第九周实验报告（二）

#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();
//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 w);//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 w);//返回s秒前的时间
friend istream & operator >>(istream & ,CTime &);
friend ostream & operator <<(ostream &,CTime &);
};
//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

int main()
{
CTime t1,t2,t;
cout<<"请输入t1"<<endl;
cin >> t1;
cout<<"请输入t2"<<endl;
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<<"t1与t2的和为";
t = t1 + t2;
cout<<t;

cout<<"差"<<endl;
t = t1 - t2;
cout<<t;

cout<<"在t1的基础上加2s";
t = t1 + 2;
cout<<t;

cout<<"在t1的基础上减2s";
t = t1 - 2;
cout<<t;

cout<<"t1前置加1s";
++t1;
cout<<t;

cout<<"t1后置加1s";
t1++;
cout<<t;

cout<<"t1前置减1s";
--t1;
cout<<t;

cout<<"t1后置减1s";
t1--;
cout<<t;

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

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

cout<<"t1+=2     ";
t1+=2;
cout<<t;

cout<<"t1-=2     ";
t1-=2;
cout<<t;

cout<<endl;
system("pause");
return 0;
//下面自行设计对其他运算符的重载的测试

}
/*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;
}
else
return false;
}
bool CTime::operator<(CTime &t)
{
if(hour<t.hour)
{
return true;
}
else
return false;
}
bool CTime::operator ==(CTime &t)
{
if(hour==t.hour&&minute==t.minute&&second==t.second)
return true;
else
return false;
}
bool CTime::operator >=(CTime &t)
{
if(hour==t.hour&&minute==t.minute&&second==t.second)
return true;
else
return false;
}
bool CTime::operator <=(CTime &t)
{
if(hour==t.hour&&minute==t.minute&&second==t.second)
return true;
else
return false;
}
bool CTime::operator !=(CTime &t)
{
if(hour!=t.hour||minute!=t.minute||second!=t.second)
return true;
else
return false;
}
CTime CTime::operator+(CTime &c)
{
CTime a;
a.hour = hour + c.hour;

if(a.hour>24)
a.hour -= 24;

a.minute = minute + c.minute;

if(a.minute>=60)
{
a.minute -= 60;
a.hour+=1;
}
a.second = second + c.second;
if(a.second>=60)
{
a.second -= 60;
a.minute+=1;
if(a.minute>=60)
{
a.minute -= 60;
a.hour+=1;
}
}
return a;
}
CTime CTime::operator -(CTime &c)
{
int h,m,s;

h = hour - c.hour;
m = minute - c.minute;
s = second - c.second;
if(s<0)
{
s=(-s);
m--;
}
if(m<0)
{
m=60+m;
h--;
}
while (h<0) h=-h;
CTime a(h,m,s);
return a;

}
CTime CTime::operator+(int s)
{
CTime a;
a.second = second + s;
if(a.second>=60)
{
a.second -= 60;
a.minute=minute+1;
}
else
a.minute = minute;
if(a.minute>=60)
{
a.minute -= 60;
a.hour=hour+1;
}
else
a.hour = hour;
return a;
}
CTime CTime::operator-(int w)
{
int h,m,s;
h = hour ;
m = minute ;
s = second - w;
if(s<0)
{
s=(-s);
m--;
}
if(m<0)
{
m=60+m;
h--;
}
if(h<0)
{
h=(-h);
}
CTime a(h,m,s);
return a;
}
CTime CTime::operator++(int)//后置++，下一秒   从这里开始以后使用重载过的运算符，使程序更为简单
{
CTime t=*this;          //*this指的是指向CTime类的成员对象，因为定义的重载的运算符需要一个是类才自动使用
*this=*this+1;          //这里定义了t=*this是因为需要后置一下秒，所以返回的是原来的类的对象成员，并且在原来的基础上*this+1s
return t;
}

CTime CTime::operator++()//前置++，下一秒
{
*this=*this+1;         //这里没有定义CTime t是因为前置返回的是变化后的类的对象成员
return *this;
}

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

CTime CTime::operator--()//前置--，前一秒
{
*this=*this-1;
return *this;
}
CTime CTime::operator+=(CTime &c)
{
*this=*this+c;
return *this;
}
CTime CTime::operator-=(CTime &c)
{
*this=*this-c;
return *this;
}
CTime CTime::operator+=(int s)//返回s秒后的时间
{
*this=*this+s;
return *this;
}
CTime CTime::operator-=(int s)//返回s秒前的时间
{
*this=*this-s;
return *this;
}
ostream & operator <<(ostream & output,CTime &t)
{
output << t.hour << ":"<<t.minute<<":"<<t.second<<endl;;
return output;
}
istream & operator >>(istream & input,CTime &t)
{
input >> t.hour>>t.minute>>t.second;
return input;
}