//This program uses inheritance to extend Box.
class Box1 {
	double width;
	double height;
	double depth;

	// construct clone of an object
	Box1(Box1 ob) { // pass object to constructor
		width = ob.width;
		height = ob.height;
		depth = ob.depth;
	}

	// constructor used when all dimensions specified
	Box1(double w, double h, double d) {
		width = w;
		height = h;
		depth = d;
	}

	// constructor used when no dimensions specified
	Box1() {
		width = -1; // use -1 to indicate
		height = -1; // an uninitialized
		depth = -1; // box
	}

	// constructor used when cube is created
	Box1(double len) {
		width = height = depth = len;
	}
	// compute and return volume
	double volume() {
		return width * height * depth;
	}
}

//Here, Box is extended to include weight.
class BoxWeight1 extends Box1 {
	double weight; // weight of box

	// constructor for BoxWeight
	BoxWeight1(double w, double h, double d, double m) {
		width = w;
		height = h;
		depth = d;
		weight = m;
	}
}

class DemoBoxWeight {
	public static void main(String args[]) {
		BoxWeight1 mybox1 = new BoxWeight1(10, 20, 15, 34.3);
		BoxWeight1 mybox2 = new BoxWeight1(2, 3, 4, 0.076);
		double vol;
		
		vol = mybox1.volume();
		System.out.println("Volume of mybox1 is " + vol);
		System.out.println("Weight of mybox1 is " + mybox1.weight);
		System.out.println();
		
		vol = mybox2.volume();
		System.out.println("Volume of mybox2 is " + vol);
		System.out.println("Weight of mybox2 is " + mybox2.weight);
	}
}