VendingMachine

package O1Exercise;

import java.util.Scanner;

public class Ex07VendingMachine {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String input = scanner.nextLine();

        double coins, sum = 0, price;

            while (!input.equalsIgnoreCase("start")) {
                coins = Double.parseDouble(input);

                if (coins == 0.1 || coins == 0.2 || coins == 0.5 || coins == 1 || coins == 2) {
                    sum += coins;
                } else {
                    System.out.printf("Cannot accept %.2f%n", coins);

                }
                input = scanner.nextLine();

            }

            input = scanner.nextLine();

        while (!input.equalsIgnoreCase("end")) {
            switch (input) {
                case "Nuts":
                    price = 2.0;
                    if (sum >= price) {
                        System.out.printf("Purchased %s%n", input);
                        sum -= price;
                    } else {
                        System.out.println("Sorry, not enough money");
                    }
                    break;
                case "Water":
                    price = 0.7;
                    if (sum >= price) {
                        System.out.printf("Purchased %s%n", input);
                        sum -= price;
                    } else {
                        System.out.println("Sorry, not enough money");
                    }
                    break;
                case "Crisps":
                    price = 1.5;
                    if (sum >= price) {
                        System.out.printf("Purchased %s%n", input);
                        sum -= price;
                    } else {
                        System.out.println("Sorry, not enough money");
                    }
                    break;
                case "Soda":
                    price = 0.8;
                    if (sum >= price) {
                        System.out.printf("Purchased %s%n", input);
                        sum -= price;
                    } else {
                        System.out.println("Sorry, not enough money");
                    }
                    break;
                case "Coke":
                    price = 1;
                    if (sum >= price) {
                        System.out.printf("Purchased %s%n", input);
                        sum -= price;
                    } else {
                        System.out.println("Sorry, not enough money");
                    }
                    break;
                default:
                    System.out.println("Invalid product");
                    break;
            }

            input = scanner.nextLine();
        }
        System.out.printf("Change: %.2f", sum);

    }
}