// Helene Martin, CSE 142
// Plays an addition game with the user: prompts them with
// addition puzzles with 2 - 5 operands until they get
// 3 wrong

// goal: demonstrate a systematic process for writing
// a medium-size program with a game loop.
// we started by getting a single game to work
// we put that game in a method
// we called that game in a while loop
// we noticed we needed information from the method so returned points
import java.util.*;
public class AdditionGame {
	public static void main(String[] args) {
		Random rand = new Random();
		Scanner console = new Scanner(System.in);
		
		int wrong = 0;
		int points = 0;
		while (wrong < 3) {
			int point = playGame(rand, console);
			if (point == 0) {
				wrong++;
			} else {
				points++;
			}
		}
		System.out.println("You earned " + points + " points");
	}
	
	// plays a single addition game with the user.  Returns
	// the number of points earned (1 or 0)
	public static int playGame(Random rand, Scanner console) {
		int operands = rand.nextInt(4) + 2;
		
		int operand = rand.nextInt(10) + 1;
		System.out.print(operand);
		int sum = operand;
		for (int i = 1; i < operands; i++) {
			operand = rand.nextInt(10) + 1;
			System.out.print(" + " + operand);
			sum += operand;			
		}
		// great debugging trick:
		// System.out.print(" = (THE ANSWER IS " + sum + ")");
		System.out.print(" = ");
		int userGuess = console.nextInt();
		if (userGuess != sum) {
			System.out.println("Wrong!  The answer was " + sum);
			return 0;
		} else {
			return 1;
		}
	}
}