Let us create following BST 50 / \ 30 70 / \ / \ 20 40 60 80
struct Node * root = NULL ; root = insert ( root , 50 ) ; insert ( root , 30 ) ; insert ( root , 20 ) ; insert ( root , 40 ) ; insert ( root , 70 ) ; insert ( root , 60 ) ; insert ( root , 80 ) ;