2-8-2 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
unsigned short int SEC;

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
};
CTime::CTime(int h,int m,int s)
{
hour=h;
minute=m;
second=s;
SEC=hour*3600+minute*60+second;
}
void CTime::setTime(int h,int m,int s)
{
hour=h;
minute=m;
second=s;
SEC=hour*3600+minute*60+second;
}
void CTime::display()
{
cout<<hour<<':'<<minute<<':'<<second<<endl;
}
bool CTime::operator>(CTime &t)
{
return SEC>t.SEC;
}
bool CTime::operator<(CTime &t)
{
return SEC<t.SEC;
}
bool CTime::operator<=(CTime &t)
{
return !(SEC>t.SEC);
}
bool CTime::operator>=(CTime &t)
{
return !(SEC<t.SEC);
}
bool CTime::operator==(CTime &t)
{
return SEC==t.SEC;
}
bool CTime::operator!=(CTime &t)
{
return !(SEC==t.SEC);
}
CTime CTime::operator+(CTime &t)
{
int h,m,s;
s=second+t.second;
m=minute+t.minute;
h=hour+t.hour;
if(s>=60)
{
++m;
s-=60;
}
if(m>=60)
{
++h;
m-=60;
}
if(h>=24)
h-=24;
return CTime(h,m,s);
}
CTime CTime::operator-(CTime &t)
{
int h,m,s;
s=second-t.second;
m=minute-t.minute;
h=hour-t.hour;
if(s<0)
{
m--;
s+=60;
}
if(m<0)
{
h--;
m+=60;
}
if(h<0)
h+=24;
return CTime(h,m,s);
}
CTime CTime::operator+(int s)
{
if((second+=s)>=60)
{
minute+=second/60;
second%=60;
}
if(minute>=60)
{
hour+=minute/60;
minute%=60;
}
if(hour>=24)
hour%=24;
return *this;
}
CTime CTime::operator-(int s)
{
int hh,mm,ss;
ss=s%60;
mm=(s/60)%60;
hh=(s/3600)%24;
CTime t(hh,mm,ss);
return *this-t;
}
CTime CTime::operator+=(CTime &t)
{
*this=*this+t;
return *this;
}
CTime CTime::operator-=(CTime &t)
{
*this=*this-t;
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(12,0,0),t2; //测试构造函数
t2.setTime(11,59,59); //测试settime()
t1.display(); //测试display()
t2.display();
cout<<(t1>t2?"t1>t2":"t1<t2")<<endl;  //测试operator>()
CTime t3(22,1,10),t4(23,50,10);
t3.display();
t4.display();
cout<<(t3>=t4?"t3>=t4":"t3<t4")<<endl; //测试operator>=()
cout<<(t2<=t1?"t2<=t1":"t2>t1")<<endl; //测试operator<=()
cout<<(t3==t4?"t3==t4":"t3!=t4")<<endl; //测试operator==()
cout<<(t1!=t2?"t1!=t2":"t1==t2")<<endl; //测试operator!=()
(t1+t2).display(); //测试operator+()
(t3+t4).display();
(t1-t2).display();//测试operator-()
(t3-t4).display();
(t4+600).display();
(t1-20).display();
(t1+=t2).display();
(t1-=t2).display();
(t1+=600).display();
(t1-=300).display();
return 0;
}