Preorder Tree Traversal of a Binary Tree

That is another form of preorder tree traversal of a binary tree. We can solve this problem in a two way using recursion and iterative.

preorder tree traversal

Recursive approach

This recursive approach start with root node of tree. And follow this steps.

1) When current node are not NULL then print that element value. After that visit left child of this current node. when visited node is not NULL then repeat this step. Otherwise do step 2.

2) Visit the right subtree of current node, if this is not NULL then execute step 1.

Here given code implementation process.

Iterative approach

When we are need to traverse tree preorder form. Then we can used stack data structure to solve this problem.

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