 号：        v1.0
* 对任务及求解方法的描述部分
* 输入描述：…… 
* 问题描述：…… 
* 程序输出：……

* 程序头部的注释结束

#include <iostream>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):hour(h), minute(m), second(s){}void setTime(int h, int m, int s);void display();//比较运算符(二目)的重载bool operator >  (CTime &t);bool operator <  (CTime &t);bool operator >= (CTime &t);bool operator <= (CTime &t);bool operator == (CTime &t);bool operator != (CTime &t);//二目运算符的重载CTime operator + (CTime &c);//返回c所规定的时、分、秒后的时间，例t1(8,20,25),t2(11,20,50)，t1+t2为:41:15CTime operator - (CTime &c);//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//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//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};//下面实现所有的运算符重载代码。//为简化编程，请注意通过调用已有函数，利用好各函数之间的关系void CTime::setTime(int h, int m, int s){hour = h;minute = m;second = s;}void CTime::display(){cout << hour << ":" << minute << ":"  << second << endl;}bool CTime::operator > (CTime &t){if(hour * 3600 + minute * 60 + second > t.hour * 3600 + t.minute * 60 + t.second)  //将时间统一成 秒 单位.{return true;                                                             //更方便比较。以下相同处理。}else{return false;}}bool CTime::operator < (CTime &t){if(hour * 3600 + minute * 60 + second < t.hour * 3600 + t.minute * 60 + t.second){return true;}else{return false;}}bool CTime::operator >= (CTime &t){if(hour * 3600 + minute * 60 + second >= t.hour * 3600 + t.minute * 60 + t.second){return true;}else{return false;}}bool CTime::operator <= (CTime &t){if(hour * 3600 + minute * 60 + second <= t.hour * 3600 + t.minute * 60 + t.second){return true;}else{return false;}}bool CTime::operator == (CTime &t){if(hour * 3600 + minute * 60 + second == t.hour * 3600 + t.minute * 60 + t.second){return true;}else{return false;}}bool CTime::operator != (CTime &t){if(hour * 3600 + minute * 60 + second != t.hour * 3600 + t.minute * 60 + t.second){return true;}else{return false;}}CTime CTime::operator + (CTime &c){CTime c2;int time;time = (hour * 3600 + minute * 60 + second) + (c.hour * 3600 + c.minute * 60 + c.second);c2.hour = time / 3600;time = time % 3600;c2.minute = time / 60;time = time % 60;c2.second = time;return c2;}CTime CTime::operator - (CTime &c){CTime c2;int time;time = (hour * 3600 + minute * 60 + second) - (c.hour * 3600 + c.minute * 60 + c.second);c2.hour = time / 3600;time = time % 3600;c2.minute = time / 60;time = time % 60;c2.second = time;return c2;}CTime CTime::operator + (int s){int time = hour * 3600 + minute * 60 + second + s;hour = time / 3600;time = time % 3600;minute = time / 60;time = time % 60;second = time;  return (*this);}  CTime CTime::operator - (int s){int time = hour * 3600 + minute * 60 + second;time = time - s;hour = time / 3600;time = time % 3600;minute = time / 60;time = time % 60;second = time;return (*this);}CTime CTime::operator ++ (int) {CTime temp = (*this);int time = hour * 3600 + minute * 60 + second + 1;hour = time / 3600;time = time % 3600;minute = time / 60;time = time % 60;second = time;return temp;}CTime CTime::operator ++ (){int time = hour * 3600 + minute * 60 + second +1;hour = time / 3600;time = time % 3600;minute = time / 60;time = time % 60;second = time;return (*this);}CTime CTime::operator -- (int){CTime temp = (*this);(*this) = (*this) - 1;return temp;}CTime CTime::operator -- (){(*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){CTime c2;c2 = (*this) + s;return c2;}CTime CTime::operator -= (int s){CTime c2;c2 = (*this) - s;return c2;}void main(){CTime t1(8,20,25), t2(11,20,50), t;cout << "t1为：";t1.display();cout << "t2为：";t2.display();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;t = t1 + t2;cout << "t1 + t2 =";t.display();t = t2 - t1;cout << "t2 - t1 =";t.display();t = t1;t = t + 40;cout << "t1 + 40s =";t.display();t = t2;t = t - 10;cout << "t2 - 10s =";t.display();t = t1++;cout << "t1++ =";t.display();t = --t2;cout << "--t2 =";t.display();t = t1;t += t2;cout << "t1 += t2 , t1 = ";t.display();t = t1;t -= 5;cout << "t1 -= 5, t1 = ";t.display();system("pause");}

运行结果：

感言：

这个在定义 比较运算符(二目)的重载 bool 型函数的时候 把时间统一成秒，对后面的函数也会方便和提供思路。