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Menu Driven Program - Overload Method - Java Programs

Write a menu-driven program using switch case to accept a choice from the user and according to the choice entered perform the following operations:

(a) To calculate and display the area of a circle using the formula:
Area = (π × radius2) where π = 22 / 7

(b) To calculate and display the area of a rectangle using the formula:
Area = (length × breadth)

(c) To calculate and display the area of a triangle using the formula:
Area = 1 / 2 × base × height

(d) To calculate and display the area of a square using the formula:
Area = side2

For an incorrect option, an appropriate error message should be displayed.

Java 

import java.util.Scanner;
class Menu{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        System.out.println("1. Area of circle");
        System.out.println("2. Area of rectangle");
        System.out.println("3. Area of triangle");
        System.out.println("4. Area of square");
        System.out.print("Enter your choice: ");
        int choice = Integer.parseInt(in.nextLine());
        switch(choice){
        case 1:
            System.out.print("Radius = ");
            double r = Double.parseDouble(in.nextLine());
            double a = 22.0 / 7 * r * r;
            System.out.println("Area = " + a);
            break;
        case 2:
            System.out.print("Length = ");
            double l = Double.parseDouble(in.nextLine());
            System.out.print("Breadth = ");
            double b = Double.parseDouble(in.nextLine());
            a = l * b;
            System.out.println("Area = " + a);
            break;
        case 3:
            System.out.print("Base = ");
            b = Double.parseDouble(in.nextLine());
            System.out.print("Height = ");
            double h = Double.parseDouble(in.nextLine());
            a = 1.0 / 2 * b * h;
            System.out.println("Area = " + a);
            break;
        case 4:
            System.out.print("Side = ");
            double s = Double.parseDouble(in.nextLine());
            a = s * s;
            System.out.println("Area = " + a);
            break;
        default:
            System.out.println("Invalid choice!");
        }
    }
}

Output

 
 OUTPUT 1: 
1. Area of circle
2. Area of rectangle
3. Area of triangle
4. Area of square
Enter your choice: 1
Radius = 10
Area = 314.2857142857143

 OUTPUT 2: 
1. Area of circle
2. Area of rectangle
3. Area of triangle
4. Area of square
Enter your choice: 2
Length = 10
Breadth = 20
Area = 200.0
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