#ifndef POINT_H
#define POINT_H
#include <cmath>      //for the function sqrt
using namespace std;

class point {
	double x;
	double y;
public:
	//Declaration for a non-inline constructor.
	point(double initial_x, double initial_y);

	//Declaration and definition for an inline constructor.
	point(): x {0.0}, y {0.0} {}
	
	//Declaration for a non-inline member function.
	void print() const;

	//Declaration and definition for an inline member function.
	double r() const {return sqrt(x*x + y*y);}

	//Declaration for a non-inline friend function.
	friend double distance(const point& A, const point& B);

	//Declaration and definition for an inline friend function.
	friend bool equals(const point& A, const point& B) {
		return A.x == B.x && A.y == B.y;
	}
};

#endif