3.11

#include <iostream>using namespace std;class Time;class Date{public:Date(int ,int ,int);friend Time;private:int day;int month;int year;};Date::Date(int d,int m,int y){ int day=d; int month=m; int year=y;}class Time{public:Time(int,int,int);void display(const Date &);private:int hour;int minute;int sec;};Time::Time(int h,int m,int s){ hour=h; minute=m; sec=s;}void Time::display(const Date &d){ cout<<d.day<<" "<<d.month<<" "<<d.year<<endl; cout<<hour<<" "<<minute<<" "<<sec<<endl;}int main(){ Time t(10,13,56); Date d(12,25,2004); t.display(d); return 0;}