第9周任务2（定义CTime类中的<<和>>运算符的重载）

一时失言乱红尘 2022-06-13 12:41 150阅读 0赞

/* (程序头部注释开始)
    * 程序的版权和版本声明部分
    * Copyright (c) 2011, 烟台大学计算机学院学生 
    * All rights reserved.
    * 文件名称：                              
    * 作    者：   臧鹏               
    * 完成日期：   2012   年  4 月 15  日
    * 版 本 号：          
    
    * 对任务及求解方法的描述部分
    * 输入描述：
    * 问题描述：在第8周任务2的基础上，定义CTime类中的<<和>>运算符的重载，实现输入和输出，改造原程序中队运算结果的显示方式，使程序更自然。
    * 程序输出： 
    * 程序头部的注释结束
    */
    #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 
    	friend istream & operator >> (istream &in,CTime &c);//重载>>
    	friend ostream & operator << (ostream &out,CTime &c);//重载<<
    };  
    //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()//显示函数  
    {  
    cout<< hour << ":" << minute << ":"  << second << endl;  
    }  
    */
    
    bool CTime::operator > (CTime &t)//大于比较符（把时间都化成秒进行比较要容易得多，下同）  
    {  
    	if(hour*3600+minute*60+second >t.hour*3600+t.minute*60+t.second)  
    	{  
    		return true;  
    	}  
    	else  
    		return false;  
    }  
    bool CTime::operator < (CTime &t)//小于比较符  
    {  
    	if(hour*3600+minute*60+second <t.hour*3600+t.minute*60+t.second)  
    	{  
    		return true;  
    	}  
    	else  
    		return false;  
    }  
    bool CTime::operator >= (CTime &t)//大于等于比较符  
    {  
    	if(hour*3600+minute*60+second >= t.hour*3600+t.minute*60+t.second)  
    	{  
    		return true;  
    	}  
    	else  
    		return false;  
    }  
    bool CTime::operator <= (CTime &t)//小于等于比较符  
    {  
    	if(hour*3600+minute*60+second <= t.hour*3600+t.minute*60+t.second)  
    	{  
    		return true;  
    	}  
    	else  
    		return false;  
    }  
    bool CTime::operator == (CTime &t)//等于比较符  
    {  
    	if(hour == t.hour && minute == t.minute && second == t.second)  
    	{  
    		return true;  
    	}  
    	else  
    		return false;  
    }  
    bool CTime::operator != (CTime &t)//不等于  
    {  
    	if(hour != t.hour ||minute != t.minute || second != t.second)  
    	{  
    		return true;  
    	}  
    	else  
    		return false;  
    }  
    //二目运算符的重载  
    CTime CTime::operator+(CTime &t)//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 t1;  
    	int time;  
    	time = hour*3600+minute*60+second+t.hour*3600+t.minute*60+t.second;//利用中间变量，把时间都化成秒在进行运算，再化成时分秒，下同  
    	t1.hour=time/3600;  
    	time =time%3600;  
    	t1.minute =time/60;  
    	time = time%60;  
    	t1.second =time;  
    	return t1;  
    }  
    
    CTime CTime::operator-(CTime &t)//对照+理解  
    {  
    	CTime t1;  
    	int time;  
    	time = hour*3600+minute*60+second-(t.hour*3600+t.minute*60+t.second);  
    	if(time<0)  
    	{  
    		time = -time;  
    	}  
    	t1.hour=time/3600;  
    	time =time%3600;  
    	t1.minute =time/60;  
    	time = time%60;  
    	t1.second =time;  
    	return t1;  
    }  
    CTime CTime::operator+(int s)//返回s秒后的时间  
    {  
    	CTime t0;//利用一个中间变量是防止函数把this指针所指向的这个对象改变，此处不能用const，否则运行函数无效  
    	int time = hour * 3600 + minute * 60 + second + s;   
    
    	t0.hour = time / 3600;   
    
    	time = time % 3600;   
    
    	t0.minute = time / 60;   
    
    	time = time % 60;   
    
    	t0.second = time;     
    
    	return t0; //返回中间变量，如果返回（*this）则下个函数的默认对象就为这个函数所改变后的对象  
    }  
    CTime CTime::operator-(int s)//返回s秒前的时间  
    {  
    	CTime t0;  
    
    	int time = hour * 3600 + minute * 60 + second-s;     
    
    	t0.hour = time / 3600;   
    
    	time = time % 3600;   
    
    	t0.minute = time / 60;   
    
    	time = time % 60;   
    
    	t0.second = time;   
    
    	return t0;   
    }  
    //一目运算符的重载  
    CTime CTime::operator++(int)//后置++，下一秒  
    {  
    	CTime temp(*this);//提前保存this指针所指向的这个对象  
    	{  
    		second++;  
    		if(second>=60)  
    		{  
    			second-=60;  
    			++minute;  
    			if(minute>=60)  
    			{  
    				minute-=60;  
    				++hour;  
    			}  
    		}  
    
