Binary Tree Preorder Traversal

Binary Tree Preorder 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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Pre-order traversal

Steps

Visit the root node
traverse the left sub-tree in pre-order
traverse the right sub-tree in pre-order

Algorithm

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

C Function

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

Example

Traverse the following binary tree by using pre-order traversal

Since, the traversal scheme, we are using is pre-order traversal, therefore, the first element to be printed is 18.
traverse the left sub-tree recursively. The root node of the left sub-tree is 211, print it and move to left.
Left is empty therefore print the right children and move to the right sub-tree of the root.
20 is the root of sub-tree therefore, print it and move to its left. Since left sub-tree is empty therefore move to the right and print the only element present there i.e. 190.
Therefore, the printing sequence will be 18, 211, 90, 20, 190.

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