// Function to evaluate quiz for the user input
public void EvaluateQuiz()
{
bool isCorrectResponse = AdditionTutor.CheckAnswer(InputValue);
// Write quiz result to file
WriteQuizResultToFile();
// Display quiz result
Output = isCorrectResponse ? CORRECT_ANSWER_RESPONSE : String.Format(INCORRECT_ANSWER_RESPONSE, InputValue);
OutputExpression = AdditionTutor.Expression();
DisplayNewQuiz = VISIBILTIY_HIDDEN;
DisplayQuizResult = VISIBILITY_VISIBLE;
}
// Function to write quiz content to file
public void WriteQuizResultToFile()
{
File.AppendAllText(FILE_NAME,
String.Format(QUIZ_TEXT_FORMAT_FOR_FILE, AdditionTutor.Expression(), InputValue));
}