Java please help Method square Area (double side) determines and returns the are

Question

Java please help Method square Area (double side) determines and returns the area of a square Method rectangle Area (double width, double length) determines and returns the area of a rectangle. Method circle Area (double radius) determines and returns the area of a circle. Method triangle Area (double base, double height) determines and returns the area of a triangle. Test the methods with different input value road from the user (in the main method) Design the main method of your program such that it allows the user to re -run the program with different inputs (I,e use a loop structure) Document your code. and organize and space the outputs properly. Use escape characters to organize the outputs Sample output is

Explanation / Answer

import java.util.*;
import java.lang.*;
import java.io.*;

class Area
{
   double squareArea(double side)
   {
       return side*side;
   }
   double rectangleArea(double width,double length)
   {
       return width*length;
   }
   double circleArea(double radius)
   {
       return (3.14*radius*radius);
   }
   double triangleArea(double base,double height)
   {
       return (0.5*base*height);
   }
   public static void main (String[] args) throws IOException
   {
       double a,b;
       Area obj = new Area();
       BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
       System.out.println("Enter 1 for square area, 2 for rectangle area, 3 for circle area , 4 for triangle area and 0 to exit" );
       int ch=Integer.parseInt(br.readLine());
       while(ch!=0)
       {
           if(ch==1)
           {
               System.out.println("Enter the Square Side: ");
               a=Double.parseDouble(br.readLine());
               System.out.println("Square Side = "+a);
               System.out.println("Square Area = "+obj.squareArea(a));
           }
           else if(ch==2)
           {
               System.out.println("Enter the Rectangle Width: ");
               a=Double.parseDouble(br.readLine());
               System.out.println("Enter the Rectangle Length: ");
               b=Double.parseDouble(br.readLine());
               System.out.println("Rectangle Width = "+a);
               System.out.println("Rectangle Length = "+b);
               System.out.println("Rectangle Area= "+obj.rectangleArea(a,b));
           }
           else if(ch==3)
           {
               System.out.println("Enter the Circle Radius: ");
               a=Double.parseDouble(br.readLine());
               System.out.println("Circle Radius= "+a);
               System.out.println("Circle Area= "+obj.circleArea(a));
           }
           else
           {
               System.out.println("Enter the Triangle Base: ");
               a=Double.parseDouble(br.readLine());
               System.out.println("Enter the Triangle Height: ");
               b=Double.parseDouble(br.readLine());
               System.out.println("Triangle Base = "+a);
               System.out.println("Triangle Height= "+b);
               System.out.println("Triangle Area= "+obj.triangleArea(a,b));
           }
           System.out.println("Enter 1 for square area, 2 for rectangle area, 3 for circle area , 4 for triangle area and 0 to exit" );
           ch=Integer.parseInt(br.readLine());
       }
   }
}

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