Slip No 3 Q B

Q.Define an abstract class Shape with abstract methods area () and volume (). Derive abstract class Shape into two classes Cone and Cylinder. Write a java Program to calculate area and volume of Cone and Cylinder.(Use Super Keyword.) [25 M]

import java.util.Scanner;

// Abstract class Shape
abstract class Shape {
    double r, h;

    // Constructor using super concept
    Shape(double r, double h) {
        this.r = r;
        this.h = h;
    }

    abstract double area();
    abstract double volume();
}

// Cone class
class Cone extends Shape {

    Cone(double r, double h) {
        super(r, h);   // calling parent constructor
    }

    double area() {
        double l = Math.sqrt(r*r + h*h);   // slant height
        return Math.PI * r * (r + l);
    }

    double volume() {
        return (Math.PI * r * r * h) / 3;
    }
}

// Cylinder class
class Cylinder extends Shape {

    Cylinder(double r, double h) {
        super(r, h);   // calling parent constructor
    }

    double area() {
        return 2 * Math.PI * r * (r + h);
    }

    double volume() {
        return Math.PI * r * r * h;
    }
}

// Main class
public class ShapeDemo {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter radius and height for Cone: ");
        double r1 = sc.nextDouble();
        double h1 = sc.nextDouble();

        System.out.print("Enter radius and height for Cylinder: ");
        double r2 = sc.nextDouble();
        double h2 = sc.nextDouble();

        Cone c1 = new Cone(r1, h1);
        Cylinder c2 = new Cylinder(r2, h2);

        System.out.println("\nCone Area = " + c1.area());
        System.out.println("Cone Volume = " + c1.volume());

        System.out.println("\nCylinder Area = " + c2.area());
        System.out.println("Cylinder Volume = " + c2.volume());

        sc.close();
    }
}