8.2 Time 的運算符重載

* 程序的版權和版本聲明部分
* Copyright (c) 2011, 煙臺大學計算機學院學生
* All rights reserved.
* 文件名稱：      第八週 任務二                       
* 作    者：          楊森                   
* 完成日期：      2012   年    4   月    10    日
* 版 本 號：      V1.0

源程序：

#include <iostream>   
using namespace std;  
class CTime  
{  
private:  
    unsigned short int hour;    // 時   
    unsigned short int minute;  // 分   
    unsigned 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();  
    //比較運算符(二目)的重載   
    bool operator > (CTime &t);  
    bool operator < (CTime &t);  
    bool operator >= (CTime &t);  
    bool operator <= (CTime &t);  
    bool operator == (CTime &t);  
    bool operator != (CTime &t);  
    //二目運算符的重載   
    CTime operator+(CTime &c);//返回c所規定的時、分、秒後的時間，例t1(8,20,25),t2(11,20,50)，t1+t2爲:41:15   
    CTime operator-(CTime &c);//對照+理解   
    CTime operator+(int s);//返回s秒後的時間   
    CTime operator-(int s);//返回s秒前的時間   
    //一目運算符的重載   
    CTime operator++(int);//後置++，下一秒   
    CTime operator++();//前置++，下一秒   
    CTime operator--(int);//後置--，前一秒   
    CTime operator--();//前置--，前一秒   
    //賦值運算符的重載        
    CTime operator+=(CTime &c);  
    CTime operator-=(CTime &c);  
    CTime operator+=(int s);//返回s秒後的時間   
    CTime operator-=(int s);//返回s秒前的時間   
};  
//下面實現所有的運算符重載代碼。   
//爲簡化編程，請注意通過調用已有函數，利用好各函數之間的關係   
void CTime::setTime(int h,int m,int s)  
{  
    hour = h;  
    minute = m;  
    second = s;  
}  
  
CTime::CTime(int h,int m,int s)  
{  
    hour = h;  
    minute = m;  
    second = s;  
}  
  
  
void CTime::display()  
{  
    cout << hour << ":" << minute << ":" << second << endl;  
}  
  
    //比較運算符(二目)的重載   
bool CTime::operator > (CTime &t)  
{  
    if( (hour * 3600 + minute * 60 + second) > (t.hour * 3600 + t.minute * 60 + t.second ))  
    {  
        return true;  
    }  
    else  
    {  
        return false;  
    }  
}  
  
bool CTime::operator < (CTime &t)  
{  
    if( (hour * 3600 + minute * 60 + second) < (t.hour * 3600 + t.minute * 60 + t.second ))  
    {  
        return true;  
    }  
    else  
    {  
        return false;  
    }  
}  
  
bool CTime::operator >= (CTime &t)  
{  
    if( (hour * 3600 + minute * 60 + second) >= (t.hour * 3600 + t.minute * 60 + t.second ))  
    {  
        return true;  
    }  
    else  
    {  
        return false;  
    }  
}  
  
bool CTime::operator <= (CTime &t)  
{  
    if( (hour * 3600 + minute * 60 + second) <= (t.hour * 3600 + t.minute * 60 + t.second ))  
    {  
        return true;  
    }  
    else  
    {  
        return false;  
    }  
}  
  
bool CTime::operator == (CTime &t)  
{  
    if( (hour * 3600 + minute * 60 + second) == (t.hour * 3600 + t.minute * 60 + t.second ))  
    {  
        return true;  
    }  
    else  
    {  
        return false;  
    }  
}  
  
bool CTime::operator != (CTime &t)  
{  
    if( (hour * 3600 + minute * 60 + second) != (t.hour * 3600 + t.minute * 60 + t.second ))  
    {  
        return true;  
    }  
    else  
    {  
        return false;  
    }  
}  
    //二目運算符的重載   
CTime CTime::operator+(CTime &c)//返回c所規定的時、分、秒後的時間，例t1(8,20,25),t2(11,20,50)，t1+t2爲:41:15   
{  
int a,b, e, d;  
    CTime t;  
    a = hour * 3600 + minute * 60 + second;  
    b = c.hour * 3600 + c.minute * 60 + c.second;  
    e = a + b;  
    t.hour = e / 3600;  
    d = e % 3600;  
    t.minute = d / 60;  
    t.second = d % 60;  
    if( t.hour > 12 )  
    {  
        t.hour -= 12;  
    }  
    return t;  
}  
  
CTime CTime::operator-(CTime &c)//對照+理解   
{  
    int a,b, e, d;  
    CTime t;  
    a = hour * 3600 + minute * 60 + second;  
    b = c.hour * 3600 + c.minute * 60 + c.second;  
    e = a - b;  
    t.hour = e / 3600;  
    d = e % 3600;  
    t.minute = d / 60;  
    t.second = d % 60;  
    if( t.hour > 12 )  
    {  
        t.hour -= 12;  
    }  
    return t;  
}  
  
CTime CTime::operator+(int s)//返回s秒後的時間   
{  
    int a, c, d;  
    CTime t;  
    a = hour * 3600 + minute * 60 + second;  
    c = a + s;  
    t.hour = c / 3600;  
    d = c % 3600;  
    t.minute = d / 60;  
    t.second = d % 60;  
    if( t.hour > 12 )  
    {  
        t.hour -= 12;  
    }  
    return t;  
}  
  
