Time类的运算符重载

/*
* 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：王飞
* 完成日期：2013 年4月 21日
* 版本号： v1.0
* 输入描述：无
* 问题描述：Time类的运算符重载
* 程序输出：如下
*/

#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 t);     //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>t.hour) {return true;}
else if(minute>t.minute){return true;}
else if(second>t.second){return true;}
else {return false;}

}

bool CTime::operator < (CTime &t)
{
if(hour<t.hour) {return true;}
else if(minute<t.minute){return true;}
else if(second<t.second){return true;}
else {return false;}

}

bool CTime::operator >= (CTime &t)
{
if(hour>=t.hour) {return true;}
else if(minute>=t.minute){return true;}
else if(second>=t.second){return true;}
else {return false;}

}

bool CTime::operator <= (CTime &t)
{
if(hour<=t.hour) {return true;}
else if(minute<=t.minute){return true;}
else if(second<=t.second){return true;}
else {return false;}

}

bool CTime::operator == (CTime &t)
{
if(hour==t.hour) {return true;}
else if(minute==t.minute){return true;}
else if(second==t.second){return true;}
else {return false;}

}
bool CTime::operator != (CTime &t)
{
if(hour!=t.hour) {return true;}
else if(minute!=t.minute){return true;}
else if(second!=t.second){return true;}
else {return false;}

}
CTime CTime::operator+(CTime &c)
{
CTime b;
b.hour=hour+c.hour;
b.minute=minute+c.minute;
b.second=second+c.second;
if(b.second>=60)
{
b.minute+=b.second/60;
b.second%=60;
if(b.minute>59)
{
b.hour+=b.minute/60;
b.minute%=60;
}
if(b.hour>23)
{
b.hour%=24;
}
}
return b;
}
CTime CTime::operator-(CTime &c)
{
CTime b;
b.hour=hour-c.hour;
b.minute=minute-c.minute;
b.second=second-c.second;
if(b.second<0)
{
b.minute+=b.second/60;
b.second%=60;
if(b.minute<0)
{
b.hour+=b.minute/60;
b.minute%=60;
}
if(b.hour<0)
{
b.hour%=24;
}
}
return b;
}
CTime CTime::operator+(int s)      //增加秒数
{
CTime b;
b.hour=hour;
b.minute=minute;
b.second=second+s;
if(b.second>=60)
{
b.minute+=b.second/60;
b.second%=60;
if(b.minute>59)
{
b.hour+=b.minute/60;
b.minute%=60;
}
if(b.hour>23)
{
b.hour%=24;
}
}
return b;
}

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;
}

//一目运算符的重载
CTime CTime::operator++(int)//后置++，下一秒
{
CTime t=*this;
*this=*this+1;
return t;
}

CTime CTime::operator++()//前置++，下一秒
{
*this=*this+1;
return *this;
}

CTime CTime::operator--(int)//后置--，前一秒
{
CTime t=*this;
*this=*this-1;
return t;
}

CTime CTime::operator--()//前置--，前一秒
{
*this=*this-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)//返回s秒后的时间
{
*this=*this+s;
return *this;
}
CTime CTime::operator-=(int s)//返回s秒前的时间
{
*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;
t1.display();
t2.display();
cout<<"两个时间相加为："<<endl;
t=t1+t2;
t.display();
t=t1++;
cout<<"t1++=";
t.display();
t=++t1;
cout<<"++t1=";
t.display();
t1--;
cout<<"t1--=";
t1.display();
--t1;
cout<<"--t1=";
t1.display();
cout<<"t1-=t2=";
t1.display();
return 0;
}