项目二、

/* 
02.* 程序的版权和版本声明部分 
03.* Copyright (c)2012, 烟台大学计算机学院学生 
04.* All rightsreserved. 
05.* 作者：   董万鹏
06.* 完成日期： 2013年 4 月 22 日 
07.* 版本号： v1.0 
08.* 输入描述：无 
09.* 问题描述：无 
10.* 程序输出：无 
*/
#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);
    //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，前置与后置返回值不一样
    //赋值运算符的重载
	CTime operator+=(CTime &c);
	CTime operator+=(int s);
};
//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()
{
    if(second>60)
    {
        int t=second/60;
        second%=60;
        minute+=t;
    }
    if(minute>60)
    {
        int x=minute/60;
        minute%=60;
        hour+=x;
    }
    if(hour>24)
    {
        hour%=24;
    }
    cout<<hour<<"点"<<minute<<"分"<<second<<"秒"<<endl;
}
bool CTime::operator>(CTime &t)
{
    if(hour>t.hour)
        return true;
    else if(hour<t.hour)
        return false;
    else
    {
        if(minute>t.minute)
            return true;
        else if(minute<t.minute)
            return false;
        else
        {
            if(second>t.second)
                return true;
            else
                return false;
        }
    }
}
bool CTime::operator<(CTime &t)
{
    if(hour<t.hour)
        return true;
    else if(hour>t.hour)
        return false;
    else
    {
        if(minute<t.minute)
            return true;
        else if(minute>t.minute)
            return false;
        else
        {
            if(second<t.second)
                return true;
            else
                return false;
        }
    }
}
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(hour!=t.hour || minute!=t.minute ||second!=t.second)
        return true;
    else
        return false;
}

CTime CTime::operator+(CTime &c)
{
    CTime c1;
    c1.hour=hour+c.hour;
    c1.minute=minute+c.minute;
    c1.second=second+c.second;
    return c1;
}
CTime CTime::operator-(CTime &c)
{
    CTime c1;
    c1.hour=hour-c.hour;
    c1.minute=minute-c.minute;
    c1.second=second-c.second;
    return c1;
}
CTime CTime::operator+(int s)
{
    CTime t1;
    cout<<"t1增加"<<s<<"秒后的时间是:"<<endl;
    t1.hour=hour;
    t1.minute=minute;
    t1.second=second+s;
    return t1;
}
CTime CTime::operator-(int s)
{
    CTime t1;
    int num=0;
    cout<<"t1减少"<<s<<"秒后的时间是:"<<endl;
    t1.hour=hour;
    t1.minute=minute;
    t1.second=second;
    while(t1.second<s)
    {
		t1.second+=60;
		++num;
    }
    t1.minute-=num;
    t1.second-=s;
    return t1;
}

CTime CTime::operator++(int)
{
    CTime t(*this);  
    second++;  
    if(second>=60)  
    {  
        second-=60;  
        ++minute;  
    }  
    if(minute>=60)  
    {  
       minute-=60;  
        ++hour;  
    }  
    if(hour>23)  
    {  
        hour-=24;  
    }  
    return t;  
}

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

CTime CTime::operator+=(CTime &c)
{
    CTime c1;
    c1.hour=hour+c.hour;
    c1.minute=minute+c.minute;
    c1.second=second+c.second;
    return c1;
}
CTime CTime::operator+=(int s)
{
	second+=s;    
    return *this;
}


int main()
{
    CTime t1(8,20,25),t2(11,20,50),t;
    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＝t2"<<endl;
    if (t1!=t2) cout<<"t1≠t2"<<endl;
	
    t=t1+t2;
    cout<<"t1+t2后的时间是:";
    t.display();
	
    if(t1>t2)
    {
        t=t1-t2;
        cout<<"t1-t2后的时间是:";
        t.display();
    }
    else
    {
        t=t2-t1;
        cout<<"t2-t1后的时间是:";
        t.display();
    }
	
    t=t1+80;
    t.display();
	
    t=t1-100;
    t.display();
	
    t=t1++;
	cout<<"t1++=";
    t1.display();
	cout<<"执行t1++之前的值为:";
	t.display();
	
    ++t1;  
    cout<<"++t1= ";  
    t1.display();  

	t1+=t2;
	cout<<"t1+=t2为:"<<endl;
	t1.display();

    t2+=5;
	cout<<"t2+=5为:"<<endl;
	t2.display();
	return 0;
}