Level Order Tree Traversal Using Recursion

Here given code implementation process.

/*
  C Program 
+ Level Order Tree Traversal Using Recursion

*/
#include<stdio.h>

#include<stdlib.h>
 //structure of Binary Tree node
struct Node
{
	int data;
	struct Node *left, *right;
};
//Create a binary tree nodes
struct Node *insert(int data)
{
	//create dynamic memory to new binary tree node
	struct Node *new_node = (struct Node *) malloc(sizeof(struct Node));
	if (new_node != NULL)
	{
		//set data and pointer values
		new_node->data = data;
		new_node->left = NULL; //Initially node left-pointer is NULL
		new_node->right = NULL; //Initially node right-pointer is NULL
	}
	else
	{
		printf("Memory Overflow\n");
		exit(0); //Terminate program execution
	}
	//return reference
	return new_node;
}
//Find height of given binary tree
int tree_height(struct Node *root)
{
	if (root != NULL)
	{
		//Recursively calculating  height of tree
		int a = tree_height(root->left);
		int b = tree_height(root->right);
		//returning a height of largest subtree
		if (a > b)
		{
			return a + 1;
		}
		else
		{
			return b + 1;
		}
	}
	else
	{
		return 0;
	}
}
//Display particular level from left to right
void display_level(struct Node *root, int level, int counter)
{
	if (root == NULL)
	{
		return;
	}
	if (counter == level)
	{
		printf("%d ", root->data);
		return;
	}
	//Recursively display given level of  binary tree
	display_level(root->left, level, counter + 1);
	display_level(root->right, level, counter + 1);
}
void level_order(struct Node *root)
{
	//Find find the height of tree
	int height = tree_height(root);
	int counter = 1;
	//Display tree level from top to bottom left to right
	while (counter <= height)
	{
		display_level(root, counter, 1);
		counter++;
	}
}
int main()
{
	struct Node *root = NULL;
	/*Make A Binary Tree
	-----------------------
	           9
	         /   \
	        12    3
	       /     / \
	      4    15   6
	     /     / \
	    7     8   19
	*/
	//Insertion of binary tree nodes
	root = insert(9);
	root->left = insert(12);
	root->right = insert(3);
	root->right->right = insert(6);
	root->right->left = insert(15);
	root->left->left = insert(4);
	root->left->left->left = insert(7);
	root->right->left->left = insert(8);
	root->right->left->right = insert(19);
	//Display Tree elements
	level_order(root);
	return 0;
}

Output

9 12 3 4 15 6 7 8 19
/*
  Java Program 
  Level Order Tree Traversal Using Recursion
*/
//Binary Tree Node
class Node
{
	public int data;
	public Node left;
	public Node right;
	public Node(int value)
	{
		this.data = value;
		this.right = null;
		this.left = null;
	}
}
class BinaryTree
{
	public Node root;
	public BinaryTree()
	{
		this.root = null;
	}
	//Find height of given binary tree
	public int tree_height(Node root)
	{
		if (root != null)
		{
			//Recursively calculating  height of tree
			int a = tree_height(root.left);
			int b = tree_height(root.right);
			//returning a height of largest subtree
			if (a > b)
			{
				return a + 1;
			}
			else
			{
				return b + 1;
			}
		}
		else
		{
			return 0;
		}
	}
	//Display particular level from left to right
	public void display_level(Node root, int level, int counter)
	{
		if (root == null)
		{
			return;
		}
		if (counter == level)
		{
			System.out.print(" " + root.data);
			return;
		}
		//Recursively display given level of  binary tree
		display_level(root.left, level, counter + 1);
		display_level(root.right, level, counter + 1);
	}
	public void level_order()
	{
		//Find find the height of tree
		int height = tree_height(this.root);
		int counter = 1;
		//Display tree level from top to bottom left to right
		while (counter <= height)
		{
			display_level(this.root, counter, 1);
			counter++;
		}
	}
	public static void main(String[] args)
	{
		BinaryTree obj = new BinaryTree();
		/* Make A Binary Tree
    -------------------
               9
             /   \
            12    3
           /     / \
          4    15   6
         /     / \
        7     8   19
    */
		//Insert binary tree nodes
		obj.root = new Node(9);
		obj.root.left = new Node(12);
		obj.root.right = new Node(3);
		obj.root.right.right = new Node(6);
		obj.root.right.left = new Node(15);
		obj.root.left.left = new Node(4);
		obj.root.left.left.left = new Node(7);
		obj.root.right.left.left = new Node(8);
		obj.root.right.left.right = new Node(19);
		//Display Tree elements
		obj.level_order();
	}
}

