import java.util.Scanner; // Needed for the Scanner class
import java.util.Random;  // Needed for the Random class

/**
   This program demonstrates the Random class.
*/

public class MathTutor
{
   public static void main(String[] args)
   {
      int number1;      // A number
      int number2;      // Another number
      int sum;          // The sum of the numbers
      int userAnswer;   // The user's answer
      
      // Create a Scanner object for keyboard input.
      Scanner keyboard = new Scanner(System.in);
      
      // Create a Random class object.
      Random randomNumbers = new Random();

      // Get two random numbers.
      number1 = randomNumbers.nextInt(100);
      number2 = randomNumbers.nextInt(100);

      // Display an addition problem.
      System.out.println("What is the answer to the " +
                         "following problem?");
      System.out.print(number1 + " + " +
                       number2 + " = ? ");

      // Calculate the answer.
      sum = number1 + number2;

      // Get the user's answer.
      userAnswer = keyboard.nextInt();

      // Display the user's results.
      if (userAnswer == sum)
         System.out.println("Correct!");
      else
      {
         System.out.println("Sorry, wrong answer. " +
                            "The correct answer is " +
                            sum);
      }
   }
}