第九周项目二Time类中的运算符重载（续）（1）

/*
* Copyright (c) 2014, 烟台大学计算机与控制工程学院
* All rights reserved.
* 文件名称：test.cpp
* 作    者：郝俊宇
* 完成日期：2015年 5 月9 日
* 版 本 号：v1.0
* 问题描述：在第八周项目二的基础上（1）定义对时间对象的自增和自减一目运算符
* 输入描述：无
* 程序输出：对应的结果
*/
#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，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
};
CTime::CTime(int h,int m,int s)//赋值
{
hour=h;
minute=m;
second=s;
}
void CTime::setTime(int h,int m,int s)//设置时间
{
hour=h;
minute=m;
second=s;
}
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;
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;
return false;
}
bool CTime::operator>=(CTime &t)//判断t1>=t2
{
if(*this<t)
return false;
return true;
}
bool CTime::operator<=(CTime &t)//判断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)||(*this<t))
return true;
return false;
}
CTime CTime::operator+(CTime &t)//计算t1+t2
{
CTime c;
c.hour=hour+t.hour;
c.minute=minute+t.minute;
c.second=second+t.second;
if(c.second>=60)
{
c.minute++;
c.second=c.second-60;
}
if(c.minute>=60)
{
c.hour++;
c.minute=c.minute-60;
}
if(c.hour>=24)
{
c.hour=c.hour-24;
}
return c;
}
CTime CTime::operator-(CTime &t)//计算t1-t2
{
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 c(h,m,s);
return c;

}
CTime CTime::operator+(int s)//增加s秒
{
CTime c;
c.hour=hour;
c.minute=minute;
c.second=second+s;
if(c.second>=60)
{
c.minute=c.minute+c.second/60;
c.second=c.second%60;
}
if(c.minute>=60)
{
c.hour=c.hour+c.minute/60;
c.minute=c.minute%60;
}
if(c.hour>=24)
{
c.hour=c.hour-24;
}
return c;
}
CTime CTime::operator-(int s)//减去s秒
{
int ss,mm,hh;
ss=s%60;
mm=(s/60)%60;
hh=s/3600;
CTime c(hh,mm,ss);
return *this-c;

}
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;
}
CTime CTime::operator++(int)
{
CTime t=*this;
*this=*this+1;
return t;
}
CTime CTime::operator++()
{
*this=*this+1;
return *this;
}
CTime CTime::operator--(int)
{
CTime t=*this;
*this=*this-1;
return t;
}
CTime CTime::operator--()
{
*this=*this-1;
return *this;
}
void CTime::display()
{
cout<<hour<<":"<<minute<<":"<<second<<endl;
}
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;
cout<<"t1++=";
t=t1++;
t.display();
cout<<"t2--=";
t=t2--;
t.display();
cout<<"++t1=";
t=++t1;
t.display();
cout<<"--t2=";
t=--t2;
t.display();
cout<<"t1+t2=";
t=t1+t2;
t.display();
cout<<"t1-t2=";
t=t1-t2;
t.display();
cout<<"t1+2000=";
t=t1+2000;
t.display();
cout<<"t1-5000=";
t=t1-5000;
t.display();
cout<<"t1+=t2,t1=";
t1+=t2;
t1.display();
cout<<"t1-=t2,t1=";
t1-=t2;
t1.display();
cout<<"t1+=2000,t1=";
t1+=2000;
t1.display();
cout<<"t1-=5000,t1=";
t1-=5000;
t1.display();
return 0;
}