Output

 9 12 3 4 15 6 7 8 19
//Include header file
#include <iostream>

using namespace std;
/*
  C++ Program 
  Level Order Tree Traversal Using Recursion
*/
//Binary Tree Node
class Node
{
	public: int data;
	Node * left;
	Node * right;
	Node(int value)
	{
		this->data = value;
		this->right = NULL;
		this->left = NULL;
	}
};
class BinaryTree
{
	public: Node * root;
	BinaryTree()
	{
		this->root = NULL;
	}
	//Find height of given binary tree
	int tree_height(Node * root)
	{
		if (root != NULL)
		{
			//Recursively calculating  height of tree
			int a = this->tree_height(root->left);
			int b = this->tree_height(root->right);
			//returning a height of largest subtree
			if (a > b)
			{
				return a + 1;
			}
			else
			{
				return b + 1;
			}
		}
		else
		{
			return 0;
		}
	}
	//Display particular level from left to right
	void display_level(Node * root, int level, int counter)
	{
		if (root == NULL)
		{
			return;
		}
		if (counter == level)
		{
			cout << " " << root->data;
			return;
		}
		//Recursively display given level of  binary tree
		this->display_level(root->left, level, counter + 1);
		this->display_level(root->right, level, counter + 1);
	}
	void level_order()
	{
		//Find find the height of tree
		int height = this->tree_height(this->root);
		int counter = 1;
		//Display tree level from top to bottom left to right
		while (counter <= height)
		{
			this->display_level(this->root, counter, 1);
			counter++;
		}
	}
};
int main()
{
	BinaryTree obj = BinaryTree();
	/* Make A Binary Tree
	    -------------------
	               9
	             /   \
	            12    3
	           /     / \
	          4    15   6
	         /     / \
	        7     8   19
	    */
	//Insert binary tree nodes
	obj.root = new Node(9);
	obj.root->left = new Node(12);
	obj.root->right = new Node(3);
	obj.root->right->right = new Node(6);
	obj.root->right->left = new Node(15);
	obj.root->left->left = new Node(4);
	obj.root->left->left->left = new Node(7);
	obj.root->right->left->left = new Node(8);
	obj.root->right->left->right = new Node(19);
	//Display Tree elements
	obj.level_order();
	return 0;
}

Output

 9 12 3 4 15 6 7 8 19
//Include namespace system
using System;
/*
  C# Program 
  Level Order Tree Traversal Using Recursion
*/
//Binary Tree Node
class Node
{
	public int data;
	public Node left;
	public Node right;
	public Node(int value)
	{
		this.data = value;
		this.right = null;
		this.left = null;
	}
}
class BinaryTree
{
	public Node root;
	public BinaryTree()
	{
		this.root = null;
	}
	//Find height of given binary tree
	public int tree_height(Node root)
	{
		if (root != null)
		{
			//Recursively calculating  height of tree
			int a = tree_height(root.left);
			int b = tree_height(root.right);
			//returning a height of largest subtree
			if (a > b)
			{
				return a + 1;
			}
			else
			{
				return b + 1;
			}
		}
		else
		{
			return 0;
		}
	}
	//Display particular level from left to right
	public void display_level(Node root, int level, int counter)
	{
		if (root == null)
		{
			return;
		}
		if (counter == level)
		{
			Console.Write(" " + root.data);
			return;
		}
		//Recursively display given level of  binary tree
		display_level(root.left, level, counter + 1);
		display_level(root.right, level, counter + 1);
	}
	public void level_order()
	{
		//Find find the height of tree
		int height = tree_height(this.root);
		int counter = 1;
		//Display tree level from top to bottom left to right
		while (counter <= height)
		{
			display_level(this.root, counter, 1);
			counter++;
		}
	}
	public static void Main(String[] args)
	{
		BinaryTree obj = new BinaryTree();
		/* Make A Binary Tree
		    -------------------
		               9
		             /   \
		            12    3
		           /     / \
		          4    15   6
		         /     / \
		        7     8   19
		    */
		//Insert binary tree nodes
		obj.root = new Node(9);
		obj.root.left = new Node(12);
		obj.root.right = new Node(3);
		obj.root.right.right = new Node(6);
		obj.root.right.left = new Node(15);
		obj.root.left.left = new Node(4);
		obj.root.left.left.left = new Node(7);
		obj.root.right.left.left = new Node(8);
		obj.root.right.left.right = new Node(19);
		//Display Tree elements
		obj.level_order();
	}
}

