第九周项目二：定义Time类中的<<和>>运算符重载

最新推荐文章于 2024-06-26 01:02:42 发布

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CC 4.0 BY-SA版权

该篇博客详细介绍了如何在C++中定义一个名为CTime的类，该类用于表示时间，并重载了包括<<、>>在内的多个运算符。这些运算符包括比较运算符（>、<、>=、<=、==、!=）、加减运算符以及前置和后置自增、自减运算符。此外，还实现了时间的相加、相减、以及秒数的增加和减少功能。博客中提供了完整的源代码示例，展示了如何实现这些运算符的功能。

/*
* 程序的版权和版本声明部分
* Copyright (c)2012, 烟台大学计算机学院学生
* All rightsreserved.
* 作者：    李洋
* 完成日期： 2013年 5 月 7 日
* 版本号： v1.0
* 输入描述：无
* 问题描述：无
* 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);
	void setTime(int h,int m,int s);
	friend istream&operator>>(istream &,CTime &);
	friend ostream&operator<<(ostream &,CTime &);
	//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，前置与后置返回值不一样
	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);
	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

istream&operator>>(istream &input,CTime &t)
{
    cout<<"请输入时间（格式：时、分、秒）：";
    input>>t.hour>>t.minute>>t.second;
    return input;
}

ostream&operator<<(ostream &output,CTime &t)
{
    output<<t.hour<<":"<<t.minute<<":"<<t.second<<endl;
    return output;
}

 CTime::CTime(int h,int m,int s)
{
	hour=h;
	minute=m;
	second=s;
}
void CTime::setTime(int h,int m,int s)
{
	hour=h;
	minute=m;
	second=s;
}

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;
}
CTime CTime::operator+(CTime &c)
{
    CTime t;
	int times;
	times=(hour*3600+minute*60+second)+(c.hour*3600+c.minute*60+c.second);
	t.hour=times/3600;
	if(t.hour>=24)
    {
        t.hour-=24;
    }
	times%=3600;
	t.minute=times/60;
	times%=60;
	t.second=times;
	return t;
}

CTime CTime::operator-(CTime &c)
{
    CTime t;
	int times;
	times=(hour*3600+minute*60+second)-(c.hour*3600+c.minute*60+c.second);
	if(times<0)
	{
		times=-times;
	}
	t.hour=times/3600;
	if(t.hour>=24)
    {
        t.hour-=24;
    }
	times%=3600;
	t.minute=times/60;
	times%=60;
	t.second=times;
	return t;
}
CTime CTime::operator+(int s)
{
    CTime t;
    int times;
    times=hour*3600+minute*60+second+s;
    t.hour=times/3600;
    if(t.hour>=24)
    {
        t.hour-=24;
    }
	times%=3600;
	t.minute=times/60;
	times%=60;
	t.second=times;
	return t;
}
CTime CTime::operator-(int s)
{
    CTime t;
    int times;
    times=hour*3600+minute*60+second-s;
    t.hour=times/3600;
    if(t.hour>=24)
    {
        t.hour-=24;
    }
	times%=3600;
	t.minute=times/60;
	times%=60;
	t.second=times;
	return t;
}
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--(int)
{
    CTime t(*this);
	second--;
	if(second<0)
	{
		second+=60;
		--minute;
	}
	if(minute<0)
	{
		minute+=60;
		--hour;
	}
	if(hour<0)
	{
		hour+=24;
	}
	return t;
}
CTime CTime::operator--( )
{
    if(--second<0)
    {
        second+=60;
        --minute;
    }
    if(minute<0)
    {
        minute+=60;
        --hour;
    }
    if(hour<0)
    {
        hour+=24;
    }
    return *this;
}
CTime CTime::operator+=(CTime &c)
{
	int times;
	times=hour*3600+minute*60+second+(c.hour*3600+c.minute*60+c.second);
	hour=times/3600;
	times=times%3600;
	minute=times/60;
	times=times%60;
	second=times;
	return *this;
}
CTime CTime::operator-=(CTime &c)
{
	int times;
	times=hour*3600+minute*60+second-(c.hour*3600+c.minute*60+c.second);
	if(times<0)
	{
		times=-times;
	}
	hour=times/3600;
	if(hour>=24)
	{
		hour-=24;
	}
	times=times%3600;
	minute=times/60;
	times=times%60;
	second=times;
	return *this;
}
CTime CTime::operator+=(int s)
{
	second+=s;
	if(second>=60)
	{
		second-=60;
		++minute;
	}
	if(minute>=60)
	{
		minute-=60;
		++hour;
	}
	if(hour>=24)
	{
		hour-=24;
	}
	return *this;
}
CTime CTime::operator-=(int s)
{
    int times;
    times=hour*3600+minute*60+second-s;
    if(times<0)
    {
        times=-times;
    }
    hour=times/3600;
    if(hour>=24)
    {
        hour-=24;
    }
	times=times%3600;
	minute=times/60;
	times=times%60;
	second=times;
	return *this;
}
int main()
{
	CTime t1,t2,t3;
	cin>>t1;
	cout<<"t1为：";
	cout<<t1;

	cin>>t2;
	cout<<"t2为：";
	cout<<t2;

	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;

    t3=t1+t2;
	cout<<"t1+t2= ";
	cout<<t3;

	t3=t1-t2;
	cout<<"t1-t2= ";
	cout<<t3;

	t3=t1+20;
	cout<<"t1+20s= ";
	cout<<t3;

	t3=t1-20;
	cout<<"t1-20s= ";
	cout<<t3;

	t3=t1++;
	cout<<"t1++= ";
	cout<<t1;
	cout<<"执行t1++之前的值为：";
    cout<<t3;

	++t1;
	cout<<"++t1= ";
	cout<<t1;


	t3=t1--;
	cout<<"t1--= ";
	cout<<t1;
	cout<<"执行t1--之前的值为：";
	cout<<t3;

	--t1;
	cout<<"--t1= ";
	cout<<t1;

	t1+=t2;
	cout<<"t1+=t2= ";
	cout<<t1;

	t1-=t2;
	cout<<"t1-=t2= ";
	cout<<t1;

	t1+=20;
	cout<<"t1+=20s= ";
	cout<<t1;

	t1-=40;
	cout<<"t1-=40s= ";
	cout<<t1;

	return 0;
}