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Delete a linked list using recursion

Here given code implementation process.

// C program for 
// Delete a linked list using recursion  
#include <stdio.h>

#include <stdlib.h>

// Linked List LinkNode
struct LinkNode
{
	int data;
	struct LinkNode *next;
};
// Singly linked list 
struct SingleLL
{
	struct LinkNode *head;
	struct LinkNode *tail;
};
// Returns the new linked list
struct SingleLL *newLinkedList()
{
	// Create memory of head and tail Nodes
	struct SingleLL *sll = (struct SingleLL *) malloc(sizeof(struct SingleLL));
	if (sll == NULL)
	{
		printf("Memory overflow\n");
	}
	else
	{
		sll->head = NULL;
		sll->tail = NULL;
	}
	return sll;
}
// Add new Node at end of linked list 
void appendNode(struct SingleLL *sll, struct LinkNode *node)
{
	if (sll->head == NULL)
	{
		sll->head = node;
	}
	else
	{
		// Append the node at last position
		sll->tail->next = node;
	}
	sll->tail = node;
}
// Handles the request of adding new node in linked list
void addNode(struct SingleLL *sll, int data)
{
	// Create dynamic node
	struct LinkNode *node = (struct LinkNode *) malloc(sizeof(struct LinkNode));
	if (node == NULL)
	{
		printf("Memory overflow to Create LinkNode\n");
		return;
	}
	else
	{
		// Set initial node value
		node->data = data;
		node->next = NULL;
	}
	appendNode(sll, node);
}
// Display linked list element
void display(struct SingleLL *sll)
{
	if (sll->head == NULL)
	{
		printf("\n Empty linked list\n");
		return;
	}
	struct LinkNode *temp = sll->head;
	// iterating linked list elements
	while (temp != NULL)
	{
		printf(" %d →", temp->data);
		// Visit to next node
		temp = temp->next;
	}
	printf(" NULL\n");
}
// Recursively, delete nodes in given linked list 
struct LinkNode *deleteElement(struct LinkNode *node)
{
	if (node != NULL)
	{
		struct LinkNode *temp = node->next;
		if (temp != NULL)
		{
			// Unlink next node
			node->next = deleteElement(temp);
		}
		// Free node
		free(node);
	}
	return NULL;
}
// This is handle the request of remove linked list elements
void deleteList(struct SingleLL *sll)
{
	if (sll->head != NULL)
	{
		// new tail node is null
		sll->tail = NULL;
		// new head is null
		sll->head = deleteElement(sll->head);
	}
}
int main(int argc, char const *argv[])
{
	struct SingleLL *sll = newLinkedList();
	// Linked list
	//  1 → 2 → 3 → 4 → 5 → NULL
	addNode(sll, 1);
	addNode(sll, 2);
	addNode(sll, 3);
	addNode(sll, 4);
	addNode(sll, 5);
	printf(" Before Delete \n");
	display(sll);
	// Remove all nodes
	deleteList(sll);
	printf("\n After Delete ");
	display(sll);
	return 0;
}

