Driver code
int main ( ) { Node * root = new Node ( 1 ) ; root -> left = new Node ( 2 ) ; root -> right = new Node ( 3 ) ; root -> left -> left = new Node ( 4 ) ; root -> left -> right = new Node ( 5 ) ; root -> right -> left = new Node ( 6 ) ; root -> right -> right = new Node ( 7 ) ; root -> left -> left -> left = new Node ( 8 ) ; root -> left -> left -> right = new Node ( 9 ) ; root -> left -> right -> left = new Node ( 10 ) ; root -> left -> right -> right = new Node ( 11 ) ; root -> right -> left -> left = new Node ( 12 ) ; root -> right -> left -> right = new Node ( 13 ) ; root -> right -> right -> left = new Node ( 14 ) ; root -> right -> right -> right = new Node ( 15 ) ; print2D ( root ) ; return 0 ; }