import java.util.Scanner;



public class SubtractionTutorLoop {

  public static void main(String[] args) {

    final int NUMBER_OF_QUESTIONS = 5; // 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 = "";

    Scanner scanner = new Scanner(System.in);



    while (count < NUMBER_OF_QUESTIONS) {

      // 1. Generate two random single-digit integers
      int number1 = (int)(Math.random() * 10);

      int number2 = (int)(Math.random() * 10);



      // 2. If number1 < number2, swap number1 with number2
      if (number1 < number2) {

        int temp = number1;

        number1 = number2;

        number2 = temp;

      }



      // 3. Prompt the student to answer “what is number1 – number2?”
      System.out.print(

        "What is " + number1 + " - " + number2 + "? ");

      int answer = scanner.nextInt();



      // 4. Grade the annser 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);

  }

}