// CSE 142, Summer 2008 (Helene Martin)
// Gives the user multiplication problems to solve.
// If the user gets one right, s/he is given another.
// When the user gets it wrong, the program stops and reports the number of correct answers.

import java.util.*;

public class MultTutor {
	public static void main(String[] args) {
		Random r = new Random();
		Scanner console = new Scanner(System.in);
		int count = 0;
		
		while(askQuestion(r, console)) {
			count++;
		}
		
		System.out.println("You solved " + count + " correctly.");
	}
	
	// Asks the user one multiplication problem
	// returns whether or not they get it right
	public static boolean askQuestion(Random r, Scanner console) {
		int num1 = r.nextInt(20) + 1;
		int num2 = r.nextInt(20) + 1;
		
		int product = num1 * num2;
		System.out.print(num1 + " * " + num2 + " = ");
		int ans = console.nextInt();
		
		if(ans == product) {
			System.out.println("Correct!");
			return true;
		} else {
			System.out.println("Incorrect; the answer was " + product);
			return false;
		}
	} 
}