    	}  
    	return temp;//返回的对象为改之前的，但实际对象已经改变了  
    }  
    CTime CTime::operator++()//前置++，下一秒  
    {  
    	if(++second>=60)  
    	{  
    		second-=60;  
    		++minute;  
    		if(minute>=60)//注意分钟也可能越界  
    		{  
    			minute-=60;  
    			++hour;  
    		}  
    	}  
    	return (*this);  
    }  
    CTime CTime::operator--(int)//后置--，前一秒  
    {  
    	CTime temp(*this);  
    	second--;  
    	if(second<0)//秒被减成负的那么要考虑分钟减一。秒数为60-second  
    	{     
    		second = 60+second;  
    		--minute;  
    		if(minute<0)  
    		{  
    			--hour;  
    		}  
    	}  
    	return temp;  
    }  
    CTime CTime::operator--()//前置--，前一秒  
    {  
    	if(--second<0)  
    	{  
    		second =60+second;  
    		--minute;  
    		if(minute<0)  
    		{  
    			--hour;  
    		}  
    	}  
    	return (*this);  
    }  
    //赋值运算符的重载       
    CTime CTime::operator+=(CTime &t)  
    {  
    	int time;  
    	time = hour*3600+minute*60+second+t.hour*3600+t.minute*60+t.second;  
    	hour = time/3600;  
    	if(hour>=24)//如果小时大于24，自动归零  
    	{  
    		hour-=24;  
    	}  
    	time = time%3600;  
    	minute = time/60;  
    	time = time%60;  
    	second = time;  
    	return  (*this);  
    }  
    CTime CTime::operator-=(CTime &t)  
    {  
    	int time;  
    	time = hour*3600+minute*60+second-(t.hour*3600+t.minute*60+t.second);  
    	if (time<0)  
    	{  
    		time = -time;  
    	}  
    	hour = time/3600;  
    	if(hour>=24)  
    	{  
    		hour-=24;  
    	}  
    	time = time%3600;  
    	minute = time/60;  
    	time = time%60;  
    	second = time;  
    	return  (*this);  
    }  
    CTime CTime::operator+=(int s)//返回s秒后的时间  
    {  
    
    	second+=s;  
    	if(second>=60)  
    	{  
    		minute+=second/60;  
    		second = second%60;  
    	}  
    	if(minute>=60)  
    	{  
    		hour+=minute/60;  
    		minute=minute%60;  
    	}  
    	if(hour>=24)  
    	{  
    		hour = hour%24;  
    	}  
    	return  (*this);  
    }  
    CTime CTime::operator-=(int s)//返回s秒前的时间  
    {  
    	int time;  
    	time = hour*3600+minute*60+second-s;  
    	if(time<0)  
    	{  
    		time = -time;  
    	}  
    	else  
    		hour = time/3600;  
    	time = time%3600;  
    	minute = time/60;  
    	time = time%60;  
    	second = time;  
    	return (*this);  
    }
    istream & operator >> (istream &in,CTime &c)//重载>>
    {
    	char a1,a2;
    	cout<<"请输入时间（格式：xx:xx:xx）"<<endl;
    	//cin>>c.hour>>a1>>c.minute>>a2>>c.second;
    	while(1)
    	{
    		cin>>c.hour>>a1>>c.minute>>a2>>c.second;
    		if(a1!=':'||a2!=':')
    		{
    
    			cout<<"格式不正确，请重新输入";//此处要注意，先是continue结束本次循环，直到格式正确了才break
    			continue;
    		}
    		else break;
    
    
    	}
    	return cin;
    }
    
    ostream & operator << (ostream &out,CTime &c)//重载<<
    {
    	out<<c.hour<<':'<<c.minute<<':'<<c.second<<endl;
    	return out;
    }
    
    
    
    void main()  
    {  
    	CTime t1,t2,t;  
    	cout<<"请输入时间t1:";  
    	cin>>t1;  
    	cout<<"请输入时间t2";  
    	cin>>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 =";  
    	cout<<t;  
    
    	t = t1-t2;  
    	cout<<"t1-t2 =";  
    	cout<<t;  
    
    	t = t1+15;  
    	cout<<"t1+15s =";  
    	cout<<t;  
    
    	t = t1-15;  
    	cout<<"t1-15s =";  
    	cout<<t;  
    
    	t = t1++;  
    	cout<<"t1++ =";  
    	cout<<t;  
    
    	t = ++t1;  
    	cout<<"++t1 =";  
    	cout<<t;  
    
    	t = t1--;  
    	cout<<"t1-- =";  
    	cout<<t;  
    
    	t = --t1;  
    	cout<<"--t1 =";  
    	cout<<t;  
    	t1+=t2;  
    	cout<<"t1+=t2  =";  
    	cout<<t1;  
    	t1-=t2;  
    	cout<<"t1-=t2  =";  
    	cout<<t1;  
    	t1 +=124;  
    	cout<<"t1+=124s =";  
    	cout<<t1;  
    	t1 -=555;  
    	cout<<"t1-=555s =";  
    	cout<<t1; 
    	system("pause");  
    
    
    }

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[1334497612_6476.png]: https://img-my.csdn.net/uploads/201204/15/1334497612_6476.png