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第九周项目2-Time类运算符重载

/*
*程序的版权和版本声明部分:
*Copyright(c)2014,烟台大学计算机学院学生
*All rights reserved.
*文件名称:
*作者:田成琳
*完成日期:2014  年 4 月 22 日
*版本号:v1.0
*对任务及求解方法的描述部分:
*输入描述:无
*问题描述:Time类模板,+,-,+=,-=的重载
*程序输出:- -
*问题分析:
*算法设计:
*/
#include<iostream.h>
//using namespace std;
class CTime
{
private:
    int hour;    // 时
    int minute;  // 分
    int second;  // 秒
public:
    CTime(int h=0,int m=0,int s=0);
    void setTime(int h,int m,int s);
    //二目的比较运算符重载
    bool operator > (CTime &t);
    bool operator < (CTime &t);
    bool operator >= (CTime &t);
    bool operator <= (CTime &t);
    bool operator == (CTime &t);
    bool operator != (CTime &t);
    //二目的加减运算符的重载
    //返回t规定的时、分、秒后的时间,
    //例t1(8,20,25),t2(11,20,50),t1+t2为:19:41:15
    CTime operator+(CTime &t);
    CTime operator-(CTime &t);//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
	
	
    //二目赋值运算符的重载
    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
	
	//一目运算符
	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
	
	//输入输出流
	friend istream & operator>>(istream &input,CTime &t);
	friend ostream & operator<<(ostream &output,CTime &t);
};
//下面实现所有的运算符重载代码。
CTime CTime::operator++(int)
{
	CTime t=*this;
	if(second++>=60)
	{
		second-=60;
		minute++;
		if(minute>=60)
		{
			minute-=60;
			hour++;
		}
	}
	return t;
}
CTime CTime::operator++()
{
	if(second++>=60)
	{
		second-=60;
		minute++;
		if(minute>=60)
		{
			minute-=60;
			hour++;
		}
	}
	return *this;
}
CTime CTime::operator--(int)
{
	CTime t=*this;
	if(--second<0)
	{
		second+=60;
		--minute;
		if(minute<60)
		{
			minute+=60;
			--hour;
		}
	}
	return t;
}
CTime CTime::operator--()
{	
	if(--second<0)
	{
		second+=60;
		--minute;
		if(minute<0)
		{
			minute+=60;
			--hour;
		}
	}
	return *this;
}
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>t.hour) 
		return true;
	if (hour<t.hour) 
		return false;
	if (minute>t.minute) 
		return true;
	if (minute<t.minute) 
		return false;
	if (second>t.second) 
		return true;
	return false;
}
bool CTime::operator < (CTime &t)
{
	if (hour<t.hour)
		return true;
	if (hour>t.hour)
		return false;
	if (minute<t.minute)
		return true;
	if (minute>t.minute)
		return false;
	if (second<t.second)
		return true;
	return false;
}
bool CTime::operator == (CTime &t)
{
	if (*this<t || *this>t) 
		return false;
	return true;
}
bool CTime::operator != (CTime &t)
{
	if (*this==t) 
		return false;
	return true;
}
bool CTime::operator >= (CTime &t)
{
	if (*this<t) 
		return false;
	return true;
}
bool CTime::operator <= (CTime &t)
{
	if (*this>t) 
		return false;
	return true;
}
CTime CTime::operator+(CTime &t)
{
	int s,m,h;
    s=second+t.second;
	m=minute+t.minute;
	h=hour+t.hour;
    while(s>=60)
    {
        s-=60;
        m++;
    }
    while(m>=60)
    {
        m-=60;
        h++;
    }
    while(h>=24)
        h-=24;
    CTime t1(h,m,s);
	return t1;
}
CTime CTime::operator-(CTime &t)
{
	int s,m,h;
    s=second-t.second;
	m=minute-t.minute;
	h=hour-t.hour;
    if(s<0)
    {
        s+=60;
        m--;
    }
    if(m<0)
    {
        m+=60;
        h--;
    }
    while(h<0)
        h+=24;
    CTime t1(h,m,s);
	return t1;
}
CTime CTime::operator+(int s)
{
    int sec,min,hou;
	sec=s%60;
	min=(s/60)%60;
	hou=s/3600;
	CTime t(hou,min,hou);
	return *this+t;
}
CTime CTime::operator-(int s)
{
    int sec,min,hou;
	sec=s%60;
	min=(s/60)%60;
	hou=s/3600;
	CTime t(hou,min,hou);
	return *this-t;
}
CTime CTime::operator+=(CTime &t)
{
	second+=t.second;
	minute+=t.minute;
	hour+=t.hour;
    while(second>=60)
    {
        second-=60;
        minute++;
    }
    while(minute>=60)
    {
        minute-=60;
        hour++;
    }
    while(hour>=24)
        hour-=24;
	CTime t1(hour,minute,second);
	return t1;
	
}
CTime CTime::operator-=(CTime &t)
{
	second-=t.second;
	minute-=t.minute;
	hour-=t.hour;
    while(second<0)
    {
        second+=60;
        minute--;
    }
    while(minute<0)
    {
        minute++;
        hour--;
    }
    while(hour<0)
        hour+=24;
	CTime t1(hour,minute,second);
	return t1;
}
CTime CTime::operator+=(int s)
{
	second+=s;
	while(second>60)
	{
		second-=60;
		minute++;
		while(minute>60)
		{
			minute-=60;
			hour++;
		}
	}
	return CTime(hour,minute,second);
}
CTime CTime::operator-=(int s)
{
	second-=s;
	while(second<0)
	{
		second+=60;
		minute--;
		while(minute<0)
		{
			minute+=60;
			hour--;
		}
	}
	return CTime(hour,minute,second);
}
istream & operator>>(istream &input,CTime &t)
{
	int h,m,s;
	char sign;
	do
	{
		input>>h>>sign>>m>>sign>>s;
	}
	while(h>24||m>60||s>60||sign!=':');
	t.hour=h;
	t.minute=m;
	t.second=s;
	return input;
}
ostream & operator<<(ostream &output,CTime &t)
{
	output<<t.hour<<":"<<t.minute<<":"<<t.second<<endl;
	return output;
}
int main()
{
	CTime t1,t2,t;
	cout<<"t1为:";
	cin>>t1;
	cout<<"t2为:";
	cin>>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;
	cout<<"t1= "<<t1<<endl;
	cout<<"t2= "<<t2<<endl;
	cout<<"t=t1++"<<endl;
	t=t1++;
	cout<<"t= "<<t<<"t1= "<<t1<<endl;
	cout<<"t=++t1"<<endl;
	t=++t1;
	cout<<"t= "<<t<<"t1= "<<t1<<endl;
	cout<<"t1+t2= "<<t1+t2<<endl;
	cout<<"t1-t2= "<<t1-t2<<endl;
	cout<<"t1+2000= "<<t1+2000<<endl;
	cout<<"t1-5000= "<<t1-5000<<endl;
	return 0;
}

运行结果:

心得体会:。

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