#include <iostream>
//#include <cmath>
//#include <ctime>

using namespace std;

class Point
{
private:
    double m_x;
    double m_y;

public:

    // Default constructor
    // Here we use initializer list ( after colon )
    // instead of assignment in function body
    Point() :
        m_x(rand()*1.0 / RAND_MAX  * 100),
        m_y(rand()*1.0 / RAND_MAX  * 100)
    {

    }

    // And here too
    // Note that, parameters passed by const reference,
    // not by value
    Point(const double& x, const double& y) :
        m_x(x),
        m_y(y)
    {

    }

    // Accessors:
    // "Getters" are constant functions, they must not change class members
    double GetX() const { return m_x; }
    double GetY() const { return m_y; }

    // "Setters", parameters passed by const reference
    void SetX(const double& x) { m_x = x; }
    void SetY(const double& y) { m_y = y; }

    double distanceTo(const Point& p)
    {
        // Deleted temp variables
        // m_x and m_y changed to appropriate "getter"
        return sqrt( pow( GetX() - p.GetX() , 2 ) + pow( GetY() - p.GetY() , 2) );
    }
};


// Probably free function is more convenient here
double Distance(const Point& a, const Point& b)
{
    return sqrt( pow( a.GetX() - b.GetX() , 2 ) + pow( a.GetY() - b.GetY() , 2) );
}



void main()
{
    Point a(1.2, 0.5);
    Point b;
    b.SetX(2.71);
    b.SetY(3.141592);

    cout << "Distance from (" << a.GetX() << ", " << a.GetY() << ") " ;
    cout << "to (" << b.GetX() << ", " << b.GetY() << ") " ;
    cout << "is " << Distance(a, b) << endl;

    system ("Pause");
}