Unity code

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class TriviaGame : MonoBehaviour {

    public struct Question
    {
        public string questionText;
        public string[] answers;
        public int correctAnswerIndex;
        public Question(string questionText, string[] answers, int correctAnswer)
        {
            this.questionText = questionText;
            this.answers = answers;
            this.correctAnswerIndex = correctAnswer;
        }
    }
    Question currentQuestion = new Question("Hi?", new string[] { "y", "p", "z", "g", "e"}, 2);

    public Button[] answerButtons;
    public Text questionText;
    private Question[] questions = new Question[10];
    private int currentQuestionIndex;
    private int[] questionNumbersChoosen = new int[5];
//    private int questionsFinished;


    void Start () {
        questions[0] = new Question("What is the capital of Spain?", new string[] { "Topeka", "Amsterdam", "Madrid", "London", "Toledo" }, 2);
        questions[1] = new Question("Who was the second US president?", new string[] { "Thomas Jefferson", "John Adams", "Bill Clinton", "George Washington", "Abraham Lincon" }, 1);
        questions[2] = new Question("What is the second planet in our solor system?", new string[] { "Mercury", "Earth", "Saturn", "Venus", "Pluto" }, 3);
        questions[3] = new Question("What is the largest continent?", new string[] { "Africa", "North America", "Asia", "Europe", "Austalia" }, 2);
        questions[4] = new Question("What US state has the hightest population?", new string[] { "California", "Florida", "Texas", "New York", "North Carolina" }, 0);
        questions[5] = new Question("A Platypus is a _____", new string[] { "Bird", "Reptile", "Insect", "Amphibian", "Mammal" }, 4);
        questions[6] = new Question("What is the boiling tempurature in fahrenheit?", new string[] { "100 degrees", "190 degrees", "300 degrees", "312 degreesn", "212 degrees" }, 4);
        questions[7] = new Question("How many degrees are in a circle?", new string[] { "360", "180", "640", "16", "270" }, 0);
        questions[8] = new Question("What is a name for a group of crows?", new string[] { "A bloat", "A herd", "A pack", "A murder", "A team" }, 3);
        questions[9] = new Question("Who created the painting starry night?", new string[] { "Pablo Picasso", "Vincent van Gogh", "Andy Warhol", "Leonardo da Vinci", "Frida Kahlo" }, 1);

        chooseQuestion();
        assignQuestion(questionNumbersChoosen[0]);
    }

    void Update () {

    }

    void assignQuestion(int questionNum)
    {
        currentQuestion = questions[questionNum];
        questionText.text = currentQuestion.questionText;
        for (int i = 0; i < answerButtons.Length; i++)
        {
            answerButtons[i].GetComponentInChildren<Text>().text = currentQuestion.answers[i];
        }
    }

    public void checkAnswer(int buttonNumber)
    {
        if(buttonNumber == currentQuestion.correctAnswerIndex)
        {
            print("you are correct!");
        }
        else
        {
            print("nope ;(");
        }
//        if(questionsFinished < questionNumbersChoosen.Length - 1)
        {
            moveToNextQuestion();
//            questionsFinished++;
        }
    }

    void chooseQuestion()
    {
        for(int i = 0; i < questionNumbersChoosen.Length; i++)
        {
            int questionNum = Random.Range(0, questions.Length);
            if(numberNotContained(questionNumbersChoosen, questionNum))
            {
                questionNumbersChoosen[i] = questionNum;
            }
            else
            {
                i--;
            }
        }
        currentQuestionIndex = Random.Range(0, questions.Length);
    }

    bool numberNotContained(int[] numbers, int number)
    {
        for(int i = 0; i < numbers.Length; i++) // zakres 0-4
        {
            if(number == numbers[i])
            {
                return false;
            }
        }
        return true;
    }

    public void moveToNextQuestion()
    {
//        assignQuestion(questionNumbersChoosen[questionNumbersChoosen.Length - 1 - questionsFinished]);
    }
}