// RecursivePreOrderTraverse travese by pre-order recursively.
RecursivePreOrderTraverse travese by pre-order recursively.
// RecursivePreOrderTraverse travese by pre - order recursively .
func RecursivePreOrderTraverse(n *Node) {
	if n != nil {
		fmt.Printf("%d ", n.Key)
		RecursivePreOrderTraverse(n.Left)
		RecursivePreOrderTraverse(n.Right)
	}
}
func RecursivePreOrderTraverse ( n * Node ) { if n != nil { fmt . Printf ( " " , n . Key ) RecursivePreOrderTraverse ( n . Left ) RecursivePreOrderTraverse ( n . Right ) } }
RecursivePreOrderTraverse travese by pre-order recursively.
RecursivePreOrderTraverse travese by pre - order recursively .