Searching In A Binary Search Tree In C++

#include<bits/stdc++.h>
using namespace std;
class Tree
{
public:
  int data;
  Tree *left = NULL, *right = NULL;
  // Constructor initialised
    Tree (int x)
  {
    data = x;
    left = NULL;
    right = NULL;
  }
};

int search (Tree * root, int value)
{
  while (root != NULL)
    {
      if (value > root->data)
	root = root->right;

      else if (value < root->data)
	root = root->left;

      else
	return 1;
    }

  return 0;
}

void inorder_traversal (Tree * root)
{
  if (root == NULL)
    return;
  inorder_traversal (root->left);

  cout << root->data << " ";

  inorder_traversal (root->right);

}

Tree *insert_node (Tree * root, int x)
{

  if (root == NULL)
    {
      Tree *temp = new Tree (x);
      return temp;
    }

  if (root->data > x)
    {
      root->left = insert_node (root->left, x);
    }

  else
    {
      root->right = insert_node (root->right, x);
    }
  return root;

}

Tree *Delete (Tree * root, int x)
{

  if (root == NULL)
    {
      cout << "Node not found ";
      return NULL;
    }

  if (root->data > x)
    {
      root->left = Delete (root->left, x);
    }

  else if (root->data < x)
    {
      root->right = Delete (root->right, x);
    }
  else
    {

      if (root->left == NULL)
	{
	  Tree *temp = root->right;
	  free (root);
	  return temp;
	}

      else if (root->right == NULL)
	{
	  Tree *temp = root->left;
	  free (root);
	  return temp;
	}
      else
	{

	  Tree *temp = root->right;

	  while (temp->left != NULL)
	    temp = temp->left;

	  root->data = temp->data;

	  root->right = Delete (root->right, temp->data);
	}
    }
  return root;

}

int main ()
{
  Tree *root = new Tree (15);
  root->left = new Tree (13);
  root->right = new Tree (18);
  root->left->left = new Tree (8);
  root->left->right = new Tree (14);
  root->right->left = new Tree (16);
  root->right->right = new Tree (19);
  
  int delete_item = 18;
  cout << "Inorder Traversal :";
  inorder_traversal (root);
  cout << endl;
  cout << endl;

  cout << "17 inserted \n";
  insert_node(root,17);
  cout << "Inorder Traversal :";
  inorder_traversal (root);
  cout << endl;
  cout << endl;

  cout << "18 deleted \n";
  Delete (root, delete_item);
  cout << "Inorder Traversal :";
  inorder_traversal (root);
  cout << endl;
  cout<< "Searching for element 15 \n";
  cout << search (root, 15);

}