#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){hour=h;minute=m;second=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: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
CTime operator++(int);
CTime operator++();
CTime operator--(int);
CTime operator--();
//重载<<和>>
friend ostream&operator<<(ostream&,CTime&);
friend istream&operator>>(istream&,CTime&);
};
ostream &operator<<(ostream& output,CTime& c)
{
output<<c.hour<<":"<<c.minute<<":"<<c.second<<endl;
return output;
}
istream &operator>>(istream &in,CTime &t)
{
char ch1,ch2;
while(1)
{
cout<<"请输入时间(hh:mm:ss) ";
cin>>t.hour>>ch1>>t.minute>>ch2>>t.second;
if (ch1==':' && ch2==':')
if (t.hour>-1 && t.hour<24 && t.minute>-1 && t.minute<60 && t.second>-1 && t.second<60) break;
cout<<"时间格式不正确! 请重新输入\n";
}
return in;
}
//下面实现所有的运算符重载代码。
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;
if(second<t.second) return false;
return false;
}
bool CTime :: operator < (CTime &t)
{
if(hour>t.hour) return false;
if(hour<t.hour) return true;
if(minute>t.minute) return false;
if(minute<t.minute) return true;
if(second>t.second) 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;
if(second<=t.second) return false;
return false;
}
bool CTime :: operator <= (CTime &t)
{
if(hour>=t.hour) return false;
if(hour<=t.hour) return true;
if(minute>=t.minute) return false;
if(minute<=t.minute) return true;
if(second>=t.second) 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;
if(second!=t.second) return false;
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;
if(second==t.second) return false;
return false;
}
CTime CTime :: operator+(CTime &t)
{
int h,m,s;
s=t.second+second;
m=t.minute+minute;
h=t.hour+hour;
if(s>59)
{
m=m+1;
s=s-60;
}
if(m>59)
{
h=h+1;
m=m-60;
}
if(h>23)
{
h=h-24;
}
CTime c(h,m,s);
return c;
}
CTime CTime :: operator-(CTime &t)
{
int h,m,s;
s=t.second-second;
m=t.minute-minute;
h=t.hour-hour;
if(s<0)
{
m=m-1;
s=s+60;
}
if(m<0)
{
h=h-1;
m=m+60;
}
if(h<0)
{
h=h+24;
}
CTime c(h,m,s);
return c;
}
CTime CTime :: operator+(int s)
{
int h,m,e;
e=second+s+hour*60*60+minute*60;
h=(e/60)/60;
m=(e/60)%60;
e=e%60;
CTime c(h,m,e);
return c;
}
CTime CTime :: operator-(int s)
{
int h,m,e;
e=second+hour*60*60+minute*60;
e=e-s;
h=(e/60)/60;
m=(e/60)%60;
e=e%60;
CTime c(h,m,e);
return c;
}
CTime CTime :: operator+=(CTime &t)
{
int h,m,s;
s=t.second+second;
m=t.minute+minute;
h=t.hour+hour;
if(s>59)
{
m=m+1;
s=s-60;
}
if(m>59)
{
h=h+1;
m=m-60;
}
if(h>23)
{
h=h-24;
}
CTime c(h,m,s);
return c;
}
CTime CTime :: operator-=(CTime &t)
{
int h,m,s;
s=t.second-second;
m=t.minute-minute;
h=t.hour-hour;
if(s<0)
{
m=m-1;
s=s+60;
}
if(m<0)
{
h=h-1;
m=m+60;
}
if(h<0)
{
h=h+24;
}
CTime c(h,m,s);
return c;
}
CTime CTime :: operator+=(int s)
{
int h,m,e;
e=second+s+hour*60*60+minute*60;
h=(e/60)/60;
m=(e/60)%60;
e=e%60;
CTime c(h,m,e);
return c;
}
CTime CTime :: operator-=(int s)
{
int h,m,e;
e=second+hour*60*60+minute*60;
e=e-s;
h=(e/60)/60;
m=(e/60)%60;
e=e%60;
CTime c(h,m,e);
return c;
}
CTime CTime :: operator++()//前置
{
if(++second>=60)
{
second=second-60;
minute++;
}
return *this;
}
CTime CTime :: operator++(int )//后置
{
CTime temp(*this);
second++;
if(second>=60)
{
second=second-60;
minute++;
}
return temp;
}
CTime CTime :: operator--()//前置
{
if(--second<0)
{
second=second+60;
minute--;
}
return *this;
}
CTime CTime :: operator--(int )//后置
{
CTime temp(*this);
second--;
if(second<0)
{
second=second+60;
minute--;
}
return temp;
}
//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(12,20,25),t2(11,20,50),t3,t4,t5,t6;
cout<<t1<<endl;
cout<<t2<<endl;;
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;
t3=t1+t2;
cout<<"t1+t2=";
cout<<t3<<endl;
cout<<endl;
cout<<"t1-t2=";
t4=t1-t2;
cout<<t4<<endl;
cout<<endl;
cout<<"t1+200=";
t5=t1+200;
cout<<t5<<endl;
cout<<"请输入一个时间"<<endl;
cin>>t6;
cout<<t6;
return 0;
}
运行结果
