?? 友元的使用.cpp
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#include <iostream.h>
#include <math.h>
class Point
{
public:
Point(double xx, double yy)
{
x=xx;
y=yy;
}
void Getxy();
friend double Distance(Point &a, Point &b);
private:
double x;
double y;
};
void Point::Getxy()
{
cout << "(" << x << "," << y << ")" << endl;
}
double Distance(Point &a, Point &b)
{
double dx = a.x - b.x;
double dy = a.y - b.y;
return sqrt(dx * dx + dy * dy);
}
void main()
{
Point p1(3.0, 4.0);
Point p2(6.0, 8.0);
p1.Getxy();
p2.Getxy();
double d = Distance(p1, p2);
cout << "Distance is" << d << endl;
}
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