// 2D point - without const and reference args
//
#include <iostream>
#include <cmath>
using namespace std;

class Point
{
 private: double x, y;

 public: Point(double xx, double yy) { x = xx; y = yy; }

  void print(const char msg[])
  { 
    cout << msg << ": (" << x << "," << y << ")" << endl;
  }

  static double distance( Point p, Point q)
  {
    double dx = p.x - q.x, dy = p.y - q.y;

    return sqrt(dx*dx+dy*dy);
  }

};
// 2D point example
//
#include <iostream>
// #include "Point.h"
using namespace std;

int main()
{
  Point p(1,2); p.print("p");

  Point q(3,4); q.print("q");

  cout << "distance = " << Point::distance(p,q) << endl;
}