C++高手请进,谢谢急用

#include<iostream.h>
#include<stdlib.h>
class Time
{ private:

int minute;
protected:
int second;
public:
int hour;
Time(int h,int m,int s):hour(h),minute(m),second(s){}
void display();
};
class Time1: public Time
{ private:
int year,month,day;
public:
Time1(int h,int m,int s,int y,int mon,int d):Time(h,m,s),year(y),month(mon),day(d){}
void display1();
};
void Time::display()
{cout<<hour<<'/'<<minute<<'/'<<second<<endl;
}
void Time1::display1()
{ cout<<year<<'/'<<month<<'/'<<day<<'/';
display();

}
int main()
{Time t1(0,0,0);
t1.display();
Time1 t2(1,1,1,2,2,2);
t2.display1();
cout<<t2.hour ;
system("pause");
return 0;
}
这个程序的倒数第四行"cout&l

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