Question

Java only please

6. Write a program that displays the following menu:

Geometry Calculator

1.       Calculate the Area of a Circle

2.       Calculate the Area of a Triangle

3.     Calculate the Area of a Rectangle

4.       Quit

Enter your choice (1-4):

If the user enters 1, the program should ask for the radius of the circle and then display its area. Use the formula:      area = ∏r²    Use 3.14159 for ∏.

If the user enters 2 the program should ask for the length of the triangle’s base and its height, and then display its area. Use the formula:      area = base * height * .5

If the user enters 3, the program should ask for the length and width of the rectangle of the rectangle and then display the rectangle’s area. Use the formula:   area = length * width. Also display a message if the figure is a square.

If the user enters 4, the program should end.

Answer 1

import java.util.Scanner;

public class GeometryCalculator {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        double radius, length, width, base, height;
        while (true) {
            System.out.print("" +
                    "    Geometry Calculator\n" +
                    "        1.  Calculate the Area of a Circle\n" +
                    "        2.  Calculate the Area of a Triangle\n" +
                    "        3.  Calculate the Area of a Rectangle\n" +
                    "        4.  Quit\n" +
                    "Enter your choice (1-4): ");
            int choice = in.nextInt();
            switch (choice) {
                case 1:
                    System.out.print("Enter radius of circle: ");
                    radius = in.nextDouble();
                    System.out.println("Area of circle is " + (Math.PI * radius * radius));
                    break;
                case 2:
                    System.out.print("Enter base of triangle: ");
                    base = in.nextDouble();
                    System.out.print("Enter height of triangle: ");
                    height = in.nextDouble();
                    System.out.println("Area of triangle is " + (0.5 * base * height));
                    break;
                case 3:
                    System.out.print("Enter length of rectangle: ");
                    length = in.nextDouble();
                    System.out.print("Enter width of rectangle: ");
                    width = in.nextDouble();
                    System.out.println("Area of rectangle is " + (length * width));
                    break;
                case 4:
                    return;
                default:
                    System.out.println("Invalid choice. Try again!");
                    break;
            }
            System.out.println();
        }
    }
}