// CSE 142, Spring 2010, Marty Stepp
// This is an improved version of the "Receipt" program from week 2.
// Now it is more flexible because it uses the Scanner and a cumulative sum.
// This version also uses static methods with parameters and returns.

import java.util.*;  // for Scanner

public class Receipt3 {
    public static final int TAX_PERCENT = 8;
    public static final int TIP_PERCENT = 15;

    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        System.out.print("How many people ate? ");
        int people = console.nextInt();

        double subtotal = readMeals(console, people);
        results(subtotal);
    }
    
    public static double readMeals(Scanner console, int people) {
        // cumulative sum of each person's meal cost
        double subtotal = 0.00;
        for (int i = 1; i <= people; i++) {
            System.out.print("Person #" + i + ": How much did your dinner cost? ");
            double cost = console.nextDouble();
            subtotal = subtotal + cost;
        }
        return subtotal;
    }
    
    public static void results(double subtotal) {
        double tax = TAX_PERCENT / 100.0 * subtotal;
        double tip = TIP_PERCENT / 100.0 * subtotal;
        double total = subtotal + tax + tip;
        System.out.printf("Subtotal = $%6.2f\n", subtotal);
        System.out.printf("Tax %3d%% = $%6.2f\n", TAX_PERCENT, tax);
        System.out.printf("Tip %3d%% = $%6.2f\n", TIP_PERCENT, tip);
        System.out.printf("Total    = $%6.2f\n", total);
    }
}