OJ——输出日期时间--友元类

#include <iostream>

using namespace std;
class Date;
class Time
{
private:
int hour;
int minute;
int second;
public:
Time (int h,int m,int s):hour(h),minute(m),second(s){}
void display(const Date &);
};
class Date
{
private:
int year;
int month;
int day;
public:
Date (int y,int m,int d):year(y),month(m),day(d){}
friend class Time;
};

void Time::display( const Date &d)
{
cout<<d.year<<"/"<<d.month<<"/"<<d.day<<endl;
cout<<hour<<":"<<minute<<":"<<second<<endl;
}
int main()

{

int year,month,day;

cin>>year>>month>>day;

Date d1(year,month,day);

int hour,minute,second;

cin>>hour>>minute>>second;

Time t1(hour,minute,second);

t1.display(d1);

return 0;

}