Output

 9 12 3 4 15 6 7 8 19
<?php
/*
  Php Program 
  Level Order Tree Traversal Using Recursion
*/
//Binary Tree Node
class Node
{
	public $data;
	public $left;
	public $right;

	function __construct($value)
	{
		$this->data = $value;
		$this->right = null;
		$this->left = null;
	}
}
class BinaryTree
{
	public $root;

	function __construct()
	{
		$this->root = null;
	}
	//Find height of given binary tree
	public	function tree_height($root)
	{
		if ($root != null)
		{
			//Recursively calculating  height of tree
			$a = $this->tree_height($root->left);
			$b = $this->tree_height($root->right);
			//returning a height of largest subtree
			if ($a > $b)
			{
				return $a + 1;
			}
			else
			{
				return $b + 1;
			}
		}
		else
		{
			return 0;
		}
	}
	//Display particular level from left to right
	public	function display_level($root, $level, $counter)
	{
		if ($root == null)
		{
			return;
		}
		if ($counter == $level)
		{
			echo " ". $root->data;
			return;
		}
		//Recursively display given level of  binary tree
		$this->display_level($root->left, $level, $counter + 1);
		$this->display_level($root->right, $level, $counter + 1);
	}
	public	function level_order()
	{
		//Find find the height of tree
		$height = $this->tree_height($this->root);
		$counter = 1;
		//Display tree level from top to bottom left to right
		while ($counter <= $height)
		{
			$this->display_level($this->root, $counter, 1);
			$counter++;
		}
	}
}

function main()
{
	$obj = new BinaryTree();
	/* Make A Binary Tree
	    -------------------
	               9
	             /   \
	            12    3
	           /     / \
	          4    15   6
	         /     / \
	        7     8   19
	    */
	//Insert binary tree nodes
	$obj->root = new Node(9);
	$obj->root->left = new Node(12);
	$obj->root->right = new Node(3);
	$obj->root->right->right = new Node(6);
	$obj->root->right->left = new Node(15);
	$obj->root->left->left = new Node(4);
	$obj->root->left->left->left = new Node(7);
	$obj->root->right->left->left = new Node(8);
	$obj->root->right->left->right = new Node(19);
	//Display Tree elements
	$obj->level_order();
}
main();

Output

 9 12 3 4 15 6 7 8 19
/*
  Node Js Program 
  Level Order Tree Traversal Using Recursion
*/
//Binary Tree Node
class Node
{
	constructor(value)
	{
		this.data = value;
		this.right = null;
		this.left = null;
	}
}
class BinaryTree
{
	constructor()
	{
		this.root = null;
	}
	//Find height of given binary tree
	tree_height(root)
	{
		if (root != null)
		{
			//Recursively calculating  height of tree
			var a = this.tree_height(root.left);
			var b = this.tree_height(root.right);
			//returning a height of largest subtree
			if (a > b)
			{
				return a + 1;
			}
			else
			{
				return b + 1;
			}
		}
		else
		{
			return 0;
		}
	}
	//Display particular level from left to right
	display_level(root, level, counter)
	{
		if (root == null)
		{
			return;
		}
		if (counter == level)
		{
			process.stdout.write(" " + root.data);
			return;
		}
		//Recursively display given level of  binary tree
		this.display_level(root.left, level, counter + 1);
		this.display_level(root.right, level, counter + 1);
	}
	level_order()
	{
		//Find find the height of tree
		var height = this.tree_height(this.root);
		var counter = 1;
		//Display tree level from top to bottom left to right
		while (counter <= height)
		{
			this.display_level(this.root, counter, 1);
			counter++;
		}
	}
}

function main()
{
	var obj = new BinaryTree();
	/* Make A Binary Tree
	    -------------------
	               9
	             /   \
	            12    3
	           /     / \
	          4    15   6
	         /     / \
	        7     8   19
	    */
	//Insert binary tree nodes
	obj.root = new Node(9);
	obj.root.left = new Node(12);
	obj.root.right = new Node(3);
	obj.root.right.right = new Node(6);
	obj.root.right.left = new Node(15);
	obj.root.left.left = new Node(4);
	obj.root.left.left.left = new Node(7);
	obj.root.right.left.left = new Node(8);
	obj.root.right.left.right = new Node(19);
	//Display Tree elements
	obj.level_order();
}
main();