input

 Before Delete
 1 → 2 → 3 → 4 → 5 → NULL

 After Delete
 Empty linked list
/*
  Java Program for
  Delete a linked list using recursion
*/
// Linked list node
class LinkNode
{
	public int data;
	public LinkNode next;
	public LinkNode(int data)
	{
		this.data = data;
		this.next = null;
	}
}
public class SingleLL
{
	public LinkNode head;
	public LinkNode tail;
	public SingleLL()
	{
		this.head = null;
		this.tail = null;
	}
	// Add new Node at end of linked list 
	public void addNode(int data)
	{
		LinkNode node = new LinkNode(data);
		if (this.head == null)
		{
			this.head = node;
		}
		else
		{
			// Append the node at last position
			this.tail.next = node;
		}
		this.tail = node;
	}
	// Display linked list element
	public void display()
	{
		if (this.head == null)
		{
			System.out.println("\n Empty linked list");
			return;
		}
		LinkNode temp = this.head;
		//iterating linked list elements
		while (temp != null)
		{
			System.out.print(" " + temp.data + " →");
			// Visit to next node
			temp = temp.next;
		}
		System.out.println(" NULL");
	}
	// Recursively, delete nodes in given linked list 
	public LinkNode deleteElement(LinkNode node)
	{
		if (node != null)
		{
			LinkNode temp = node.next;
			if (temp != null)
			{
				// Unlink next node
				node.next = deleteElement(temp);
			}
		}
		return null;
	}
	// This is handle the request of remove linked list elements
	public void deleteList()
	{
		if (this.head != null)
		{
			// new tail node is null
			this.tail = null;
			// new head is null
			this.head = deleteElement(this.head);
		}
	}
	public static void main(String[] args)
	{
		SingleLL sll = new SingleLL();
		// Linked list
		//  1 → 2 → 3 → 4 → 5 → NULL
		sll.addNode(1);
		sll.addNode(2);
		sll.addNode(3);
		sll.addNode(4);
		sll.addNode(5);
		System.out.print(" Before Delete \n");
		sll.display();
		// Remove all nodes
		sll.deleteList();
		System.out.print("\n After Delete ");
		sll.display();
	}
}

input

 Before Delete
 1 → 2 → 3 → 4 → 5 → NULL

 After Delete
 Empty linked list
// Include header file
#include <iostream>

using namespace std;
/*
  C++ Program for
  Delete a linked list using recursion
*/
// Linked list node
class LinkNode
{
	public: int data;
	LinkNode *next;
	LinkNode(int data)
	{
		this->data = data;
		this->next = NULL;
	}
};
class SingleLL
{
	public: LinkNode *head;
	LinkNode *tail;
	SingleLL()
	{
		this->head = NULL;
		this->tail = NULL;
	}
	// Add new Node at end of linked list 
	void addNode(int data)
	{
		LinkNode *node = new LinkNode(data);
		if (this->head == NULL)
		{
			this->head = node;
		}
		else
		{
			// Append the node at last position
			this->tail->next = node;
		}
		this->tail = node;
	}
	// Display linked list element
	void display()
	{
		if (this->head == NULL)
		{
			cout << "\n Empty linked list" << endl;
			return;
		}
		LinkNode *temp = this->head;
		//iterating linked list elements
		while (temp != NULL)
		{
			cout << " " << temp->data << " →";
			// Visit to next node
			temp = temp->next;
		}
		cout << " NULL" << endl;
	}
	// Recursively, delete nodes in given linked list 
	LinkNode *deleteElement(LinkNode *node)
	{
		if (node != NULL)
		{
			LinkNode *temp = node->next;
			if (temp != NULL)
			{
				// Unlink next node
				node->next = this->deleteElement(temp);
			}
          	// remove node
          	delete node;
		}
		return NULL;
	}
	// This is handle the request of remove linked list elements
	void deleteList()
	{
		if (this->head != NULL)
		{
			// new tail node is null
			this->tail = NULL;
			// new head is null
			this->head = this->deleteElement(this->head);
		}
	}
};
int main()
{
	SingleLL *sll = new SingleLL();
	// Linked list
	//  1 → 2 → 3 → 4 → 5 → NULL
	sll->addNode(1);
	sll->addNode(2);
	sll->addNode(3);
	sll->addNode(4);
	sll->addNode(5);
	cout << " Before Delete \n";
	sll->display();
	// Remove all nodes
	sll->deleteList();
	cout << "\n After Delete ";
	sll->display();
	return 0;
}

