项目2-Time类中的运算符重载

/*
*Copyright (c) 2013 ,烟台大学计算机学院
*All rights reserved.
*作者：张凤宁
*完成日期：2014年5月4
*版本号：v1.0
*问题描述：
*样例输入：
*样例输出：
*问题分析：用简单的方法，学会活学活用
*/
#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();
//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: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
};
//下面实现所有的运算符重载代码。
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) //判断t1>t2
{
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;
if(second<t.second)  return false;
}
bool CTime::operator<(CTime &t) //判断t1<t2
{
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;
if(second>t.second)  return false;
}
bool CTime::operator >= (CTime &t) // 判断时间t1>=t2
{
if (*this<t) return false;
return true;
}
bool CTime::operator <= (CTime &t) // 判断时间t1<=t2
{
if (*this > t) return false;
return true;
}
bool CTime::operator == (CTime &t) //判断t1==t2
{
if (*this>t||*this<t) return false;
return true;
}
bool CTime::operator != (CTime &t) //判断t1!=t2
{
if (*this==t) return false;
return true;
}
CTime CTime::operator + (CTime &t)
{

int h,m,s;
s=second+t.second;
m=minute+t.minute;
h=hour+t.hour;
if (s>59)
{
s-=60;
m++;
}
if (m>59)
{
m-=60;
h++;
}
if (h>23) h-=24;
CTime t0(h,m,s);
return t0;
}
//返回s秒后的时间
CTime CTime::operator+(int s)
{
int ss=s%60;
int mm=(s/60)%60;
int hh=s/3600;
CTime t0(hh,mm,ss);
return *this+t0;
}

// 计算时间之差
CTime CTime::operator - (CTime &t)
{
int h,m,s;
s=second-t.second;
m=minute-t.minute;
h=hour-t.hour;
if (s<0)
{
s+=60;
m--;
}
if (m<0)
{
m+=60;
h--;
}
if (h<0) h+=24;
CTime t0(h,m,s);
return t0;
}

//返回s秒前的时间
CTime CTime::operator-(int s)
{
int ss=s%60;
int mm=(s/60)%60;
int hh=s/3600;
CTime t0(hh,mm,ss);
return *this-t0;
}
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)
{
*this=*this+s;
return *this;
}
CTime CTime::operator-=(int s)
{
*this=*this-s;
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;
t=t1-t2;
t=t1+2000;
t=t1-5000;
t1+=t2;
t1-=t2;
t1+=2000;
t1-=5000;
return 0;
}