Question

Write a program in Java that can calculate and output the area of three different shapes; a rectangle, a triangle and a circle. Let the user choose which shape they want by typing the words “rectangle”, “triangle” or “circle” (you may use integers, strings or chars to indicate which shape the user prefers to calculate the area of). Then, have the user enter the values of the dimension(s) appropriate for each shape in the form of doubles.

Answer 1

Test.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Test {
   public static void main(String[] args)throws IOException {
       //for taking console input
       BufferedReader br = new BufferedReader(new InputStreamReader (System.in));
       String shape;
       double area, l, h, b, r;
       System.out.print("Enter the shape: ");
       shape = br.readLine();//getting shape
       shape = shape.toLowerCase();
       switch(shape) {//using swwitch case for determining correct shape
       case "triangle":
           System.out.println("Enter Dimensions");
           System.out.print("Base: ");
           b = Double.parseDouble(br.readLine());
           System.out.print("Height: ");
           h = Double.parseDouble(br.readLine());
           area = (h*b)/2.0;//triangle area formula
           System.out.printf("Area of the Triangle is %.2f",area);
           break;
       case "rectangle":
           System.out.println("Enter Dimensions");
           System.out.print("Length: ");
           l = Double.parseDouble(br.readLine());
           System.out.print("Breadth: ");
           b = Double.parseDouble(br.readLine());
           area = l*b;//rectangle area formula
           System.out.printf("Area of the Rectangle is %.2f",area);
           break;
       case "circle":
           System.out.println("Enter Dimensions");
           System.out.print("Radius: ");
           r = Double.parseDouble(br.readLine());
           area = 3.14*r*r;//circle area formula
           System.out.printf("Area of the Circle is %.2f",area);
           break;
       default:
           System.out.println("Wrong Choice! Try Again");
           break;
       }
   }
}

Program Screenshot

Output