Output

 9 12 3 4 15 6 7 8 19
#   Python Program 
#   Level Order Tree Traversal Using Recursion

# Binary Tree Node
class Node :
	
	def __init__(self, value) :
		self.data = value
		self.right = None
		self.left = None
	

class BinaryTree :
	
	def __init__(self) :
		self.root = None
	
	# Find height of given binary tree
	def tree_height(self, root) :
		if (root != None) :
			# Recursively calculating  height of tree
			a = self.tree_height(root.left)
			b = self.tree_height(root.right)
			# returning a height of largest subtree
			if (a > b) :
				return a + 1
			else :
				return b + 1
			
		else :
			return 0
		
	
	# Display particular level from left to right
	def display_level(self, root, level, counter) :
		if (root == None) :
			return
		
		if (counter == level) :
			print(" ", root.data, end = "")
			return
		
		# Recursively display given level of  binary tree
		self.display_level(root.left, level, counter + 1)
		self.display_level(root.right, level, counter + 1)
	
	def level_order(self) :
		# Find find the height of tree
		height = self.tree_height(self.root)
		counter = 1
		# Display tree level from top to bottom left to right
		while (counter <= height) :
			self.display_level(self.root, counter, 1)
			counter += 1
		
	

def main() :
	obj = BinaryTree()
	#  Make A Binary Tree
	#     -------------------
	#                9
	#              /   \
	#             12    3
	#            /     / \
	#           4    15   6
	#          /     / \
	#         7     8   19
	#     
	
	# Insert binary tree nodes
	obj.root = Node(9)
	obj.root.left = Node(12)
	obj.root.right = Node(3)
	obj.root.right.right = Node(6)
	obj.root.right.left = Node(15)
	obj.root.left.left = Node(4)
	obj.root.left.left.left = Node(7)
	obj.root.right.left.left = Node(8)
	obj.root.right.left.right = Node(19)
	# Display Tree elements
	obj.level_order()

if __name__ == "__main__": main()

Output

  9  12  3  4  15  6  7  8  19
#   Ruby Program 
#   Level Order Tree Traversal Using Recursion

# Binary Tree Node
class Node 

	# Define the accessor and reader of class Node  
	attr_reader :data, :left, :right
	attr_accessor :data, :left, :right

	def initialize(value)
	
		self.data = value
		self.right = nil
		self.left = nil
	end
end
class BinaryTree 

	# Define the accessor and reader of class BinaryTree  
	attr_reader :root
	attr_accessor :root

	def initialize()
	
		self.root = nil
	end
	# Find height of given binary tree
	def tree_height(root)
	
		if (root != nil)
		
			# Recursively calculating  height of tree
			a = self.tree_height(root.left)
			b = self.tree_height(root.right)
			# returning a height of largest subtree
			if (a > b)
			
				return a + 1
			else
			
				return b + 1
			end
		else
		
			return 0
		end
	end
	# Display particular level from left to right
	def display_level(root, level, counter)
	
		if (root == nil)
		
			return
		end
		if (counter == level)
		
			print(" ", root.data)
			return
		end
		# Recursively display given level of  binary tree
		self.display_level(root.left, level, counter + 1)
		self.display_level(root.right, level, counter + 1)
	end
	def level_order()
	
		# Find find the height of tree
		height = self.tree_height(self.root)
		counter = 1
		# Display tree level from top to bottom left to right
		while (counter <= height)
		
			self.display_level(self.root, counter, 1)
			counter += 1
		end
	end
end
def main()

	obj = BinaryTree.new()
	#  Make A Binary Tree
	#     -------------------
	#                9
	#              /   \
	#             12    3
	#            /     / \
	#           4    15   6
	#          /     / \
	#         7     8   19
	#     
	
	# Insert binary tree nodes
	obj.root = Node.new(9)
	obj.root.left = Node.new(12)
	obj.root.right = Node.new(3)
	obj.root.right.right = Node.new(6)
	obj.root.right.left = Node.new(15)
	obj.root.left.left = Node.new(4)
	obj.root.left.left.left = Node.new(7)
	obj.root.right.left.left = Node.new(8)
	obj.root.right.left.right = Node.new(19)
	# Display Tree elements
	obj.level_order()
end
main()

