import java.util.Scanner;

public class J5_2 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		final int NUMBER_OF_QUESTIONS = 10; // Number of questions
	    int correctCount = 0; // Count the number of correct answers
	    int count = 0; // Count the number of questions
	    long startTime = System.currentTimeMillis();
	    String output = ""; // output string is initially empty
	    Scanner input = new Scanner(System.in);
	    
	    while (count < NUMBER_OF_QUESTIONS) {
	      // 1. Generate two random single-digit integers
	      int number1 = (int)(Math.random() * 16);
	      int number2 = (int)(Math.random() * 16);

	      // 2. If number1 < number2, swap number1 with number2
	      if (number1 < number2) {
	        int temp = number1;
	        number1 = number2;
	        number2 = temp;
	      }

	      // 3. Prompt the student to answer 揥hat is number1 � number2?�
	      System.out.print(
	        "What is " + number1 + " + " + number2 + "? ");
	      int answer = input.nextInt();

	      // 4. Grade the answer and display the result
	      if (number1 + number2 == answer) {
	        System.out.println("You are correct!");
	        correctCount++;
	      }
	      else
	        System.out.println("Your answer is wrong.\n" + number1 
	          + " + " + number2 + " should be " + (number1 + number2));

	      // Increase the count
	      count++;

	      output += "\n" + number1 + "-" + number2 + "=" + answer + 
	        ((number1 - number2 == answer) ? " correct" : " wrong");
	    }

	    long endTime = System.currentTimeMillis();
	    long testTime = endTime - startTime;

	    System.out.println("Correct count is " + correctCount + 
	      "\nTest time is " + testTime / 1000 + " seconds\n" + output);
	}

}