// e31.cpp
// Building classes
// Point class

#include <iostream>
using namespace std;

class Point{				// Delaration Point Class
	int x,y;					// Properties: x ve y coordinates
 public:
	void move(int, int);	// A function to move points
	void print();			// to prints cordinates on the screen
	bool is_zero();		// is point on the zero point(0,0)
};

// ***** Bodies of Member Functions *****

// A function to move the points 
void Point::move(int new_x, int new_y)
{
	x = new_x;				// assigns new value to x coordinat
	y = new_y;				// assigns new value to y coordinat 
}

// To print the coordinates on the screen 
void Point::print()
{
	cout << "X= " << x << ", Y= " << y << endl;
}
				
// is the point on the zero point(0,0)
bool Point::is_zero()
{
	return (x == 0) && (y == 0);	  
}

int main()
{
	Point point1,point2;			// 2 object are defined: point1 and point2
	point1.move(100,50);			// point1 moves to (100,50)
	point1.print();				// point1's coordinates to the screen
	point1.move(20,65);			// point1 moves to (20,65)
	point1.print();				// point1's coordinates to the screen
	if(point1.is_zero())			// is point1 on (0,0)?
		cout << "point1 is now on zero point(0,0)" << endl;
	else
		cout << "point1 is NOT on zero point(0,0)" << endl;
	point2.move(0,0);				// point2 moves to (0,0)
	if(point2.is_zero())			// is point2 on (0,0)?
		cout << "point2 is now on zero point(0,0)" << endl;
	else
		cout << "point2 is NOT on zero point(0,0)" << endl;
	return 0;
}