CTime类——运算符重载（大折腾）

/*【项目2-Time类中的运算符重载】实现CTime类中的运算符重载(大折腾)* 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  * All rightsreserved.* 文件名称： object.cpp* 攻城菜鸟：蛋蛋* 完成日期： 2013年  4 月  24 日* 版本号： v1.0* 输入描述：初始化后的t1，t2，及定义的t3* 问题描述：一目二目运算符重载* 程序输出：使用运算符运算的结果* 操作感悟：有点折腾人，运行结果老是不对的，最终终于倒腾明白了。*/#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);    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:41:15    CTime 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，前置与后置返回值不一样    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);    CTime operator-=(int s);};//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CTime::CTime(int h,int m,int s){hour=h;minute=m;second=s;}void CTime::setTime(int h,int m,int s){hour=h;minute=m;second=s;}void CTime::display(){cout<<hour<<":"<<minute<<":"<<second<<endl;}//比较运算符(二目)的重载bool CTime::operator > (CTime &t){if(hour>t.hour)return true;else if(hour==t.hour&&minute>t.minute)return true;else if(hour==t.hour&&minute==t.minute&&second>t.second)return true;else return false;}bool CTime::operator < (CTime &t){if(hour<t.hour)return true;else if(hour==t.hour&&minute<t.minute)return true;else if(hour==t.hour&&minute==t.minute&&second<t.second)return true;else return false;}bool CTime::operator >= (CTime &t){if(hour>t.hour)return true;else if(hour==t.hour && minute>t.minute)return true;else if(hour==t.hour && minute==t.minute && second>t.second)return true;else if(hour==t.hour && minute==t.minute && second==t.second)return true;else  return false;}bool CTime::operator <= (CTime &t){if(hour<t.hour)return true;else if(hour==t.hour&&minute<t.minute)return true;else if(hour==t.hour&&minute==t.minute&&second<t.second)return true;else if(hour==t.hour&&minute==t.minute&&second==t.second)return true;else return false;}bool CTime::operator == (CTime &t){if(hour==t.hour&&minute==t.minute&&second==t.second)return true;else return false;}bool CTime::operator != (CTime &t){if(hour!=t.hour||minute!=t.minute||second!=t.second)return true;else return false;}//二目运算符的重载CTime CTime::operator+(CTime &c){CTime t;t.hour=hour+c.hour;t.minute=minute+c.minute;t.second=second+c.second;if(t.second>=60){t.second=t.second-60;t.minute=t.minute+1;if(t.minute>=60){t.minute=t.minute-60;t.hour=t.hour+1;if(t.hour>=24)t.hour=t.hour-24;}}return t;}CTime CTime::operator-(CTime &c){CTime t;t.hour=hour-c.hour;t.minute=minute-c.minute;t.second=second-c.second;if(t.second<0){t.second=t.second+60;t.minute=t.minute-1;}if(t.minute<0){t.minute=t.minute+60;t.hour=t.hour-1;}if(t.hour<0)t.hour=t.hour+24;return t;}CTime CTime::operator+(int s){CTime t;t.second=t.second+s;if(t.second>=60){t.second=t.second-60;t.minute=t.minute+1;if(t.minute>=60){t.minute=t.minute-60;t.hour=t.hour+1;if(t.hour>=24)t.hour=t.hour-24;}}return t;}CTime CTime::operator-(int s){CTime t;t.second=t.second-s;if(t.second<0){t.second=t.second+60;t.minute=t.minute-1;}if(t.minute<0){t.minute=t.minute+60;t.hour=t.hour-1;}return t;}CTime CTime::operator++( int ){CTime t(*this);second++;if(second>=60){second=second-60;minute=minute+1;}return t;}CTime CTime::operator++(){second++;if(second>=60){second=second-60;minute=minute+1;}return *this;}CTime CTime::operator--( int){CTime t(*this);second--;if(second<0){second=second+60;minute=minute-1;}return t;}CTime CTime::operator--(){second--;if(second<0){second=second+60;minute=minute-1;}return *this;}//赋值运算符的重载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){second=second+s;if(second>=60){second=second-60;minute=minute+1;if(minute>=60){minute=minute-60;hour=hour+1;if(hour>=24)hour=hour-24;}}return CTime(hour,minute,second);}CTime CTime::operator-=(int s){second=second-s;if(second<0){second=second+60;minute=minute-1;if(minute<0){minute=minute+60;hour=hour-1;if(hour<0)hour=hour+24;}}return CTime(hour,minute,second);}int main(){    CTime t1(8,20,25),t2(11,20,50),t3,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;    //下面自行设计对其他运算符的重载的测试    cout<<endl;cout<<"两项相加之后"<<endl;t=t1+t2;t.display();cout<<"两项相减之后"<<endl;t=t2-t1;t.display();cout<<"时间加加之后的景象t1++="<<endl;t=t1++;t.display();cout<<"++t1="<<endl;t=++t1;t.display();cout<<"时间减减t2--="<<endl;t=t2--;t.display();cout<<"--t2="<<endl;t=--t2;t.display();cout<<"+=的应用t2=t2+2="<<endl;t2+=2;t2.display();cout<<"-=的应用t2=t2-2="<<endl;t2-=2;t2.display();t3.setTime(1,2,3);cout<<"加上的应用t3=t3+t1="<<endl;t3+=t1;t3.display();cout<<"减去的应用t2=t2-t1="<<endl;t2-=t1;t2.display();return 0;}