Binary tree: It is a tree data structure which comes under hierarchical data structure. It is made of nodes that have a left child, right child and a data element. Tree traversal: There are 3 common methods Inorder traversal Preorder traversal Postorder traversal In inorder traversal, the left subtree is encountered first, then data node and then the right subtree. In preorder traversal, the data node is encountered first, then left subtree and then the right subtree. In postorder traversal, the left subtree is encountered first, then right subtree and then the data node. Algorithm for Postorder traversal: Traverse through the leftmost subtree and then print the element. Ttraverse the rightmost subtree and then print the element. At last visit and print the root node.

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Chapter 21, Problem 20RQE

Program Plan Intro

Binary tree:

It is a tree data structure which comes under hierarchical data structure.

It is made of nodes that have a left child, right child and a data element.

Tree traversal:

There are 3 common methods

Inorder traversal

Preorder traversal

Postorder traversal

In inorder traversal, the left subtree is encountered first, then data node and then the right subtree.

In preorder traversal, the data node is encountered first, then left subtree and then the right subtree.

In postorder traversal, the left subtree is encountered first, then right subtree and then the data node.

Algorithm for Postorder traversal:

Traverse through the leftmost subtree and then print the element.

Ttraverse the rightmost subtree and then print the element.

At last visit and print the root node.

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