import java.util.Scanner;



public class SubtractionTutor {

  public static void main(String[] args) {

    // 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 + "? ");

    Scanner scanner = new Scanner(System.in);

    int answer = scanner.nextInt();



    // 4. Grade the answer and display the result
    if (number1 - number2 == answer)

      System.out.println("You are correct!");

    else

      System.out.println("Your answer is wrong.\n" + number1 + " - "

        + number2 + " should be " + (number1 - number2));

  }

}