Driver program to test above functions
int main ( ) { struct Node * root = newNode ( 20 ) ; root -> left = newNode ( 8 ) ; root -> right = newNode ( 22 ) ; root -> left -> left = newNode ( 4 ) ; root -> left -> right = newNode ( 12 ) ; root -> left -> right -> left = newNode ( 10 ) ; root -> left -> right -> right = newNode ( 14 ) ; cout << " Level ▁ Order ▁ traversal ▁ between ▁ given ▁ two ▁ levels ▁ is " ; printLevels ( root , 2 , 3 ) ; return 0 ; }