第九周 项目2 Time类中的运算符重载（续）

/*。
*Copyright(c)2014,烟台大学计算机学院
*All right reserved,
*文件名：test.cpp
*作者：liu_feng_zi_
*完成日期：2015年4月29日
*版本号：v1.0
*问题描述：定义对时间对象的自增和自减一目运算符
*输入描述：
*程序输出：
*/
#include <iostream>
using namespace std;
class CTime
{
private:
short int hour;
short int minute;
short int second;
public:
CTime(int h=0,int m=0,int s=0);
void setTime(int h,int m,int s);
bool operator > (CTime &t);
bool operator < (CTime &t);
bool operator >= (CTime &t);
bool operator <= (CTime &t);
bool operator == (CTime &t);
bool operator != (CTime &t);
CTime operator+(CTime &t);
CTime operator-(CTime &t);
CTime operator+(int s);
CTime operator-(int s);
CTime operator+=(CTime &c);
CTime operator-=(CTime &c);
CTime operator+=(int s);
CTime operator-=(int s);
CTime operator++(int );
CTime operator++();
CTime operator--(int);
CTime operator--();
friend istream&operator>>(istream&in,CTime&t);
friend ostream&operator<<(ostream&out,CTime&t);
};
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)
return false;
return true;
}
bool CTime::operator <= (CTime &t)
{
if(*this>t)
return false;
return true;
}
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;
}
CTime CTime::operator+(CTime &t)
{
CTime t1;
t1.hour=hour+t.hour;
t1.minute=minute+t.minute;
t1.second=second+t.second;
if(t1.second>=60)
{
t1.second%=60;
t1.minute++;
}
if(t1.minute>=60)
{
t1.minute%=60;
t1.hour++;
}
if(t1.hour>=24)
t1.hour-=24;
return t1;
}
CTime CTime::operator-(CTime &t)
{
CTime t1;
t1.hour=hour-t.hour;
t1.minute=minute-t.minute;
t1.second=second-t.second;
if(t1.second<0)
{
t1.second+=60;
t1.minute--;
}
if(t1.minute<0)
{
t1.minute+=60;
t1.hour--;
}
if(t1.hour<0)
t1.hour+=24;
return t1;
}
CTime CTime::operator+(int s)
{
CTime t1;
t1.second=second+s;
while(t1.second>=60)
{
t1.second%=60;
t1.minute++;
}
while(t1.minute>=60)
{
t1.minute%=60;
t1.hour++;
}
if(t1.hour>=24)
t1.hour-=24;
return t1;
}
CTime CTime::operator-(int s)
{
CTime t1;
t1.second=second-s;
while(t1.second<0)
{
t1.second+=60;
t1.minute--;
}
while(t1.minute<0)
{
t1.minute+=60;
t1.hour--;
}
if(t1.hour<0)
t1.hour+=24;
return t1;
}
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)
{
*this=*this-s;
return *this;
}
CTime CTime::operator-=(int s)
{
*this=*this-s;
return *this;
}
CTime CTime::operator++(int )
{
CTime temp(*this);
second++;
if(second>=60)
{
second%=60;
minute++;
}
if(minute>=60)
{
minute%=60;
hour++;
}
if(hour>=24)
hour-=24;
return temp;
}
CTime CTime::operator++()
{
second++;
if(second>=60)
{
second%=60;
minute++;
}
if(minute>=60)
{
minute%=60;
hour++;
}
if(hour>=24)
hour-=24;
return *this;
}
CTime CTime::operator--(int)
{
CTime temp(*this);
if(second<0)
{
second+=60;
minute--;
}
if(minute<0)
{
minute+=60;
hour--;
}
if(hour<0)
hour+=24;
return temp;
}
CTime CTime::operator--()
{
if(second<0)
{
second+=60;
minute--;
}
if(minute<0)
{
minute+=60;
hour--;
}
if(hour<0)
hour+=24;
return *this;
}
istream&operator>>(istream&in,CTime&t)
{
in>>t.hour>>t.minute>>t.second;
return in;
}
ostream&operator<<(ostream&out,CTime&t)
{
out<<"("<<t.hour<<","<<t.minute<<","<<t.second<<")"<<endl;
return out;
}
int main()
{
CTime t1(8,20,25),t2(11,20,50),t;
cout<<"t1为："<<t1;
cout<<"t2为："<<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;
t=t1+t2;
cout<<"t1+t2="<<t;
t=t1-t2;
cout<<"t1-t2="<<t;
t=t1+2000;
cout<<"t1+2000="<<t;
t=t1-5000;
cout<<"t1-5000="<<t;
t1+=t2;
cout<<"t1+=t2="<<t1;
t1-=t2;
cout<<"t1-=t2="<<t1;
t1+=2000;
cout<<"t1+=2000="<<t1;
t1-=5000;
cout<<"t1-=5000="<<t1;
t=t1++;
cout<<t;
t=++t1;
cout<<t;
t=++t2;
cout<<t;
t=t2++;
cout<<t;
return 0;
}