input

 Before Delete
 1 → 2 → 3 → 4 → 5 → NULL

 After Delete
 Empty linked list
// Include namespace system
using System;
/*
  Csharp Program for
  Delete a linked list using recursion
*/
// Linked list node
public class LinkNode
{
	public int data;
	public LinkNode next;
	public LinkNode(int data)
	{
		this.data = data;
		this.next = null;
	}
}
public class SingleLL
{
	public LinkNode head;
	public LinkNode tail;
	public SingleLL()
	{
		this.head = null;
		this.tail = null;
	}
	// Add new Node at end of linked list 
	public void addNode(int data)
	{
		LinkNode node = new LinkNode(data);
		if (this.head == null)
		{
			this.head = node;
		}
		else
		{
			// Append the node at last position
			this.tail.next = node;
		}
		this.tail = node;
	}
	// Display linked list element
	public void display()
	{
		if (this.head == null)
		{
			Console.WriteLine("\n Empty linked list");
			return;
		}
		LinkNode temp = this.head;
		//iterating linked list elements
		while (temp != null)
		{
			Console.Write(" " + temp.data + " →");
			// Visit to next node
			temp = temp.next;
		}
		Console.WriteLine(" NULL");
	}
	// Recursively, delete nodes in given linked list 
	public LinkNode deleteElement(LinkNode node)
	{
		if (node != null)
		{
			LinkNode temp = node.next;
			if (temp != null)
			{
				// Unlink next node
				node.next = this.deleteElement(temp);
			}
		}
		return null;
	}
	// This is handle the request of remove linked list elements
	public void deleteList()
	{
		if (this.head != null)
		{
			// new tail node is null
			this.tail = null;
			// new head is null
			this.head = this.deleteElement(this.head);
		}
	}
	public static void Main(String[] args)
	{
		SingleLL sll = new SingleLL();
		// Linked list
		//  1 → 2 → 3 → 4 → 5 → NULL
		sll.addNode(1);
		sll.addNode(2);
		sll.addNode(3);
		sll.addNode(4);
		sll.addNode(5);
		Console.Write(" Before Delete \n");
		sll.display();
		// Remove all nodes
		sll.deleteList();
		Console.Write("\n After Delete ");
		sll.display();
	}
}

input

 Before Delete
 1 → 2 → 3 → 4 → 5 → NULL

 After Delete
 Empty linked list
<?php
/*
  Php Program for
  Delete a linked list using recursion
*/
// Linked list node
class LinkNode
{
	public $data;
	public $next;
	public	function __construct($data)
	{
		$this->data = $data;
		$this->next = NULL;
	}
}
class SingleLL
{
	public $head;
	public $tail;
	public	function __construct()
	{
		$this->head = NULL;
		$this->tail = NULL;
	}
	// Add new Node at end of linked list 
	public	function addNode($data)
	{
		$node = new LinkNode($data);
		if ($this->head == NULL)
		{
			$this->head = $node;
		}
		else
		{
			// Append the node at last position
			$this->tail->next = $node;
		}
		$this->tail = $node;
	}
	// Display linked list element
	public	function display()
	{
		if ($this->head == NULL)
		{
			echo "\n Empty linked list".
			"\n";
			return;
		}
		$temp = $this->head;
		//iterating linked list elements
		while ($temp != NULL)
		{
			echo " ".$temp->data." →";
			// Visit to next node
			$temp = $temp->next;
		}
		echo " NULL\n";
	}
	// Recursively, delete nodes in given linked list 
	public	function deleteElement($node)
	{
		if ($node != NULL)
		{
			$temp = $node->next;
			if ($temp != NULL)
			{
				// Unlink next node
				$node->next = $this->deleteElement($temp);
			}
		}
		return NULL;
	}
	// This is handle the request of remove linked list elements
	public	function deleteList()
	{
		if ($this->head != NULL)
		{
			// new tail node is null
			$this->tail = NULL;
			// new head is null
			$this->head = $this->deleteElement($this->head);
		}
	}
}

function main()
{
	$sll = new SingleLL();
	// Linked list
	//  1 → 2 → 3 → 4 → 5 → NULL
	$sll->addNode(1);
	$sll->addNode(2);
	$sll->addNode(3);
	$sll->addNode(4);
	$sll->addNode(5);
	echo " Before Delete \n";
	$sll->display();
	// Remove all nodes
	$sll->deleteList();
	echo "\n After Delete ";
	$sll->display();
}
main();

