using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var questionGenerator = new QuestionGenerator();

        Console.WriteLine(questionGenerator.newQuestion());

    }

}

​

public struct Question {

    public string question;

    public int[] posibleAnswers;

    public int correctAnswer;

}

​

public enum BasicOperator {

    addition, subtraction

}

​

public class QuestionGenerator

{

    public static void Main() {}

    public Question newQuestion(BasicOperator type) {

        switch (type) {

            case BasicOperator.addition:

            return newAdditionQuestion();

        }

    }

    public Question[] questionsForPractice(BasicOperator type) {

        Question[] questions = new Question[20];

        while(q.Length < 20) {

            questions.push(newQuestion(type));

        }

        return questions;

    }

    private Question newAdditionQuestion() {

        int value1 = new Random().Next(1, 9);

        int value2 = new Random().Next(1, 9);

        Question q = new Question();

        q.question = value1 + " + " + value2 + " = ?";

        q.correctAnswer = value1 + value2;

        //q.posibleAnswers

        return q;

    }

}