#include
#include
using namespace std;
class Point //Point類定義
{
public://外部接口
Point(int xx=0,int yy=0) {X=xx;Y=yy;}
int GetX() {return X;}
int GetY() {return Y;}
friend float fDist(Point &a,Point &b); //友元函數(shù)聲明
private://私有數(shù)據(jù)成員
int X,Y;
};
float fDist(Point &p1,Point &p2) //友元函數(shù)實現(xiàn)
{ double x=double(p1.X-p2.X); //通過對象訪問私有數(shù)據(jù)成員
double y=double(p1.Y-p2.Y);
return float(sqrt(x*x+y*y));
}
void main() //主函數(shù)
{
Point myp1(1,1),myp2(4,5); //定義Point類的對象
cout