Binary Tree Postorder Traversal

Binary Tree Postorder Traversal with Introduction, Asymptotic Analysis, Array, Pointer, Structure, Singly Linked List, Doubly Linked List, Circular Linked List, Binary Search, Linear Search, Sorting, Bucket Sort, Comb Sort, Shell Sort, Heap Sort, Merge Sort, Selection Sort, Counting Sort, Stack, Qene, Circular Quene, Graph, Tree, B Tree, B+ Tree, Avl Tree etc.

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Post-order traversal

Steps

Traverse the left sub-tree in post-order
Traverse the right sub-tree in post-order
visit the root

Algorithm

Step 1: Repeat Steps 2 to 4 while TREE != NULL
Step 2: POSTORDER(TREE -> LEFT)
Step 3: POSTORDER(TREE -> RIGHT)
Step 4: Write TREE -> DATA
[END OF LOOP]
Step 5: END

C Function

void post-order(struct treenode *tree)
	{
		if(tree != NULL)
		{
			post-order(tree→ left);
			post-order(tree→ right);
			printf("%d",tree→ root);
		}
	}

Example

Traverse the following tree by using post-order traversal

Print the left child of the left sub-tree of binary tree i.e. 23.
print the right child of the left sub-tree of binary tree i.e. 89.
print the root node of the left sub-tree i.e. 211.
Now, before printing the root node, move to right sub-tree and print the left child i.e. 10.
print 32 i.e. right child.
Print the root node 20.
Now, at the last, print the root of the tree i.e. 18.

The printing sequence will be 23, 89, 211, 10, 32, 18.

Next TopicDoubly Linked List

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