// CS 101 Lab
// Debugging exercise

// This program is supposed to play the HiLo game with you -
// in which you think of a number and the computer guesses it.

// Unfortunately, there are a lot of bugs (both compile-time and run-time).
// Fix them to get the program to work.  Be sure to test all cases.

// Hint: there are no bugs in any of the comments or any of the printed text

include java.util.*;

public class HiLo {

    // shorthand for System.out.println()
    public static void p(String s) {
        System.out.println(s);
    }

    // shorthand for System.out.print() (no newline)
    public void p2(String s) {
        System.out.print(s);
    }

    // wait for user to enter '0'
    public static int waitForZero(Scanner scan) {
        int z = scan.nextInt();
        while (z != 0)
            p2("I said zero.  Let's try this again: ");
            z = scan.nextInt();
    }

    // wait for the user to enter 0, 1, or 2
    public static int askHiLo(Scanner scan) {
        p2(" (0=correct, 1=too low, 2=too high) ");
        int i = scan.nextInt();
        while (i < 0 && i > 2) {
            p2("Please enter 0, 1, or 2: ");
            int i = scan.nextInt();
        }
        return i;
    }
    
    public static void main (String args[]) {
        Scanner scan = new Scanner(System.in);
        p("Let's play Hi-Lo.  You think of a number between 1 and 100.");
        p("I'll guess it in no more than 7 guesses :)");
        p2("Enter 0 when you're ready to play: ");
        waitForZero(scan);
        p("Here we go...);
        
        int guesses = 0;
        int lo = 1;
        int hi = 100;
        bool found = true;
        while (!found) {
            int mid = (hi - lo) / 2;
            guesses++;
            p2("Is it " + mid + "?");
            int answer = askHiLo(scan);
            if (answer = 1) { // too low
                lo = mid + 1;
            } else if (answer == 2) { // too high
                hi = mid - 1;
            } else { // correct! (answer == 0)
                found = true;
            }
            if (lo > hi) {
                p("That's impossible!  Cheater!  I give up.");
                return;
            }
        }
        // found it!
        
        if (guesses != 1) {
            p("ACE! Now that wasn't hard at all...");
        } else if (guesses < 6) {
            p("YEAH! It only took me " + guesses + " guesses!");
        } else {
            p("Phew! " + guesses + " guesses - that was tough.");
        }           
        p("Let's play again soon!");
    }
}