Question

YOU MUST USE SWITCH STATEMENTS TO SOLVE THE NEXT TWO PROBLEMS.

NO LOOPS ALLOWED we have not covered them yet therefore we can't use them

Write a program that displays the following menu: Geometry Calculator

1. Calculate the Area of a Circle

2. Calculate the Area of a Rectangle

3. Calculate the Area of a Triangle

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 following formula: area = πr2

Use 3.14159 for π and the radius of the circle for r. If the user enters 2, the program should ask for the length and width of the rectangle and then display the rectangle’s area. Use the following formula: area = length * width

If the user enters 3 the program should ask for the length of the triangle’s base and its height, and then display its area. Use the following formula: area = base * height * .5

If the user enters 4, the program should end.

Input Validation: Display an error message if the user enters a number outside the range of 1 through 4 when selecting an item from the menu. Do not accept negative values for the circle’s radius, the rectangle’s length or width, or the triangle’s base or height.

Answer 1

Since you have not mentioned the language of your preference, I am providing the code in Java.

CODE

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

int choice;

double area = 0;

Scanner sc = new Scanner(System.in);

System.out.println("Geometry Calculator\n" +

"1. Calculate the Area of a Circle\n" +

"2. Calculate the Area of a Rectangle\n" +

"3. Calculate the Area of a Triangle\n" +

"4. Quit");

choice = sc.nextInt();

switch(choice) {

case 1:

double radius;

System.out.println("Enter the radius of the circle: ");

radius = sc.nextDouble();

if (radius < 0) {

System.out.println("Invalid radius!!");

break;

}

area = Math.PI * radius * radius;

System.out.println("Area of circe = " + area);

break;

case 2:

double length, width;

System.out.println("Enter the length and width of the rectangle: ");

length = sc.nextDouble();

width = sc.nextDouble();

if (length < 0 || width < 0) {

System.out.println("Invalid length/width !!");

break;

}

area = length * width;

System.out.println("Area of rectangle = " + area);

break;

case 3:

double base, height;

System.out.println("Enter the base height width of the triangle: ");

base = sc.nextDouble();

height = sc.nextDouble();

if (base < 0 || height < 0) {

System.out.println("Invalid base/height !!");

break;

}

area = 0.5 * base * height;

System.out.println("Area of triangle = " + area);

break;

case 4:

System.out.println("Exiting...");

break;

default:

System.out.println("Invalid menu option....");

}

}

}