Samson_Func_Vat

import java.util.*;
public class Samson_Func_Vat {
    private static final double VAT_RATE = 0.12;
    public static double calculateVatAmount(double price) {
        if (price < 0) {
            System.err.println("Warning: Price cannot be negative. Returning 0.0 for VAT.");
            return 0.0;
        }
        return price * VAT_RATE;
    }
    public static void errorMsg(){
        System.out.println("Error: Invalid Input. Please enter a number.");
    }
    public static void main(String[] args) {
        try (Scanner scan = new Scanner(System.in)) {
            System.out.println("--- Samson VAT Calculator ---");
            System.out.print("Please enter the price: ");
            while (true) {
                try {
                    double price = scan.nextDouble();
                    double vatAmount = calculateVatAmount(price);
                    System.out.printf("The VAT amount for the price of %.2f is: %.2f%n", price, vatAmount);
                    break;
                } catch (InputMismatchException e) {
                    errorMsg();
                    scan.nextLine();
                    System.out.print("Please enter the price: ");
                }
            }
        } catch (Exception e) {
            System.err.println("An unexpected error occurred: " + e.getMessage());
        }
        System.out.println("--- Program finished ---");
    }
}