input

 Before Delete
 1 → 2 → 3 → 4 → 5 → NULL

 After Delete
 Empty linked list
/*
  Node JS Program for
  Delete a linked list using recursion
*/
// Linked list node
class LinkNode
{
	constructor(data)
	{
		this.data = data;
		this.next = null;
	}
}
class SingleLL
{
	constructor()
	{
		this.head = null;
		this.tail = null;
	}
	// Add new Node at end of linked list 
	addNode(data)
	{
		var node = new LinkNode(data);
		if (this.head == null)
		{
			this.head = node;
		}
		else
		{
			// Append the node at last position
			this.tail.next = node;
		}
		this.tail = node;
	}
	// Display linked list element
	display()
	{
		if (this.head == null)
		{
			console.log("\n Empty linked list");
			return;
		}
		var temp = this.head;
		//iterating linked list elements
		while (temp != null)
		{
			process.stdout.write(" " + temp.data + " →");
			// Visit to next node
			temp = temp.next;
		}
		console.log(" NULL");
	}
	// Recursively, delete nodes in given linked list 
	deleteElement(node)
	{
		if (node != null)
		{
			var temp = node.next;
			if (temp != null)
			{
				// Unlink next node
				node.next = this.deleteElement(temp);
			}
		}
		return null;
	}
	// This is handle the request of remove linked list elements
	deleteList()
	{
		if (this.head != null)
		{
			// new tail node is null
			this.tail = null;
			// new head is null
			this.head = this.deleteElement(this.head);
		}
	}
}

function main()
{
	var sll = new SingleLL();
	// Linked list
	//  1 → 2 → 3 → 4 → 5 → NULL
	sll.addNode(1);
	sll.addNode(2);
	sll.addNode(3);
	sll.addNode(4);
	sll.addNode(5);
	process.stdout.write(" Before Delete \n");
	sll.display();
	// Remove all nodes
	sll.deleteList();
	process.stdout.write("\n After Delete ");
	sll.display();
}
main();

input

 Before Delete
 1 → 2 → 3 → 4 → 5 → NULL

 After Delete
 Empty linked list
#  Python 3 Program for
#  Delete a linked list using recursion

#  Linked list node
class LinkNode :
	def __init__(self, data) :
		self.data = data
		self.next = None
	

class SingleLL :
	def __init__(self) :
		self.head = None
		self.tail = None
	
	#  Add new Node at end of linked list 
	def addNode(self, data) :
		node = LinkNode(data)
		if (self.head == None) :
			self.head = node
		else :
			#  Append the node at last position
			self.tail.next = node
		
		self.tail = node
	
	#  Display linked list element
	def display(self) :
		if (self.head == None) :
			print("\n Empty linked list")
			return
		
		temp = self.head
		# iterating linked list elements
		while (temp != None) :
			print("", temp.data ,"→", end = "")
			#  Visit to next node
			temp = temp.next
		
		print(" NULL")
	
	#  Recursively, delete nodes in given linked list 
	def deleteElement(self, node) :
		if (node != None) :
			temp = node.next
			if (temp != None) :
				#  Unlink next node
				node.next = self.deleteElement(temp)
			
		
		return None
	
	#  This is handle the request of remove linked list elements
	def deleteList(self) :
		if (self.head != None) :
			#  new tail node is null
			self.tail = None
			#  new head is null
			self.head = self.deleteElement(self.head)
		
	

def main() :
	sll = SingleLL()
	#  Linked list
	#   1 → 2 → 3 → 4 → 5 → NULL
	sll.addNode(1)
	sll.addNode(2)
	sll.addNode(3)
	sll.addNode(4)
	sll.addNode(5)
	print(" Before Delete ")
	sll.display()
	#  Remove all nodes
	sll.deleteList()
	print("\n After Delete ", end = "")
	sll.display()

if __name__ == "__main__": main()

input

 Before Delete
 1 → 2 → 3 → 4 → 5 → NULL

 After Delete
 Empty linked list
#  Ruby Program for
#  Delete a linked list using recursion

#  Linked list node
class LinkNode 
	# Define the accessor and reader of class LinkNode
	attr_reader :data, :next
	attr_accessor :data, :next
	def initialize(data) 
		self.data = data
		self.next = nil
	end
end

class SingleLL 
	# Define the accessor and reader of class SingleLL
	attr_reader :head, :tail
	attr_accessor :head, :tail
	def initialize() 
		self.head = nil
		self.tail = nil
	end

