I'm confused

Questions & Answers
1

I have two classes within a script
using UnityEngine;
using System.Collections;

public class QuestionClass2 : MonoBehaviour 
{
    public Question[] arrayOfQuestions;
    public Question currentQuestion;
    public bool showQuestion = true;
    private int coinToss;
    public bool heads;
    public bool tails;
	//public QuestionClass2 test;
	
	public class Question
    {
		
	   public int selectedAnswer = -1;
       public int correctAnswerIndex;
       private string questionText;
       private Rect questionRect;
       private string[] answers = new string[4];
       private string[] displayAnswers = new string[4];
       private Rect[] answerRects = new Rect[4];
       private string correctAnswer;
       private Rect correctRect;
       private int questionWidth = 300;
       private int answerWidth = 75;
       private int questionHeight = 1000;
       private int correctWidth = 100;
       
 
       public Question(Vector2 pos, string q, string a, string b, string c, string d, int correct)
       {
         questionText = q;
         answers[0]    = a;
         answers[1]    = b;
         answers[2]    = c;
         answers[3]    = d;
 
         string st = "ABCD";
		
		   for(int i = 0; i < answers.Length; i++)
         {
          displayAnswers <em>= st _+ ": " + answers*;*_</em>

}

correctAnswerIndex = correct;
correctAnswer = "Correct answer: " + answers[correct];
CalcRects (pos);
}

* void CalcRects(Vector2 pos)*
{
* Rect rect = new Rect();*
* rect.x = pos.x;*
* rect.y = pos.y;*
* rect.width = questionWidth;*
* rect.height = questionHeight;*
* questionRect = rect;*

* rect.x += questionWidth;*
* rect.width = answerWidth;*

* for (int i = 0; i < answers.Length; i++)*
* {*
_ answerRects = rect;
* rect.x += answerWidth;
}*_

* rect.width = correctWidth;*
* correctRect = rect;*
}

public void DisplayQuestion()
{
GUI.Label(questionRect, questionText);
for (int i = 0; i < answers.Length; i++)
* {*
GUI.Label(answerRects_, displayAnswers*);
}
if (selectedAnswer != -1)
{
GUI.Label(correctRect, correctAnswer);
}
}*_

* public void CheckForClick(Vector2 pos)*
* {*
* for (int i = 0; i < answers.Length; i++)*
* {*
_ if (answerRects*.Contains(pos))
{
selectedAnswer = i;
break;
}
}
}
}
void OnGUI()
{*
Event e = Event.current;_

if (e.type == EventType.Repaint)
* {*
* //QuestionClass2 script = (QuestionClass2)(GameObject.Find(“QuestionManager”).GetComponent(“QuestionClass2”));*
* currentQuestion.DisplayQuestion();*
* }*

//if (e.type == EventType.MouseDown)
// {
* //foreach(Question thisQ in arrayOfQuestions)*
* // {*
* // thisQ.CheckForClick(e.mousePosition);*
* //}*
// }
}
}
Ive clearly stated that currentQuestion is appart of QuestionClass2 and DisplayQuestion is apart of the QuestionClass, why am i getting an error object reference not set to an instance of object.

2

That’s because you haven’t initialized/created the currentQuestion, you only specified its type is Question. That is not enough. Your game doesn’t know what the currentQuestion holds inside, because you haven’t called the constructor (public Question(...)), so it is null. This is what your error says – “object reference not set to an instance of object”, in other words, the variable currentQuestion that is supposed to hold an object reference to some Question doesn’t have one.

You have to, at least for starters, do

currentQuestion = new Question(new Vector2(30, 0), "which one?", "one", "two", "three", "four", 2);

Probably in void Start() until you add proper selection. Your old code had void Start() with question initialization, but it seems you have deleted that from this version.