PaintCost.java

import java.util.Scanner;

public class PaintCost {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        int choice;
        double gallons = 0;

        do {

            System.out.print("Do you want red or green paint? Please type 1 for red or 2 for " +
                    "green: ");
            int paint = input.nextInt();

            while (paint != 1 && paint != 2) {
                System.out.println("Do you want red or green paint? Please type 1 for red or 2 for green");
                paint = input.nextInt();
            }

            System.out.println("How many full gallons do you need?");
            gallons += input.nextDouble();

            System.out.println("Do you want to make another purchase? 1. for yes 2. for no");
            choice = input.nextInt();

        } while (choice == 1 ); //repeats until user wants to stop making purchases

        titleName();

        double redCost = redCalc(gallons);
        double greenCost = greenCalc(gallons);


        System.out.println("The cost of the red paint is $" + redCost);
        System.out.println("The cost of the green paint is $" + greenCost);

        double totalCost = getTotalCost(redCost,greenCost);

        System.out.printf("You're total cost is $%,.2f\n.",totalCost);
        thankyouMessage();

    }

    public static double redCalc(double gallons) {
        return gallons * 21.95;
    }

    public static double greenCalc(double gallons) {
        return (gallons * 19.95);
    }

    public static double getTotalCost(double a, double b) {
        return (0.08 * (a+b)) + (a+b);
    }

    public static void titleName() {
        System.out.println("The Rainbow Paint Store");
    }

    public static void thankyouMessage() {
        System.out.println("Thank you for purchasing! Please come again!");
    }

}