	#  Add new Node at end of linked list 
	def addNode(data) 
		node = LinkNode.new(data)
		if (self.head == nil) 
			self.head = node
		else 
			#  Append the node at last position
			self.tail.next = node
		end

		self.tail = node
	end

	#  Display linked list element
	def display() 
		if (self.head == nil) 
			print("\n Empty linked list", "\n")
			return
		end

		temp = self.head
		# iterating linked list elements
		while (temp != nil) 
			print(" ", temp.data ," →")
			#  Visit to next node
			temp = temp.next
		end

		print(" NULL", "\n")
	end

	#  Recursively, delete nodes in given linked list 
	def deleteElement(node) 
		if (node != nil) 
			temp = node.next
			if (temp != nil) 
				#  Unlink next node
				node.next = self.deleteElement(temp)
			end

		end

		return nil
	end

	#  This is handle the request of remove linked list elements
	def deleteList() 
		if (self.head != nil) 
			#  new tail node is null
			self.tail = nil
			#  new head is null
			self.head = self.deleteElement(self.head)
		end

	end

end

def main() 
	sll = SingleLL.new()
	#  Linked list
	#   1 → 2 → 3 → 4 → 5 → NULL
	sll.addNode(1)
	sll.addNode(2)
	sll.addNode(3)
	sll.addNode(4)
	sll.addNode(5)
	print(" Before Delete \n")
	sll.display()
	#  Remove all nodes
	sll.deleteList()
	print("\n After Delete ")
	sll.display()
end

main()

input

 Before Delete 
 1 → 2 → 3 → 4 → 5 → NULL

 After Delete 
 Empty linked list

/*
  Scala Program for
  Delete a linked list using recursion
*/
// Linked list node
class LinkNode(var data: Int , var next: LinkNode)
{
	def this(data: Int)
	{
		this(data,null);
	}
}
class SingleLL(var head: LinkNode , var tail: LinkNode)
{
	def this()
	{
		this(null,null);
	}
	// Add new Node at end of linked list 
	def addNode(data: Int): Unit = {
		var node: LinkNode = new LinkNode(data);
		if (this.head == null)
		{
			this.head = node;
		}
		else
		{
			// Append the node at last position
			this.tail.next = node;
		}
		this.tail = node;
	}
	// Display linked list element
	def display(): Unit = {
		if (this.head == null)
		{
			println("\n Empty linked list");
			return;
		}
		var temp: LinkNode = this.head;
		//iterating linked list elements
		while (temp != null)
		{
			print(" " + temp.data + " →");
			// Visit to next node
			temp = temp.next;
		}
		println(" NULL");
	}
	// Recursively, delete nodes in given linked list 
	def deleteElement(node: LinkNode): LinkNode = {
		if (node != null)
		{
			var temp: LinkNode = node.next;
			if (temp != null)
			{
				// Unlink next node
				node.next = deleteElement(temp);
			}
		}
		return null;
	}
	// This is handle the request of remove linked list elements
	def deleteList(): Unit = {
		if (this.head != null)
		{
			// new tail node is null
			this.tail = null;
			// new head is null
			this.head = deleteElement(this.head);
		}
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var sll: SingleLL = new SingleLL();
		// Linked list
		//  1 → 2 → 3 → 4 → 5 → NULL
		sll.addNode(1);
		sll.addNode(2);
		sll.addNode(3);
		sll.addNode(4);
		sll.addNode(5);
		print(" Before Delete \n");
		sll.display();
		// Remove all nodes
		sll.deleteList();
		print("\n After Delete ");
		sll.display();
	}
}

