Unit9-problem2 时间类

/*Univercity:烟台大学
*@Class</A>计134~4
*@Author:薛富磊
*@Time:2014-4-28
*@Function:
*@Args:
*@Return:
*/
#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();
//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);
//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
//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: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
};
//下面实现所有的运算符重载代码。
void CTime::setTime(int h,int m,int s)
{
hour=h;
minute=m;
second=s;
}
void CTime::display()
{
cout<<hour<<":"<<minute<<":"<<second<<endl;
}
//二目的比较运算符重载
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(*this<t)
return false;
else
return true;
}
bool CTime::operator <= (CTime &t)
{
if(*this>t)
return false;
else
return true;
}
bool CTime::operator == (CTime &t)
{
if(*this<t||*this>t)
return false;
else
return true;
}
bool CTime::operator != (CTime &t)
{
if(*this<t||*this>t)
return true;
else
return false;
}
//一目运算符的重载
CTime CTime::operator++(int)//后置++，下一秒
{
CTime t=*this;
*this=*this+1;
return t;
}

CTime CTime::operator++()//前置++，下一秒
{
*this=*this+1;
return *this;
}

CTime CTime::operator--(int)//后置--，前一秒
{
CTime t=*this;
*this=*this-1;
return t;
}

CTime CTime::operator--()//前置--，前一秒
{
*this=*this-1;
return *this;
}
//二目的加减运算符的重载
CTime CTime::operator+(CTime &t)
{
CTime c;
c.hour=hour+t.hour;
c.minute=minute+t.minute;
c.second=second+t.second;
if(c.hour>=24)
c.hour=c.hour-24;
if(c.minute>=60)
{
c.hour+=1;
c.minute=c.minute-60;
}
if(c.second>=60)
{
c.minute+=1;
c.second=c.second-60;
}
return c;
}
CTime CTime::operator-(CTime &t)
{
CTime c;
if(hour-t.hour<=0)
c.hour=24-t.hour+hour;
else
c.hour=hour-t.hour;
if(minute-t.minute<0)
{
c.hour-=1;
c.minute=60-t.minute+minute;
}
else
c.minute=minute-t.minute;
if(second-t.second<0)
{
c.minute-=1;
c.second=60-t.second+second;
}
else
c.second=second-t.second;

return c;
}
CTime  CTime::operator+(int s)
{
CTime c;
int d;
d=hour*3600+minute*60+second+s;
c.hour=d/3600;
c.minute=(d%3600)/60;
c.second=(d%3600)%60;
return c;
}
CTime  CTime::operator-(int s)
{
CTime c;
int d;
d=hour*3600+minute*60+second-s;
c.hour=d/3600;
c.minute=(d%3600)/60;
c.second=(d%3600)%60;
return c;
}
//二目赋值运算符的重载
CTime CTime::operator+=(CTime &t)
{
*this=*this+t;
return *this;
}
CTime CTime::operator-=(CTime &t)
{
*this=*this-t;
return *this;
}
CTime  CTime::operator+=(int s)
{
*this=*this+s;
return *this;
}
CTime  CTime::operator-=(int s)
{
*this=*this-s;
return *this;
}
//自行编制用于测试的main()函数，有些结果不必依赖display()函数，提倡用单步执行查看结果
int main()
{
CTime t1(10,28,25),t2(10,27,50),t3,t4,t5,t6,t7,t8,t9,t10;
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=="<<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++"<<endl;
t3=t1++;
t3.display();
cout<<endl;
cout<<"++t1"<<endl;
t4=++t1;
t4.display();
cout<<endl;
cout<<"t1--"<<endl;
t5=t1++;
t5.display();
cout<<endl;
cout<<"--t1"<<endl;
t6=++t1;
t6.display();
cout<<endl;
t7=t1+t2;
cout<<"t1+t2=";
t7.display();
cout<<endl;
cout<<"t1-t2=";
t8=t1-t2;
t8.display();
cout<<endl;
cout<<"t1+777=";
t9=t1+777;
t9.display();
cout<<endl;
cout<<"t1-77=";
t10=t1-77;
t10.display();
return 0;
}
/**/