// CSE 142, Autumn 2009, Marty Stepp
// This program uses variables to compute the bill at a restaurant.
// This third version uses good methods for structure
// and also uses System.out.printf to format the numbers.

import java.util.*;

public class Receipt3 {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        double subtotal = meals(console);
        calculateTotal(subtotal);
    }
    
    // Reads the data for the people's meals and returns
    // the subtotal for all meals.
    public static double meals(Scanner console) {
        System.out.print("How many people ate? ");
        int howMany = console.nextInt();
        double subtotal = 0.0;
 
         // read each meal's cost and add them using a cumulative sum
        for (int i = 1; i <= howMany; i++) {
            System.out.print("Person #" + i + 
                             ": How much did your dinner cost? ");
            double cost = console.nextDouble();
            subtotal = subtotal + cost;   // subtotal += cost;
        }
        return subtotal;
    }
     
    // Calculate/print total owed, assuming 8% tax / 15% tip
    public static void calculateTotal(double subtotal) {   
        double tax = subtotal * .08;
        double tip = subtotal * .15;
        double total = subtotal + tax + tip;
        
        // print the various cash amounts in a proper format
        System.out.printf("Subtotal: $%6.2f\n", subtotal);
        System.out.printf("Tax:      $%6.2f\n", tax);
        System.out.printf("Tip:      $%6.2f\n", tip);
        System.out.printf("Total:    $%6.2f\n", total);
    }
}