Time类中运算符重载

/** 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* 作者：赵  洋* 完成日期： 2013年4 月19  日* 版本号： v1.0* 输入描述：无* 问题描述：通过重载运算符实现时间处理* 程序输出：*/#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:41:15CTime 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，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;}bool CTime::operator > (CTime &t){    if(hour*3600+minute*60+second >t.hour*3600+t.minute*60+t.second){return true;}elsereturn false;}bool CTime::operator < (CTime &t){    if(hour*3600+minute*60+second <t.hour*3600+t.minute*60+t.second){return true;}elsereturn false;}bool CTime::operator >= (CTime &t){    if(hour*3600+minute*60+second >=t.hour*3600+t.minute*60+t.second){return true;}elsereturn false;}bool CTime::operator <= (CTime &t){    if(hour*3600+minute*60+second <=t.hour*3600+t.minute*60+t.second){return true;}elsereturn false;}bool CTime::operator == (CTime &t){    if(hour==t.hour&&minute==t.minute&&second==t.second){return true;}elsereturn false;}bool CTime::operator != (CTime &t){    if(hour!=t.hour&&minute!=t.minute&&second!=t.second){return true;}elsereturn false;}CTime CTime::operator+(CTime &c){    CTime t1;int time;time = hour*3600+minute*60+second+(c.hour*3600+c.minute*60+c.second);t1.hour=time/3600;if(t1.hour>=24)    {        t1.hour-=24;    }time =time%3600;t1.minute =time/60;time = time%60;t1.second =time;return t1;}CTime CTime::operator-(CTime &c){    CTime t1;int time;time = hour*3600+minute*60+second-(c.hour*3600+c.minute*60+c.second);if(time<0){time = -time;}t1.hour=time/3600;if(t1.hour>=24)    {        t1.hour-=24;    }time =time%3600;t1.minute =time/60;time = time%60;t1.second =time;return t1;}CTime CTime::operator+(int s){    CTime t1;    int time;    time=hour*3600+minute*60+second+s;    t1.hour=time/3600;    if(t1.hour>=24)    {        t1.hour-=24;    }time =time%3600;t1.minute =time/60;time = time%60;t1.second =time;return t1;}CTime CTime::operator-(int s){    CTime t1;    int time;    time=hour*3600+minute*60+second-s;    t1.hour=time/3600;    if(t1.hour>=24)    {        t1.hour-=24;    }time =time%3600;t1.minute =time/60;time = time%60;t1.second =time;return t1;}CTime CTime::operator++( int){    CTime t1;while(second>=60){second-=60;++minute;}while(minute>=60){minute-=60;++hour;}while(hour>23){hour-=24;}return *this;//返回的对象为改之前的，但实际对象已经改变}CTime CTime::operator++( ){    if(++second>=60)    {        second-=60;        ++minute;    }    if(minute>=60)    {        minute-=60;        ++hour;    }    if(hour>=24)    {        hour-=24;    }    return *this;}CTime CTime::operator--( int){second--;while(second<=0){second+=60;--minute;}while(minute<=0){minute+=60;--hour;}while(hour<0){hour+=24;}return *this;//返回的对象为改之前的，但实际对象已经改变}CTime CTime::operator--( ){    if(--second<=0)    {        second+=60;        --minute;    }    if(minute<=0)    {        minute+=60;        --hour;    }    if(hour<=0)    {        hour+=23;    }    return *this;}CTime CTime::operator+=(CTime &c){int time;time = hour*3600+minute*60+second+(c.hour*3600+c.minute*60+c.second);hour=time/3600;time =time%3600;minute =time/60;time = time%60;second =time;return *this;}CTime CTime::operator-=(CTime &c){int time;time = hour*3600+minute*60+second-(c.hour*3600+c.minute*60+c.second);if(time<0){time=-time;}hour=time/3600;while(hour>=24){hour-=24;}time =time%3600;minute =time/60;time = time%60;second =time;return *this;}CTime CTime::operator+=(int s){second+=s;while(second>=60){second-=60;++minute;}while(minute>=60){minute-=60;++hour;}while(hour>=24){hour-=24;}return *this;}CTime CTime::operator-=(int s){    int time;    time=hour*3600+minute*60+second-s;    if(time<0)    {        time=(-time);    }    hour=time/3600;    if(hour>=24)    {        hour-=24;    }time =time%3600;minute =time/60;time = time%60;second =time;return *this;}int 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 = t1-t2;cout<<"t1-t2 =";t.display();t = t1+15;cout<<"t1+15s =";t.display();t = t1-15;cout<<"t1-15s =";t.display();t = t1++;cout<<"t1++ =";t.display();t = ++t1;cout<<"++t1 =";t.display();t = t1--;cout<<"t1-- =";t.display();t = --t1;cout<<"--t1 =";t.display();t1+=t2;cout<<"t1+=t2  =";t1.display();t1-=t2;cout<<"t1-=t2  =";t1.display();t1 +=24;cout<<"t1+=24s =";t1.display();t1 -=55;cout<<"t1-=55s =";t1.display();}

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