calculator

import java.util.Scanner;

public class calculator {

    public static void main(String[] args) {
        int choice = 0;
        Scanner scan = new Scanner(System.in);


        while (choice != 5) {

            menu();
            choice = scan.nextInt();

            switch (choice) {
                case 1:
                    add();
                    break;
                case 2:
                    sub();
                    break;
                case 3:
                    mult();
                    break;
                case 4:
                    div();
                    break;
                case 5:
                    quit();
                    break;
                default:
                    System.out.println("Not a valid choice. Please try again");
                    menu();

            }
        }

    }



    public static void menu() {
        System.out.println("What do you want to do?");
        System.out.println("1. Add");
        System.out.println("2. Subtract");
        System.out.println("3. Multiply");
        System.out.println("4. Divide");
        System.out.println("5. Quit");
        System.out.println("Enter your choice:");
    }

    public static void add() {
        Scanner scan = new Scanner(System.in);
        double sum = 0;

        System.out.println("Enter number 1:");
        double a = scan.nextDouble();
        System.out.println("Enter number 2:");
        double b = scan.nextDouble();

        sum = a + b;

        System.out.println("Result: " + sum);
    }

    public static void sub() {
        Scanner scan = new Scanner(System.in);
        double sum = 0;

        System.out.println("Enter number 1:");
        double a = scan.nextDouble();
        System.out.println("Enter number 2:");
        double b = scan.nextDouble();

        sum = a - b;

        System.out.println("Result: " + sum);
    }

    public static void mult() {
        Scanner scan = new Scanner(System.in);
        double sum = 0;

        System.out.println("Enter number 1:");
        double a = scan.nextDouble();
        System.out.println("Enter number 2:");
        double b = scan.nextDouble();

        sum = a * b;

        System.out.println("Result: " + sum);
    }

    public static void div() {
        Scanner scan = new Scanner(System.in);
        double sum = 0;

        System.out.println("Enter number 1:");
        double a = scan.nextDouble();
        System.out.println("Enter number 2:");
        double b = scan.nextDouble();

        sum = a / b;

        System.out.println("Result: " + sum);
    }

    public static void quit() {

    }


}