第九周任务二：CTime类的扩展

#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);
//比较运算符(二目)的重载
bool operator > (CTime &t);
bool operator < (CTime &t);
bool operator >= (CTime &t);
bool operator <= (CTime &t);
bool operator == (CTime &t);
bool operator != (CTime &t);
//二目运算符的重载
CTime operator+(CTime &c);//返回c所规定的时、分、秒后的时间，例t1(8,20,25),t2(11,20,50)，t1+t2为:41:15
CTime operator-(CTime &c);//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
//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
//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
//运算符<<和>>的重载为友元函数
friend istream &operator >> (istream&,CTime&);
friend ostream &operator << (ostream&,CTime&);
};
//下面实现所有的运算符重载代码。
//为简化编程，请注意通过调用已有函数，利用好各函数之间的关系
void CTime::setTime(int h,int m,int s)
{
hour=h;
minute=m;
second=s;

}

//比较运算符(二目)的重载
bool CTime::operator > (CTime &t)
{
if(hour>t.hour)
{
return true;
}
else
{
if(hour==t.hour)
{
if(minute>t.minute)
{
return true;
}
else
{
if(minute==t.minute)
{
if(second>t.second)
{return true;}
else
{return false;}
}
else
{
return false;
}

}
}

}
}
bool CTime::operator < (CTime &t)
{
if(hour<t.hour)
{
return true;
}
else
{
if(hour==t.hour)
{
if(minute<t.minute)
{
return true;
}
else
{
if(minute==t.minute)
{
if(second<t.second)
{return true;}
else
{return false;}
}
else
{
return false;
}

}
}

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

//二目运算符的重载
CTime  CTime::operator+(CTime &c)//返回c所规定的时、分、秒后的时间，例t1(8,20,25),t2(11,20,50)，t1+t2为:41:15
{
CTime  c1;
c1.second=second+c.second;
c1.minute=minute+c.minute;
c1.hour=hour+c.hour;
if(c1.second>60)
{
c1.minute=c1.minute+c1.second/60;
c1.second=c1.second%60;
}
if(c1.minute>60)
{
c1.hour=c1.hour+c1.minute/60;
c1.minute=c1.minute%60;
}
if(c1.hour>24)
{
c1.hour=c1.hour%24;
}

return c1;

}

CTime  CTime::operator-(CTime &c)//对照+理解
{
CTime  c1;
if(second>c.second)
{
c1.second=second-c.second;
}
else
{
c1.second=second+60-c.second;
minute=minute-1;
}

if(minute>=c.minute)
{
c1.minute=minute-c.minute;
}
else
{
c1.minute=minute+60-c.minute;
hour=hour-1;
}

c1.hour=hour-c.hour;

return c1;
}
CTime  CTime::operator+(int s)//返回s秒后的时间
{
CTime  c1;
c1.second=second+s;
if(c1.second>=60)
{
c1.minute=minute+c1.second/60;
c1.second=c1.second%60;
}
else
{
c1.minute=minute;
c1.hour=hour;
}
if(c1.minute>=60)
{
c1.hour=hour+c1.minute/60;
c1.minute=c1.minute%60;
}
else
{
c1.minute=minute+c1.second/60;
c1.hour=hour;

}
if(c1.hour>24)
{
c1.hour=hour%24;
}
else
{
c1.hour=hour;
}

return c1;
}
CTime  CTime::operator-(int s)//返回s秒前的时间
{
CTime  c1;
if(second>=s)
{
c1.second=second-s;
c1.minute=minute;
c1.hour=hour;
}
else
{
c1.second=second+60-s;
c1.minute=minute-1;
if(c1.minute<0)
{
c1.minute=59;
c1.hour=hour-1;
}
else
{
c1.hour=hour;
}

return c1;

}

}

//一目运算符的重载
CTime CTime::operator++(int)//后置++，下一秒
{
CTime temp(*this);

*this=*this+1;
return temp;
}
CTime CTime::operator++()//前置++，下一秒
{
*this=*this+1;
return (*this);
}
CTime CTime::operator--(int)//后置--，前一秒
{
CTime temp(*this);
*this=*this-1;
return temp;
}
CTime CTime::operator--()//前置--，前一秒
{
*this=*this-1;
return (*this);
}

//赋值运算符的重载
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)//返回s秒后的时间
{
return(*this+s);
}
CTime CTime::operator-=(int s)//返回s秒前的时间
{
return(*this-s);
}
//定义运算符>>重载函数
istream &operator >> (istream& input,CTime& c)
{
cout<<"请输入时间";
input>>c.hour>>c.minute>>c.second;
return input;
}
//定义运算符<<重载函数
ostream &operator << (ostream& output,CTime& c)
{
output<<"("<<c.hour<<":"<<c.minute<<":"<<c.second<<")";
return output;

}
void main()
{
CTime t1,t2,t;
int s=30;

cin>>t1>>t2;

cout<<"t1为："<<t1<<endl;

cout<<"t2为："<<t2<<endl;

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＝t2"<<endl;
if (t1!=t2) cout<<"t1≠t2"<<endl;
if (t1>=t2) cout<<"t1≥t2"<<endl;
if (t1<=t2) cout<<"t1≤t2"<<endl;
cout<<endl;

//下面自行设计对其他运算符的重载的测试
t=t1+t2;
cout<<"t1+t2为："<<t<<endl;

t=t2-t1;
cout<<"t2-t1为："<<t<<endl;

t=t1+s;
cout<<"t1+s为："<<t<<endl;

t=t1-s;
cout<<"t1-s为："<<t<<endl;

t=t1++;
cout<<"t1++为："<<t<<endl;

t=++t1;
cout<<"++t1为："<<t<<endl;

t=t1--;
cout<<"t1--为："<<t<<endl;

t=--t1;
cout<<"--t1为："<<t<<endl;

t1+=t2;
cout<<"t1+=t2为："<<t<<endl;

t1-=t2;
cout<<"t1-=t2为："<<t<<endl;

t=t1-=s;
cout<<"t1-=s为："<<t<<endl;

t=t1+=s;
cout<<"t1+=s为："<<t<<endl;

system("pause");

}