// Marty Stepp, CSE 142, Autumn 2008
// This program demonstrates a cumulative sum.
// It is an enhanced version of the Receipt program we wrote in our 
// ch02-1 lecture about expressions and variables.
// This version of the program prompts for the number of people who ate and
// for each person's meal price, and computes the overall
// meal cost.
//
// Example output:
/*
How many people ate? 4
Person #1: How much did your dinner cost? 20
Person #2: How much did your dinner cost? 15
Person #3: How much did your dinner cost? 25
Person #4: How much did your dinner cost? 10
Subtotal: $70.00
Tax: $5.60
Tip: $10.50
Total: $86.10
*/

import java.util.*;

public class Receipt2 {
	public static void main(String[] args) {
		Scanner console = new Scanner(System.in);
		
		System.out.print("How many people ate? ");
		int people = console.nextInt();
		
		// "cumulative sum" : increases incrementally inside the loop
		double subtotal = 0.0;

		for (int i = 1; i <= people; i++) {
			System.out.print("Person #" + i + ": How much did your dinner cost? ");
			double personCost = console.nextDouble();
			subtotal = subtotal + personCost;  // add to sum
		}
		
		results(subtotal);
	}
		
	// Calculates total owed, assuming 8% tax and 15% tip
	public static void results(double subtotal) {
		double tax = subtotal * .08;
		double tip = subtotal * .15;
		double total = subtotal + tax + tip;
		
		System.out.printf("Subtotal: $%.2f\n", subtotal);
		System.out.printf("Tax: $%.2f\n", tax);
		System.out.printf("Tip: $%.2f\n", tip);
		System.out.printf("Total: $%.2f\n", total);
	}
}