第八周任务二

#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);  
    void display();  
    //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  
};  
//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;
}  
  
void CTime::display()  
{  
    cout<<hour<<":"<<minute<<":"<<second<<endl;  
}  
  
bool CTime::operator > (CTime &t)  
{  
    if(hour>t.hour)  
        return true;  
    else if(minute>t.minute)  
            return true;  
        else if(second>t.second)  
                return true;  
           else  
                return false;  
}  
  
bool CTime::operator < (CTime &t)  
{  
    if(hour<t.hour)  
        return true;  
    else if(minute<t.minute)  
            return true;  
        else if(second<t.second)  
                return true;  
           else  
                return false;  
}  
  
bool CTime::operator >= (CTime &t)  
{  
    if(operator <(t)!=1)  
        return true;  
    else   
        return false;  
}  
  
bool CTime::operator <= (CTime &t)  
{  
    if(operator >(t)!=1)  
        return true;  
    else   
        return false;  
}  
  
bool CTime::operator == (CTime &t)  
{  
    if(operator <(t)!=1||operator >(t)!=1)  
        return true;  
    else  
        return false;  
}  
  
bool CTime::operator != (CTime &t)  
{  
    if(operator <(t)==1||operator >(t)==1)  
        return true;  
    else  
        return false;  
}  
  
CTime CTime::operator+(CTime &c)  
{  
    CTime c1; 
    c1.second=second+c.second;  
    c1.minute=minute+c.minute;  
    c1.hour=hour+c.hour;  
    if(c1.second>59)  
    {  
        c1.second=c1.second-60;  
        c1.minute=c1.minute+1;  
    }  
    if(c1.minute>59)  
    {  
        c1.minute=c1.minute-60;  
        c1.hour=c1.hour+1;  
    }  
    return c1;  
}  
  
CTime CTime::operator-(CTime &c)  
{  
    CTime c1; 
	if(operator <(c)==1)
		cout<<"输入错误"<<endl;
	else
    c1.second=second-c.second;  
    c1.minute=minute-c.minute;  
    c1.hour=hour-c.hour;  
    if(c1.second>59)  
    {  
        c1.second=c1.second-60;  
        c1.minute=c1.minute+1;  
    }  
    if(c1.minute>59)  
    {  
        c1.minute=c1.minute-60;  
        c1.hour=c1.hour+1;  
    }  
    return c1;  
}  
  
CTime CTime::operator+(int s)  
{  
    CTime c1;  
    c1.second=second+s;  
    if(c1.second>59)  
    {  
        c1.second-=60;  
        ++minute;  
    }  
    if(minute>59)  
    {  
        minute-=60;  
        ++hour;  
    }  
    return c1;  
}  
  
CTime CTime::operator-(int s)  
{  
    CTime c1;   
    if(c1.second<59)  
    {  
        c1.second+=60;  
        --minute;  
    }  
    if(minute<0)  
    {  
        minute+=60;  
        --hour;  
    }
	c1.second=second-s;
    return c1;  
}  
  
CTime CTime::operator++(int)  
{  
    CTime temp(*this);  
    second++;  
    if(second>59)  
    {  
        second-=60;  
        ++minute;  
    }  
    return temp;  
}  
  
CTime CTime::operator++()     
{  
    if(++second>59)  
    {  
        second-=60;  
        ++minute;  
    }  
    return *this;  
}  
  
CTime CTime::operator--(int)  
{  
    CTime temp(*this);  
    second--;  
    return temp;  
}  
  
CTime CTime::operator--()     
{  
    --second;  
    return *this;  
}  
  
CTime CTime::operator+=(CTime &c)  
{  
    CTime c1;  
    c1=*this+c;
    return c1;  
}  
  
CTime CTime::operator-=(CTime &c)  
{  
    CTime c1;  
    c1=*this-1;
    return c1;  
}  
  
CTime CTime::operator+=(int s)  
{  
    CTime c1;  
    c1=*this+s;
    return c1;  
}  
  
CTime CTime::operator-=(int s)  
{  
    CTime c1;  
    c1=*this-s;
    return c1;  
}    
void main()    
{    
    CTime t1(8,20,25), t2(11,20,50), t;    
    
    cout << "t1为：";    
    
    t1.display();    
    
    cout << "t2为：";    
    
    t2.display();    
    
    cout << "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;    
    
    cout<<endl;   
    
    t = t1 + t2;    
    
    cout << "t1 + t2 = ";    
    
    t.display();  
 
  
    t = t1-t2;    
    
    cout << "t1-t2 = ";    
    
    t.display();  
  
    t = t1;  
  
    t = t + 35;  
  
    cout<< "t1 + 35 = ";  
      
    t .display();  
  
    t = t2;  
  
    t = t - 8;  
  
    cout<< "t2 - 8 = " ;  
  
    t.display();  
  
    t = t1;  
  
    t = t ++;  
  
    cout << endl;  
  
    cout << "t1++ = ";  
  
    t.display();  
  
    t = t1;  
  
    t = ++t;  
  
    cout << "++t1 = ";  
  
    t.display();  
  
    t = t2;  
  
    t = t --;  
  
    cout << "t2-- = ";  
  
    t.display();  
  
    t = t2;  
  
    t = --t;  
  
    cout << "--t1 = ";  
  
    t.display();  
  
    t = t1;  
  
    t +=t2;  
  
    cout << "t1 += t2,t1 = " ;  
  
    t.display();  
  
    t = t2;  
  
    t -= t1;  
  
    cout << "t2 -= t1,t2 = " ;  
  
    t.display();  
  
    t = t1;  
  
    t += 5;  
  
    cout << "t1 += 5 = " ;  
  
    t.display();  
  
    t = t1;  
  
    t -= 6;  
   
    cout << "t1 -= 6 = " ;  
  
    t.display();  
  
    system("pause");    
}