第12周项目2-Time类中的运算符重载

#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):hour(h),minute(m),second(s){}
void setTime(int h,int m,int s){ hour=h;minute=m;second=s;}
void display(){cout<<hour<<":"<<minute<<":"<<second<<endl;}
//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
CTime operator--( int);//后置--，前一秒
CTime &operator--();//前置--，前一秒
};
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(*this>t)  return false;
else return true;
}
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(*this<t)  return false;
else return true;
}
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(*this==t) return false;
else return true;
}

CTime CTime::operator+(CTime &t)
{
return CTime(hour+t.hour,minute+t.minute,second+t.second);

}
CTime CTime::operator-(CTime &t)
{
return CTime(hour-t.hour,minute-t.minute,second-t.second);

}
CTime CTime::operator+(int s)
{
return CTime(hour,minute,second+s);
}
CTime CTime::operator-(int s)
{
return CTime(hour,minute,second-s);
}
CTime & CTime::operator+=(CTime &c)
{
this->hour+=c.hour;
this->minute+=c.minute;
this->second+=c.second;
return *this;
}
CTime & CTime::operator-=(CTime &c)
{
this->hour-=c.hour;
this->minute-=c.minute;
this->second-=c.second;
return *this;
}
CTime & CTime::operator+=(int s)
{
this->second+=s;
return *this;
}
CTime & CTime::operator-=(int s)
{
this->second-=s;
return *this;
}
CTime CTime::operator++(int)
{
this->second++;
return *this;
}
CTime CTime::operator--(int)
{
this->second--;
return *this;
}
CTime & CTime::operator++()
{
++this->second;
return *this;
}
CTime & CTime::operator--()
{
--this->second;
return *this;
}
int main()
{
CTime a(11,11,11);
a.display();
CTime b(1,1,1);
CTime c;
c=a+b;
c.display();
a--;
a.display();
b++;
b.display();
while(1)
{
if(a>b)
{cout<<"a>b"<<endl; break;}
else
{cout<<"a<=b"<<endl;break;}
}
--a;
a.display();
++b;
b.display();

return 0;
}