第八周项目2-Time类中的运算符重载

#include <iostream>

using namespace std;

class CTime
{
private:
short int hour;
short int minute;
short int second;
public:
CTime(int h=0,int m=0,int s=0);
void setTime(int h,int m,int s);
void display();
bool operator>(CTime &t);
bool operator<(CTime &t);
bool operator>=(CTime &t);
bool operator<=(CTime &t);
bool operator==(CTime &t);
bool operator!=(CTime &t);
CTime operator+(CTime &t);
CTime operator-(CTime &t);
CTime operator+(int s);
CTime operator-(int s);
CTime operator+=(CTime &c);
CTime operator-=(CTime &c);
CTime operator+=(int s);
CTime operator-=(int s);
};

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;
else 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;
else return false;
}

bool CTime::operator>=(CTime &t)
{
if(*this<t) return false;
return true;
}

bool CTime::operator<=(CTime &t)
{
if(*this>t) return false;
return true;
}

bool CTime::operator==(CTime &t)
{
if(*this<t||*this>t) return false;
return true;
}

bool CTime::operator!=(CTime &t)
{
if(*this<t||*this>t) return true;
return false;
}

CTime CTime::operator+(CTime &t)
{
CTime c;
c.hour=hour+t.hour;
c.minute=minute+t.minute;
c.second=second+t.second;
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-(CTime &t)
{
CTime c;
c.hour=hour-t.hour;
c.minute=minute-t.minute;
c.second=second-t.second;
if(c.second<0)
{
c.second+=60;
c.minute--;
}
if(c.minute<0)
{
c.minute+=60;
c.hour--;
}
if(c.hour<0)
{
c.hour+=24;
}
return c;
}

CTime CTime::operator+(int s)
{
second+=s;
if(second>60)
{
minute=minute+second/60;
second=second%60;
}
if(minute>60)
{
hour=hour+minute/60;
minute=minute%60;
}
if(hour>24)
{
hour=hour%24;
}
return *this;
}

CTime CTime::operator-(int s)
{
second-=s;
if(second<0)
{
second+=60;
minute--;
}
if(minute<0)
{
minute+=60;
hour--;
}
if(hour<0)
{
hour+=24;
}
return *this;
}

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+=s;
return *this;
}

CTime CTime::operator-=(int s)
{
*this-=s;
return *this;
}
int main()
{
CTime t1(8,20,25),t2;
int h,m,s;
cout<<"输入时间大小：";
cin>>h>>m>>s;
t2.setTime(h,m,s);
cout<<"两个时间分别为："<<endl;
t1.display();
t2.display();
cout<<"下面比较两个时间大小："<<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;
if(t1!=t2) cout<<"t1!=t2"<<endl;
CTime t;
cout<<"下面是时间的加减运算符的重载："<<endl;
t=t1+t2;
cout<<"t1+t2=";
t.display();
t=t1-t2;
cout<<"t1-t2=";
t.display();
t1+=t2;
cout<<"t1+=t2 ";
t1.display();
t1-=t2;
cout<<"t1-=t2 ";
t1.display();
t1=t1+55;
cout<<"t155秒后时间为：";
t1.display();
t2=t1-55;
cout<<"t255秒前的时间为：";
t2.display();

return 0;
}