input

 Before Delete
 1 → 2 → 3 → 4 → 5 → NULL

 After Delete
 Empty linked list
/*
  Swift 4 Program for
  Delete a linked list using recursion
*/
// Linked list node
class LinkNode
{
	var data: Int;
	var next: LinkNode? ;
	init(_ data: Int)
	{
		self.data = data;
		self.next = nil;
	}
}
class SingleLL
{
	var head: LinkNode? ;
	var tail: LinkNode? ;
	init()
	{
		self.head = nil;
		self.tail = nil;
	}
	// Add new Node at end of linked list 
	func addNode(_ data: Int)
	{
		let node: LinkNode = LinkNode(data);
		if (self.head == nil)
		{
			self.head = node;
		}
		else
		{
			// Append the node at last position
			self.tail!.next = node;
		}
		self.tail = node;
	}
	// Display linked list element
	func display()
	{
		if (self.head == nil)
		{
			print("\n Empty linked list");
			return;
		}
		var temp: LinkNode? = self.head;
		//iterating linked list elements
		while (temp  != nil)
		{
			print("", temp!.data ,"→", terminator: "");
			// Visit to next node
			temp = temp!.next;
		}
		print(" NULL");
	}
	// Recursively, delete nodes in given linked list 
	func deleteElement(_ node: LinkNode? )->LinkNode?
	{
		if (node  != nil)
		{
			let temp: LinkNode? = node!.next;
			if (temp  != nil)
			{
				// Unlink next node
				node!.next = self.deleteElement(temp);
			}
		}
		return nil;
	}
	// This is handle the request of remove linked list elements
	func deleteList()
	{
		if (self.head  != nil)
		{
			// new tail node is null
			self.tail = nil;
			// new head is null
			self.head = self.deleteElement(self.head);
		}
	}
}
func main()
{
	let sll: SingleLL = SingleLL();
	// Linked list
	//  1 → 2 → 3 → 4 → 5 → NULL
	sll.addNode(1);
	sll.addNode(2);
	sll.addNode(3);
	sll.addNode(4);
	sll.addNode(5);
	print(" Before Delete ");
	sll.display();
	// Remove all nodes
	sll.deleteList();
	print("\n After Delete ", terminator: "");
	sll.display();
}
main();

input

 Before Delete
 1 → 2 → 3 → 4 → 5 → NULL

 After Delete
 Empty linked list
/*
  Kotlin Program for
  Delete a linked list using recursion
*/
// Linked list node
class LinkNode
{
	var data: Int;
	var next: LinkNode ? ;
	constructor(data: Int)
	{
		this.data = data;
		this.next = null;
	}
}
class SingleLL
{
	var head: LinkNode ? ;
	var tail: LinkNode ? ;
	constructor()
	{
		this.head = null;
		this.tail = null;
	}
	// Add new Node at end of linked list 
	fun addNode(data: Int): Unit
	{
		val node: LinkNode = LinkNode(data);
		if (this.head == null)
		{
			this.head = node;
		}
		else
		{
			// Append the node at last position
			this.tail?.next = node;
		}
		this.tail = node;
	}
	// Display linked list element
	fun display(): Unit
	{
		if (this.head == null)
		{
			println("\n Empty linked list");
			return;
		}
		var temp: LinkNode ? = this.head;
		while (temp != null)
		{
			print(" " + temp.data + " →");
			// Visit to next node
			temp = temp.next;
		}
		println(" NULL");
	}
	// Recursively, delete nodes in given linked list 
	fun deleteElement(node: LinkNode ? ): LinkNode ?
	{
		if (node != null)
		{
			val temp: LinkNode? = node.next;
			if (temp != null)
			{
				// Unlink next node
				node.next = this.deleteElement(temp);
			}
		}
		return null;
	}
	// This is handle the request of remove linked list elements
	fun deleteList(): Unit
	{
		if (this.head != null)
		{
			// new tail node is null
			this.tail = null;
			// new head is null
			this.head = this.deleteElement(this.head);
		}
	}
}
fun main(args: Array < String > ): Unit
{
	val sll: SingleLL = SingleLL();
	// Linked list
	//  1 → 2 → 3 → 4 → 5 → NULL
	sll.addNode(1);
	sll.addNode(2);
	sll.addNode(3);
	sll.addNode(4);
	sll.addNode(5);
	print(" Before Delete \n");
	sll.display();
	// Remove all nodes
	sll.deleteList();
	print("\n After Delete ");
	sll.display();
}

input

 Before Delete
 1 → 2 → 3 → 4 → 5 → NULL

 After Delete
 Empty linked list
Last updated on by Kalkicode




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