demo_4_friend_function_2.cpp

对于一个初涉VC＋＋的人来书

//**************************************************************

#include <iostream.h>

class Time
{
public:
	Time(int,int,int);
    friend void display(Time &);
private:
   int hour;
   int minute;
   int sec;
};

Time::Time(int h,int m,int s)
{
	hour=h;
    minute=m;
	sec=s;
}

void display(Time &t)
{
	cout<<t.hour<<":"<<t.minute<<":"<<t.sec<<endl;
	t.hour=20;
	t.minute=23;
	t.sec=26;
	cout<<t.hour<<":"<<t.minute<<":"<<t.sec<<endl;
}
   
int main()
{
	Time t(10,13,16);

	display(t);

	return 0;
}