xt9-10.cpp

谭浩强C程序设计习题答案

#include <iostream>
using namespace std;
class Date;
class Time
 {public:
   Time(int,int,int);
   friend void display(const Date &,const Time &);
  private:
   int hour;
   int minute;
   int sec;
 };
 
 Time::Time(int h,int m,int s)
 {hour=h;
  minute=m;
  sec=s;
 }
 
class Date
 {public:
   Date(int,int,int);
   friend void display(const Date &,const Time &);
  private:
   int month;
   int day;
   int year;
 };
 
Date::Date(int m,int d,int y)
 {month=m;
  day=d;
  year=y;
 }
 
void display(const Date &d,const Time &t)
 {
  cout<<d.month<<"/"<<d.day<<"/"<<d.year<<endl;
  cout<<t.hour<<":"<<t.minute<<":"<<t.sec<<endl;
 }
 
   
int main()
{
 Time t1(10,13,56);
 Date d1(12,25,2004);
 display(d1,t1);
 return 0;
}