/* (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：定义Time类中的<<和>>运算符重载，实现时间的输入输出，改造原程序中对运算结果显示方式，使程序读起来更自然。
* 作 者： 陶锋
* 完成日期： 2012 年 04 月 16日
* 版 本 号： V1.0
* 对任务及求解方法的描述部分
* 输入描述：
* 问题描述：
* 程序输出：
* 程序头部的注释结束
*/
#include <iostream.h>
class CTime
{
private:
unsigned short int hour; // 时
unsigned short int minute; // 分
unsigned short int second; // 秒
char unknown; //':'的符号
public:
CTime(int h=0,int m=0,int s=0);
// void setTime(int h,int m,int s);
//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
//重载流插入运算符“<<”
friend ostream& operator << (ostream&,CTime&);
//重载流提取运算符“>>”
friend istream& operator >> (istream&,CTime&);
};
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;
} */
//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
//比较运算符(二目)的重载
ostream& operator << (ostream&output,CTime&c)
{
output<<c.hour <<":"<<c.minute <<":"<<c.second <<endl;
return output;
}
istream& operator >> (istream& input,CTime & c)
{
input>>c.hour>>c.unknown >>c.minute>>c.unknown >>c.second;
return input;
}
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;
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 if(second>t.second )
return false;
return false;
}
bool CTime::operator >= (CTime &t)
{
CTime t1;
t1.hour =hour;
t1.minute =minute ;
t1.second =second ;
if (t1<t)
return false;
return true;
}
bool CTime::operator <= (CTime &t)
{
CTime t1;
t1.hour =hour;
t1.minute =minute ;
t1.second =second ;
if (t1>t)
return false;
return true;
}
bool CTime::operator == (CTime &t)
{
CTime t1;
t1.hour =hour;
t1.minute =minute ;
t1.second =second ;
if (t1>t)
return false;
if (t1<t)
return false;
return true;
}
bool CTime::operator != (CTime &t)
{
CTime t1;
t1.hour =hour;
t1.minute =minute ;
t1.second =second ;
if(t1==t)
return false;
return true;
}
//二目运算符的重载
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
{
CTime c2;
int time;
time = (hour * 3600 + minute * 60 + second) + (c.hour * 3600 + c.minute * 60 + c.second);
c2.hour = time / 3600;
time = time % 3600;
c2.minute = time / 60;
time = time % 60;
c2.second = time;
return c2;
}
CTime CTime::operator-(CTime &c)//对照+理解
{
CTime c2;
int time;
time = (hour * 3600 + minute * 60 + second) - (c.hour * 3600 + c.minute * 60 + c.second);
c2.hour = time / 3600;
time = time % 3600;
c2.minute = time / 60;
time = time % 60;
c2.second = time;
return c2;
}
CTime CTime::operator+(int s)//返回s秒后的时间
{
int time = hour * 3600 + minute * 60 + second + s;
hour = time / 3600;
time = time % 3600;
minute = time / 60;
time = time % 60;
second = time;
return (*this);
}
CTime CTime::operator-(int s)//返回s秒前的时间
{
int time = hour * 3600 + minute * 60 + second;
time = time - s;
hour = time / 3600;
time = time % 3600;
minute = time / 60;
time = time % 60;
second = time;
return (*this);
}
//一目运算符的重载
CTime CTime::operator++(int)//后置++，下一秒
{
CTime temp(*this);
second++;
if(second>=60)
{
second-=60;
++minute;
}
return temp;
}
CTime CTime::operator++()//前置++，下一秒
{
if(++second>=60)
{
second-=60;
++minute;
}
return *this;
}
CTime CTime::operator--(int)//后置--，前一秒
{
CTime temp(*this);
second--;
if(second<0)
{
second=59;
--minute;
}
return temp;
}
CTime CTime::operator--()//前置--，前一秒
{
if(--second<0)
{
second=59;
--minute;
}
return *this;
}
//赋值运算符的重载
CTime CTime::operator+=(CTime &c)
{
CTime t1,t;
t1.hour =hour;
t1.minute =minute ;
t1.second =second ;
t=t1+c;
hour=t.hour ;
minute=t.minute ;
second=t.second ;
return t;
}
CTime CTime::operator-=(CTime &c)
{
*this=*this-c;
return *this;
}
CTime CTime::operator+=(int s)//返回s秒后的时间
{
CTime t1,t;
t1.hour =hour;
t1.minute =minute ;
t1.second =second ;
t=t1+s;
hour=t.hour ;
minute=t.minute ;
second=t.second ;
return t;
}
CTime CTime::operator-=(int s)//返回s秒前的时间
{
*this=*this-s;
return *this;
}
void main()
{
CTime t1,t2,t;
int n;
cout<<"请输入t1的时间：（以aa:bb:cc的格式输入）";
cin>>t1;
cout<<"请输入t2的时间：（以aa:bb:cc的格式输入）";
cin>>t2;
cout<<"t1为：";
cout<<t1;
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;
cout<<"t1+t2的时间为：";
t=t1+t2;
cout<<t;
cout<<"t2-t1的时间为：";
t=t2-t1;
cout<<t;
cout<<endl;
cout<<"请输入您想增加的秒数：";
cin>>n;
t=t1+n;
cout<<"增加"<<n<<"秒后的时间为：";
cout<<t;
t=t1-n;
cout<<"增加"<<n<<"秒前的时间为：";
cout<<t;
cout<<endl;
cout<<"对t1后置++,结果为：";
t=t1++;
cout<<t;
cout<<"运算结束后，t1的值为：";
cout<<t1;
cout<<endl;
cout<<"对t1前置++,结果为：";
t=++t1;
cout<<t;
cout<<"运算结束后，t1的值为：";
cout<<t1;
cout<<endl;
cout<<"对t1后置--,结果为：";
t=t1--;
cout<<t;
cout<<"运算结束后，t1的值为：";
cout<<t1;
cout<<endl;
cout<<"对t1前置--,结果为：";
t=--t1;
cout<<t;
cout<<"运算结束后，t1的值为：";
cout<<t1;
cout<<endl;
cout<<"运算t1+=t2的结果为：";
t1+=t2;
cout<<t1;
cout<<endl;
cout<<"此时t1的值为：";
cout<<t1;
cout<<"此时t2的值为：";
cout<<t2;
cout<<endl;
cout<<"运算t1-=t2的结果为：";
t1-=t2;
cout<<t1;
cout<<"此时t1的值为：";
cout<<t1;
cout<<"此时t2的值为：";
cout<<t2;
cout<<endl;
cout<<"请输入您想增加的秒数：";
cin>>n;
t1+=n;
cout<<"t1增加"<<n<<"秒后的时间为：";
cout<<t1;
cout<<"t2增加"<<n<<"秒前的时间为：";
t2-=n;
cout<<t2;
cout<<endl;
}
