第八周 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();
//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: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
};
//下面实现所有的运算符重载代码。
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;
if(second<t.second) return false;
return false;
}
bool CTime :: operator < (CTime &t)
{
if(hour>t.hour) return false;
if(hour<t.hour) return true;
if(minute>t.minute) return false;
if(minute<t.minute) return true;
if(second>t.second) 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;
if(second<=t.second) return false;
return false;
}
bool CTime :: operator <= (CTime &t)
{
if(hour>=t.hour) return false;
if(hour<=t.hour) return true;
if(minute>=t.minute) return false;
if(minute<=t.minute) return true;
if(second>=t.second) 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;
if(second!=t.second) return false;
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;
if(second==t.second) return false;
return false;
}
CTime CTime :: operator+(CTime &t)
{
int h,m,s;
s=t.second+second;
m=t.minute+minute;
h=t.hour+hour;
if(s>59)
{
m=m+1;
s=s-60;
}
if(m>59)
{
h=h+1;
m=m-60;
}
if(h>23)
{
h=h-24;
}
CTime c(h,m,s);
return c;
}
CTime CTime :: operator-(CTime &t)
{
int h,m,s;
s=t.second-second;
m=t.minute-minute;
h=t.hour-hour;
if(s<0)
{
m=m-1;
s=s+60;
}
if(m<0)
{
h=h-1;
m=m+60;
}
if(h<0)
{
h=h+24;
}
CTime c(h,m,s);
return c;
}
CTime CTime :: operator+(int s)
{
int h,m,e;
e=second+s+hour*60*60+minute*60;
h=(e/60)/60;
m=(e/60)%60;
e=e%60;
CTime c(h,m,e);
return c;

}
CTime CTime :: operator-(int s)
{
int h,m,e;
e=second+hour*60*60+minute*60;
e=e-s;
h=(e/60)/60;
m=(e/60)%60;
e=e%60;
CTime c(h,m,e);
return c;
}
CTime CTime :: operator+=(CTime &t)
{
int h,m,s;
s=t.second+second;
m=t.minute+minute;
h=t.hour+hour;
if(s>59)
{
m=m+1;
s=s-60;
}
if(m>59)
{
h=h+1;
m=m-60;
}
if(h>23)
{
h=h-24;
}
CTime c(h,m,s);
return c;
}
CTime CTime :: operator-=(CTime &t)
{

int h,m,s;
s=t.second-second;
m=t.minute-minute;
h=t.hour-hour;
if(s<0)
{
m=m-1;
s=s+60;
}
if(m<0)
{
h=h-1;
m=m+60;
}
if(h<0)
{
h=h+24;
}
CTime c(h,m,s);
return c;

}
CTime CTime :: operator+=(int s)
{
int h,m,e;
e=second+s+hour*60*60+minute*60;
h=(e/60)/60;
m=(e/60)%60;
e=e%60;
CTime c(h,m,e);
return c;
}
CTime CTime :: operator-=(int s)
{

int h,m,e;
e=second+hour*60*60+minute*60;
e=e-s;
h=(e/60)/60;
m=(e/60)%60;
e=e%60;
CTime c(h,m,e);
return c;
}
//自行编制用于测试的main()函数，有些结果不必依赖display()函数，提倡用单步执行查看结果
int main()
{
CTime t1(12,20,25),t2(11,20,50),t3,t4,t5;
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=="<<endl;
if (t1!=t2) cout<<"t1!=t2"<<endl;
if (t1>=t2) cout<<"t1>=t2"<<endl;
if (t1<=t2) cout<<"t1<=t2"<<endl;
cout<<endl;
t3=t1+t2;
cout<<"t1+t2=";
t3.display();
cout<<endl;
cout<<"t1-t2=";
t4=t1-t2;
t4.display();
cout<<endl;
cout<<"t1+200=";
t5=t1+200;
t5.display();
cout<<endl;
cout<<"t1+t2=";
t1+=t2;
return 0;
}