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.
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.

1) Preorder traversal of binary tree using recursion in c
2) Preorder traversal of binary tree using recursion in java
3) Preorder traversal of binary tree using recursion in c++
4) Preorder traversal of binary tree using recursion in golang
5) Preorder traversal of binary tree using recursion in c#
6) Preorder traversal of binary tree using recursion in python
7) Preorder traversal of binary tree using recursion in php
8) Preorder traversal of binary tree using recursion in ruby
9) Preorder traversal of binary tree using recursion in node js
10) Preorder traversal of binary tree using recursion in typescript
11) Preorder traversal of binary tree using recursion in scala
12) Preorder traversal of binary tree using recursion in swift
13) Preorder traversal of binary tree using recursion in vb.net
14) Preorder traversal of binary tree using recursion in kotlin
Iterative approach
When we are need to traverse tree preorder form. Then we can used stack data structure to solve this problem.

1) Preorder traversal of binary tree using stack in java
2) Preorder traversal of binary tree using stack in c
3) Preorder traversal of binary tree using stack in c++
4) Preorder traversal of binary tree using stack in c#
5) Preorder traversal of binary tree using stack in php
6) Preorder traversal of binary tree using stack in golang
7) Preorder traversal of binary tree using stack in ruby
8) Preorder traversal of binary tree using stack in python
9) Preorder traversal of binary tree using stack in vb.net
10) Preorder traversal of binary tree using stack in node js
11) Preorder traversal of binary tree using stack in typescript
12) Preorder traversal of binary tree using stack in scala
13) Preorder traversal of binary tree using stack in swift
14) Preorder traversal of binary tree using stack in kotlin
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