CODE EXAMPLE FOR CPP

binary tree

#include <bits/stdc++.h>
using namespace std;
  
class Node {
  public:
    int data;
    Node* left;
    Node* right;
  
    // Val is the key or the value that
    // has to be added to the data part
    Node(int val)
    {
        data = val;
  
        // Left and right child for node
        // will be initialized to null
        left = NULL;
        right = NULL;
    }
};
  
int main()
{
  
    /*create root*/
    Node* root = new Node(1);
    /* following is the tree after above statement
  
             1
            / 
        NULL   NULL
    */
  
    root->left = new Node(2);
    root->right = new Node(3);
    /* 2 and 3 become left and right children of 1
                  1
                /   
                2      3
               /      / 
            NULL NULL NULL NULL
    */
  
    root->left->left = new Node(4);
    /* 4 becomes left child of 2
              1
            /    
           2      3
          /      / 
         4 NULL NULL NULL
        / 
      NULL NULL
    */
  
    return 0;
}