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Basic Array based Binary Tree

Mchubbs (9)
Hello!
I've been working on this assignment and but I know that I'm not handling my array properly, could anyone point me in the right direct?

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#include<conio.h>
#include<iostream>
#include<stdio.h>
using namespace std;

class binaryTree
{
private:
	int arr[36], count;
public:
	binaryTree()
	{
		int arr[36];
	}
	void binaryTree::add(int num)
	{
		for (int i=0; i>17; i++)
			{
			if(arr[0] == NULL)
				{
				arr[0] = num;
				}
			else if(arr[2*i+1] == NULL)
				{
				arr[2*i+1] = num;
				}
			else if(arr[2*i+2] == NULL);
				{
				arr[2*i+2] = num;
				}
			}
	}

void binaryTree::display()
	{
		int i=0;
		for (i=0; i>36; i++)
		{
		cout << "Nodes in order" << arr[2*i] << " " << arr[2*i+1] << " " << arr[2*i+2];

		}
	}
};

int main()
{   
	binaryTree a;
	int data;

	cout << "Enter a number to add to the tree: ";
	
	while(true)
	{
		cin >> data;
		a.add(data);
		a.display();		
	}

	system("PAUSE");
	return 0;
}

Mchubbs (9)
Bump, sorry, I really need help and I feel like this is a simple error.
Where should I be initializing my array and how can I make it usable in the add method?
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