时间类运算符重载示例-优快云博客

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：实现Time类中的运算符重载
* 作    者：     郭广建
* 完成日期： 2012年    04 月   10    日
* 版本号： 1.0

题目介绍：

【任务2】实现Time类中的运算符重载

#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);

    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 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;

    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

    ……


}

源程序：

#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);
    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
};
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;
}
void CTime::display()
{
	cout << '('<<hour << ','<<minute<<','<<second<<')'<<endl;
}
bool CTime::operator > (CTime &t)
{
	if(hour > t.hour)  return true;

    if(minute > t.minute) return true;

	if(second > t.second) return true;

	return false;
}
bool CTime::operator < (CTime &t)
{	
	if(hour < t.hour)  return true;

    if(minute < t.minute) return true;

	if(second < t.second) return true;

	return false;

	}
bool CTime::operator >= (CTime &t)
{	
	if(hour < t.hour)  return false;

    if(minute < t.minute) return false;

	if(second < t.second) return false;

	return true;

}
bool CTime::operator <= (CTime &t)
{	
	if(hour > t.hour)  return false;

    if(minute > t.minute) return false;

	if(second > t.second) return false;

	return true;
}
bool CTime::operator == (CTime &t)
{	
	return(hour==t.hour?true:false && minute==t.minute?true:false &&second==t.second?true:false);
}
bool CTime::operator != (CTime &t)
{	
	return(hour!=t.hour?true:false || minute!=t.minute?true:false ||second!=t.second?true:false);
}
CTime 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
{
	int s1, s2, s;

	s1 = hour *3600 + minute * 60 + second;

	s2 = c.hour*3600 + c.minute *60 + c.second;

	s = s1 + s2;

	return CTime(s/3600, (s%3600)/60, (s%3600)%60);
}
CTime CTime::operator-(CTime &c)//对照+理解
{
	int s1, s2, s;

	s1 = hour *3600 + minute * 60 + second;

	s2 = c.hour*3600 + c.minute *60 + c.second;

	s = s1 - s2;

	if(s < 0)
	{
		s += 24*3600;
	}
	return CTime(s/3600, (s%3600)/60, (s%3600)%60);
}
CTime CTime::operator+(int s)//返回s秒后的时间
{
	int s1, s2;

	s1 = hour *3600 + minute * 60 + second;

	s2 = s1 + s;

	return CTime(s2/3600, (s2%3600)/60, (s2%3600)%60);
}
CTime CTime::operator-(int s)//返回s秒前的时间
{
	int s1, s2;

	s1 = hour *3600 + minute * 60 + second;

	s2 = s1 - s;

	if(s2 < 0)
	{
		s += 24*3600;
	}
	return CTime(s2/3600, (s2%3600)/60, (s2%3600)%60);
}
CTime CTime::operator++(int)//后置++，下一秒
{
	CTime temp(*this);

	second++;

	if(second >= 60)
	{
		second = 0;

		++minute;
	}
	return temp;
}
CTime CTime::operator++()//前置++，下一秒
{
	    if(++second >= 60)
	{
		second = 0;

		++minute;
	}
	return *this;
}

CTime CTime::operator--(int)//后置--，前一秒
{
	CTime temp(*this);

	second--;

	if(second <= 60)
	{
		second = 60;

		--minute;
	}
	return temp;
}
CTime CTime::operator--()//前置--，前一秒
{
	    if(--second <= 0)
	{
		second = 60;

		--minute;
	}
	return *this;
}
CTime CTime::operator+=(CTime &c)
{
	int s1, s2, s;

	s1 = hour *3600 + minute * 60 + second;

	s2 = c.hour*3600 + c.minute *60 + c.second;

	s = s1 + s2;

	hour = s/3600;

	minute = (s%3600)/60;

	second = (s%3600)%60;

	return (hour, minute, second);
}
CTime CTime::operator-=(CTime &c)
{
	int s1, s2, s;

	s1 = hour *3600 + minute * 60 + second;

	s2 = c.hour*3600 + c.minute *60 + c.second;

	s = s1 - s2;

	if(s < 0)
	{
		s += 24*3600;
	}
	hour = s/3600;

	minute = (s%3600)/60;

	second = (s%3600)%60;

	return (hour, minute, second);
}
CTime CTime::operator+=(int s)//返回s秒后的时间
{
	int s1, s2;

	s1 = hour *3600 + minute * 60 + second;

	s2 = s1 + s;

	hour = s2/3600;

	minute = (s2%3600)/60;

	second = (s2%3600)%60;

	return (hour, minute, second);
}
CTime CTime::operator-=(int s)//返回s秒前的时间
{
	int s1, s2;

	s1 = hour *3600 + minute * 60 + second;

	s2 = s1 - s;

	if(s2 < 0)
	{
		s2 += 24*3600;
	}
	hour = s2/3600;

	minute = (s2%3600)/60;

	second = (s2%3600)%60;

	return (hour, minute, second);
}
void 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;
    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 = ";

	t.display();

	t = t1 - t2;

	cout << "t1-t2 = ";

	t.display();

	t = t1 + 500;

	cout << "t1+500 = ";

	t.display();

	t = t1 - 500;

	cout << "t1-500 = ";

	t.display();

	++t1;

	cout << "++t1 = ";

	t1.display();

	--t1;

	cout<< "--t1 = ";

	t1.display ();

	t1 += t2;

	cout << "t1+=t2 = ";

	t1.display();

	t1 -= t2;

	cout << "t1-=t2 = ";

	t1.display();

	t2 += 500;

	cout <<"t2+=500 = ";

	t2.display();

	t2 -= 500;

	cout << "t2-=500 = ";

	t2.display();

    system("pause");
}

运行结果：

第八周实验报告（任务2）