第9周项目2-Time类中的运算符重载（续）

#include <iostream>
using namespace std;
class CTime
{
private:
short int hour;    // 时
short int minute;  // 分
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
void 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 operator++(int);
CTime operator++();
CTime operator--(int);
CTime operator--();
friend istream& operator>>(istream& input,CTime& t);
friend ostream& operator<<(ostream& output,CTime& t);
};
istream& operator>>(istream& input,CTime& t)
{
char a;
cin>>t.hour>>a>>t.minute>>a>>t.second;
return input;
}
ostream& operator<<(ostream& output,CTime& t)
{
cout<<t.hour<<":"<<t.minute<<":"<<t.second;
return output;
}
CTime CTime::operator++(int)
{
CTime t(*this);
*this+=1;
return t;
}
CTime CTime::operator++()
{
*this+=1;
return *this;
}
CTime CTime::operator--(int)
{
CTime t(*this);
*this-=1;
return t;
}
CTime CTime::operator--()
{
return *this-1;
}
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;
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)
{
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)
{
if((*this)>t||(*this)<t) return false;
else return true;
}
bool CTime::operator>=(CTime &t)
{
return !((*this)<t);
}
bool CTime::operator<=(CTime &t)
{
return !((*this)>t);
}
bool CTime::operator!=(CTime &t)
{
return !((*this)==t);
}
CTime CTime::operator+(CTime &t)
{
CTime t0;
t0.hour=hour+t.hour;
t0.minute=minute+t.minute;
t0.second=second+t.second;
if(t0.second>=60)
{
t0.second-=60;
t0.minute++;
}
if(t0.minute>=60)
{
t0.minute-=60;
t0.hour++;
}
if(t0.hour>=24)
t0.hour-=24;
return t0;
}
CTime CTime::operator-(CTime &t)
{
CTime t0;
t0.hour=hour-t.hour;
t0.minute=minute-t.minute;
t0.second=second-t.second;
if(t0.second<0)
{
t0.second+=60;
t0.minute--;
}
if(t0.minute<0)
{
t0.minute+=60;
t0.hour--;
}
if(t0.hour<0)
t0.hour+=24;
return t0;
}
CTime CTime::operator+(int ss)
{
int h,m,s;
h=ss/3600;
ss=ss%3600;
m=ss/60;
s=ss%60;
return CTime(h,m,s)+(*this);
}
CTime CTime::operator-(int ss)
{
int h,m,s;
h=ss/3600;
ss=ss%3600;
m=ss/60;
s=ss%60;
CTime t0(h,m,s);
return (*this)-t0;
}
void CTime::operator+=(CTime &t)
{
(*this)=(*this)+t;
}
CTime CTime::operator-=(CTime &t)
{
(*this)=(*this)-t;
return *this;
}
CTime CTime::operator+=(int ss)
{
(*this)=(*this)+ss;
return (*this);
}
CTime CTime::operator-=(int ss)
{
(*this)=(*this)-ss;
return (*this);
}
int main()
{
CTime t1,t2,t;
cin>>t1>>t2;
cout<<"t1="<<t1<<'\t'<<"t2="<<t2<<endl;
t=t1++;
cout<<t<<'\t'<<t1<<endl;
t=++t1;
cout<<t<<'\t'<<t1;
return 0;
}