import java.util.Scanner;
public class GuessingGame {

    public static void main(String[] args) {
        int card1;
        int card2;
        boolean start = true;
        char higherLower;

        Scanner scan = new Scanner(System.in);
        card2 = (int) (Math.random() * 13 + 1);
        while (start) {
            char playAgain = ' ';
            card1 = (int) (Math.random() * 13 + 1);

            System.out.println("Card is " + card1);

            do {
                System.out.println("(H)igher or (L)ower?");
                higherLower = scan.nextLine().charAt(0);
            }
            while (higherLower != 'h' && higherLower != 'l');

            if (higherLower == 'h' && card2 < card1) {
                    System.out.println("Card is " + card2);
                    System.out.println("Card is lower you lose. Play again? Y/N: ");
                    playAgain = scan.nextLine().toLowerCase().charAt(0);

                    while (playAgain != 'y' && playAgain != 'n')
                    {
                        System.out.println("Invalid entry, enter 'y' or 'n'");
                        playAgain = scan.nextLine().toLowerCase().charAt(0);
                    }

                    if (playAgain == 'n') {
                        start = false;
                        System.out.println("Thank you for playing.");
                        System.exit(0);
                    }
            }

            else if (higherLower == 'l' && card2 > card1) {
                    System.out.println("Card is " + card2);
                    System.out.println("Card is higher you lose. Play again? Y/N: ");
                    playAgain = scan.nextLine().toLowerCase().charAt(0);

                    while (playAgain != 'y' && playAgain != 'n')
                    {
                        System.out.println("Invalid entry, enter 'y' or 'n'");
                        playAgain = scan.nextLine().toLowerCase().charAt(0);
                    }

                    if (playAgain == 'n') {
                        start = false;
                        System.out.println("Thank you for playing.");
                    }
            }

            card1 = card2;
            card2 = (int) (Math.random() * 13 + 1);
        }

        scan.close();
    }

}