pointers and classes

[source lang= "cpp"]
//use of pointers with multiple objects
#include <iostream>

using namespace std;

class Rectangle
{
	private:
	int x, y;
	
	public:
	Rectangle();
	void set_values(int, int);	// must use arguments to set private data
	int area();
};

Rectangle::Rectangle()	//Constructor will initialize x and y when object rect is created
{						//That way if rect.area() is called before x and y are set, they will
	x = 0;				//be initialized.
	y = 0;
}

void Rectangle::set_values(int a, int b)
{
	x = a;
	y = b;
}

int Rectangle::area()
{
	return(x*y);
}

int main()
{
	Rectangle rectA;
	rectA.set_values(2, 10);
	cout << "rectA Area = " << rectA.area() << endl;
	
	Rectangle *rectB;
	rectB = new Rectangle;	//must create a new Rectangle object
	rectB->set_values(3, 10);
	cout << "*rectB Area = " << rectB->area() << endl;
	delete rectB;	//must delete object rectB when done
		
	return 0;
}