CTime CTime::operator-(int s)//返回s秒前的時間   
{  
int a, c, d;  
    CTime t;  
    a = hour * 3600 + minute * 60 + second;  
    c = a - s;  
    t.hour = c / 3600;  
    d = c % 3600;  
    t.minute = d / 60;  
    t.second = d % 60;  
    if( t.hour > 12 )  
    {  
        t.hour -= 12;  
    }  
    return t;  
}  
  
    //一目運算符的重載   
CTime CTime::operator++(int)//後置++，下一秒   
{  
    CTime t(*this);  
    second++;  
    if( second >= 60)  
    {  
        second -= 60;  
        ++minute;  
        if( minute >= 60)  
        {  
            minute -= 60;  
            ++hour;  
            if( hour >= 12)  
            {  
                hour -= 12;  
            }  
        }  
    }  
    return t;  
}  
  
CTime CTime::operator++()//前置++，下一秒   
{  
      
    if( ++second >= 60)  
    {  
        second -= 60;  
        ++minute;  
        if( minute >= 60)  
        {  
            minute -= 60;  
            ++hour;  
            if( hour >= 12)  
            {  
                hour -= 12;  
            }  
        }  
    }  
    return *this;  
}  
  
CTime CTime::operator--(int)//後置--，前一秒   
{  
    CTime t(*this);  
    second--;  
    if( second < 0)  
    {  
        second = 59;  
        --minute;  
        if( minute < 0)  
        {  
            minute = 59;  
            --hour;  
            if( hour < 0)  
            {  
                hour = 11;  
            }  
        }  
    }  
    return t;  
}  
CTime CTime::operator--()//前置--，前一秒   
{  
    if( --second < 0)  
    {  
        second = 59;  
        --minute;  
        if( minute < 0)  
        {  
            minute = 59;  
            --hour;  
            if( hour < 0)  
            {  
                hour = 11;  
            }  
        }  
    }  
    return (*this);  
}  
  
    //賦值運算符的重載        
CTime CTime::operator+=(CTime &c)  
{  
     int a,b, e, d;  
      
    a = hour * 3600 + minute * 60 + second;  
    b = c.hour * 3600 + c.minute * 60 + c.second;  
    e = a + b;  
    hour = e / 3600;  
    d = e % 3600;  
    minute = d / 60;  
    second = d % 60;  
    if( hour > 12 )  
    {  
        hour -= 12;  
    }  
    return (*this);  
}  
  
CTime CTime::operator-=(CTime &c)  
{  
    int a,b, e, d;  
    //CTime t;   
    a = hour * 3600 + minute * 60 + second;  
    b = c.hour * 3600 + c.minute * 60 + c.second;  
    e = a - b;  
    hour = e / 3600;  
    d = e % 3600;  
    minute = d / 60;  
    second = d % 60;  
    if( hour > 12 )  
    {  
        hour -= 12;  
    }  
    return (*this);  
}  
  
CTime CTime::operator+=(int s)//返回s秒後的時間   
{  
      
    unsigned short int a, c, d;  
    //CTime t;   
    a = hour * 3600 + minute * 60 + second;  
    c = a + s;  
    hour = c / 3600;  
    d = c % 3600;  
    minute = d / 60;  
    second = d % 60;  
    if( hour > 12 )  
    {  
        hour -= 12;  
    }  
    return (*this);  
}  
CTime CTime::operator-=(int s)//返回s秒前的時間   
{  
    int a, c, d;  
    //CTime t;   
    a = hour * 3600 + minute * 60 + second;  
    c = a - s;  
    hour = c / 3600;  
    d = c % 3600;  
    minute = d / 60;  
    second = d % 60;  
    if( hour > 12 )  
    {  
        hour -= 12;  
    }  
    return (*this);  
}  
  
  
void main()  
{  
    CTime t1(8,20,25),t2(11,20,50),t;  
    cout<<"t1爲：";  
    t1.display();  
    cout<<"t2爲：";  
    t2.display();  
    cout<<"下面比較兩個時間大小：\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;  
    //下面自行設計對其他運算符的重載的測試   
    t = t1 + t2;  
    cout << "t1+t2 = ";  
    t.display();  
    t = t2 - t1;  
    cout << "t2-t1 = ";  
    t.display();  
    t = t1 + 30;  
    cout << "t1+30= ";  
    t.display();  
    t = t2 - 30;  
    cout <<"t2-30 = ";  
    t.display(); 
	cout<<endl;
    t = ++ t1;  
    cout << "++t1 = ";  
    t.display ();  
    cout << "t1 = ";  
    t1.display ();
	t = t1++;  
    cout << "t1++ = ";  
    t.display ();  
    cout << "t1 = ";  
    t1.display ();
    t = -- t1;  
    cout << "--t1 = ";  
    t.display ();  
    cout << "t1 = ";  
    t1.display ();  
    t = t1--;  
    cout << "t1-- = ";  
    t.display (); 
    cout<<endl;
    cout<<"t1爲：";  
    t1.display();  
    cout<<"t2爲：";  
    t2.display();  
    t2 -= t1;  
    cout << "(t2-=t1) = ";  
    t2.display ();  
    cout<<"t1爲：";  
    t1.display();  
    cout<<"t2爲：";  
    t2.display();  
    t = t2;  
    t += t1;  
    cout << "(t2+=t1) = ";  
    t.display ();  
    system("pause");  
}  

運行結果：

 

小感：真的好長啊~