Assignment 4

import java.util.Scanner;
abstract class Shape{
double dimension1;
double dimension2;
public void inputDimension(double dim1,double dim2){
this.dimension1=dim1;
this.dimension2=dim2;
}
abstract double computeArea();
}
class Triangle extends Shape {
 double computeArea(){
 return 0.5 * dimension1 * dimension2 ;
 }
}
class Rectangle extends Shape{
 double computeArea(){
 return dimension1*dimension2;
 }
}
class Square extends Shape{
 double computeArea(){
 return dimension1*dimension1;
 }
}
public class Ass_4{
public static void main (String []args){
Scanner sc= new Scanner(System.in);
 System.out.println("Enter base of Triangle:");
 double base=sc.nextDouble();
 System.out.println("Enter height of Triangle:");
 double height=sc.nextDouble();
 Shape triangle=new Triangle();
 triangle.inputDimension(base,height);
 System.out.println("Area of Triangle:"+ triangle.computeArea());
 System.out.println("Enter width of Rectangle:");
 double width=sc.nextDouble();
 System.out.println("Enter length of Rectangle:");
 double length=sc.nextDouble();
 Shape rectangle= new Rectangle();
 rectangle.inputDimension(width,length);
 System.out.println("Area of Rectangle:"+ rectangle.computeArea());
 System.out.println("Enter side of square:");
 double side=sc.nextDouble();
 Shape square= new Square();
 square.inputDimension(side,side);
 System.out.println("Area of square:"+ square.computeArea());
 sc.close();
 }
}