#include <math.h>
#include <stdio.h>

class Point
{
protected:
double m_xValue;
double m_yValue;

public:
Point(double p_xValue=0, double p_yValue=0)
{
	m_xValue = p_xValue;
	m_yValue = p_yValue;
};

double operator-(const Point& p_Point)
{
	double xDiff;
	double yDiff;

	xDiff = m_xValue - p_Point.m_xValue;
	yDiff = m_yValue - p_Point.m_yValue;

	return sqrt(xDiff*xDiff + yDiff*yDiff);
};

};

main()
{

Point x(1,1);
Point y(4,5);

printf("%g\n",x-y);
}