Output

 9 12 3 4 15 6 7 8 19
/*
  Scala Program 
  Level Order Tree Traversal Using Recursion
*/
//Binary Tree Node
class Node(var data: Int,
	var left: Node,
		var right: Node)
{
	def this(value: Int)
	{
		this(value, null, null);
	}
}
class BinaryTree(var root: Node)
{
	def this()
	{
		this(null);
	}
	//Find height of given binary tree
	def tree_height(root: Node): Int = {
		if (root != null)
		{
			//Recursively calculating  height of tree
			var a: Int = tree_height(root.left);
			var b: Int = tree_height(root.right);
			//returning a height of largest subtree
			if (a > b)
			{
				return a + 1;
			}
			else
			{
				return b + 1;
			}
		}
		else
		{
			return 0;
		}
	}
	//Display particular level from left to right
	def display_level(root: Node, level: Int, counter: Int): Unit = {
		if (root == null)
		{
			return;
		}
		if (counter == level)
		{
			print(" " + root.data);
			return;
		}
		//Recursively display given level of  binary tree
		display_level(root.left, level, counter + 1);
		display_level(root.right, level, counter + 1);
	}
	def level_order(): Unit = {
		//Find find the height of tree
		var height: Int = tree_height(this.root);
		var counter: Int = 1;
		//Display tree level from top to bottom left to right
		while (counter <= height)
		{
			display_level(this.root, counter, 1);
			counter += 1;
		}
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var obj: BinaryTree = new BinaryTree();
		/* Make A Binary Tree
		    -------------------
		               9
		             /   \
		            12    3
		           /     / \
		          4    15   6
		         /     / \
		        7     8   19
		    */
		//Insert binary tree nodes
		obj.root = new Node(9);
		obj.root.left = new Node(12);
		obj.root.right = new Node(3);
		obj.root.right.right = new Node(6);
		obj.root.right.left = new Node(15);
		obj.root.left.left = new Node(4);
		obj.root.left.left.left = new Node(7);
		obj.root.right.left.left = new Node(8);
		obj.root.right.left.right = new Node(19);
		//Display Tree elements
		obj.level_order();
	}
}

Output

 9 12 3 4 15 6 7 8 19
/*
  Swift 4 Program 
  Level Order Tree Traversal Using Recursion
*/
//Binary Tree Node
class Node
{
	var data: Int;
	var left: Node? ;
	var right: Node? ;
	init(_ value: Int)
	{
		self.data = value;
		self.right = nil;
		self.left = nil;
	}
}
class BinaryTree
{
	var root: Node? ;
	init()
	{
		self.root = nil;
	}
	//Find height of given binary tree
	func tree_height(_ root: Node? ) -> Int
	{
		if (root != nil)
		{
			//Recursively calculating  height of tree
			let a: Int = self.tree_height(root!.left);
			let b: Int = self.tree_height(root!.right);
			//returning a height of largest subtree
			if (a > b)
			{
				return a + 1;
			}
			else
			{
				return b + 1;
			}
		}
		else
		{
			return 0;
		}
	}
	//Display particular level from left to right
	func display_level(_ root: Node? , _ level : Int, _ counter: Int)
	{
		if (root == nil)
		{
			return;
		}
		if (counter == level)
		{
			print(" ", root!.data, terminator: "");
			return;
		}
		//Recursively display given level of  binary tree
		self.display_level(root!.left, level, counter + 1);
		self.display_level(root!.right, level, counter + 1);
	}
	func level_order()
	{
		//Find find the height of tree
		let height: Int = self.tree_height(self.root);
		var counter: Int = 1;
		//Display tree level from top to bottom left to right
		while (counter <= height)
		{
			self.display_level(self.root, counter, 1);
			counter += 1;
		}
	}
}
func main()
{
	let obj: BinaryTree = BinaryTree();
	/* Make A Binary Tree
	    -------------------
	               9
	             /   \
	            12    3
	           /     / \
	          4    15   6
	         /     / \
	        7     8   19
	    */
	//Insert binary tree nodes
	obj.root = Node(9);
	obj.root!.left = Node(12);
	obj.root!.right = Node(3);
	obj.root!.right!.right = Node(6);
	obj.root!.right!.left = Node(15);
	obj.root!.left!.left = Node(4);
	obj.root!.left!.left!.left = Node(7);
	obj.root!.right!.left!.left = Node(8);
	obj.root!.right!.left!.right = Node(19);
	//Display Tree elements
	obj.level_order();
}
main();

Output

  9  12  3  4  15  6  7  8  19


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