import java.util.Scanner;

public class TripExpenseProgram {
	public static void main(String[] args) {
		float		food, hotel, gas, entertainment, each, difference;
		Scanner		keyboard = new Scanner(System.in);

		// Get the user input
		System.out.println("Enter food expense total: ");
		food = keyboard.nextFloat();

		System.out.println("Enter hotel bill total: ");
		hotel = keyboard.nextFloat();

		System.out.println("Enter gasoline expense total: ");
		gas = keyboard.nextFloat();

		System.out.println("Enter entertainment expense total: ");
		entertainment = keyboard.nextFloat();

		// Calculate the difference
		each = (food + hotel + gas + entertainment) / 2;
		difference = each  - (gas + entertainment);

		// These four lines are not necessary, but they give a breakdown
		// that will help verify whether or not the result is correct.
		System.out.println("\nThe total expenses are " +
						String.format("$%,1.2f", each * 2));
		System.out.println("Each person should pay " +
						String.format("$%,1.2f", each));

		System.out.println("Steve paid " +
						String.format("$%,1.2f", (gas + entertainment)));
		System.out.println("Bob paid   " +
						String.format("$%,1.2f", (food + hotel)));

		// Decide who owes who and then display the results
		if (difference > 0)
			System.out.print("\nTherefore, Steve owes Bob ");
		else
			System.out.print("\nTherefore, Bob owes Steve ");

		System.out.println(String.format("$%,1.2f", difference));

    }
}