package CIS115;
import java.util.Scanner;

public class ForDoWhile {

    public static void main(String[] args) {
        // 
        String password = "*****";
        String user;
        do {
            user = promptString("password?");
        } while (!user.equals(password)); // note semicolon for java syntax
        System.out.println("welcome user!");

        
        // do while always uses same prompt
        double income;
        do {
            income = promptDouble("income?");
        } while (income < 0);
        System.out.println("correct income: $" + income);

        
        // first prompt polite
        income = promptDouble("What is your income?");
        while (income < 0) {
            // later, scold user
            System.out.println("No negative income!");
            income = promptDouble("Try again!  Income?");
        }

        // count to 10
        for (int count = 0; count < 10; count = count + 1) {
            System.out.println("#" + count);
        }

        // read a coupon, repeat if there are more
        double bill = 59.99;
        boolean more;
        do {
            double coupon = promptDouble("how much is your coupon?");
            bill = bill - coupon;
            more = promptBoolean("Do you have more?");
        } while (more);
        System.out.println("Your bill is now $" + bill);

        
        // count down
        System.out.println("Countdown:");
        for (int count = 10; count > 10; count = count - 1) {
            System.out.println("#" + count);
        }

        // sum 25 to 75
        int sum = 0;
        for (int i = 25; i <= 75; i = i + 1) {
            sum = sum + i;
        }
        System.out.println("total sum is " + sum);

    }

    /*    Simple Utility methods that prompt the user and return input
          If you enter the wrong type of input, the program will end
          with an error!
     */


    // utility for reading in double input
    public static double promptDouble(String promptText) {
        System.out.print(promptText + " ");
        Scanner scan = new Scanner(System.in);
        double response = scan.nextDouble();
        return response;
    }

    // utility for reading in String input
    public static String promptString(String promptText) {
        System.out.print(promptText + " ");
        Scanner scan = new Scanner(System.in);
        String response = scan.nextLine();
        return response;
    }

    // utility for reading in boolean input
    public static boolean promptBoolean(String promptText) {
        System.out.print(promptText + " (y/n) ");
        Scanner scan = new Scanner(System.in);
        String response = scan.nextLine();
        return response.equalsIgnoreCase("y");
    }
}