Sort doubly linked list.

Write a Program to sort the elements of the doubly linked list.

Solution:

using System;

namespace LinkedListOpearation
{
    class Program
    {
        public static void Main()
        {
            var dList = new DoublyLinkedList();
            dList.Add(19);
            dList.Add(82);
            dList.Add(12);
            dList.Add(21);
            dList.Add(43);

            Console.WriteLine("Doubly Linked List: ");
            dList.Print();
            dList.Sort();
            Console.WriteLine("Sorted Doubly Linked List: ");
            dList.Print();
            Console.ReadLine();
        }
    }


    public class DoublyLinkedList
    {
        public int Size;
        public Node Head;
        public Node Tail;

        public void Add(int data)
        {
            var newNode = new Node(data);

            if (Head == null)
            {
                Head = Tail = newNode;
                Head.Previous = null;
                Tail.Next = null;
            }
            else
            {
                Tail.Next = newNode;
                newNode.Previous = Tail;
                Tail = newNode;
                Tail.Next = null;
            }
            Size++;
        }

        public void Sort()
        {
            Node current;

            if (Head == null)
                return;

            for (current = Head; current.Next != null; current = current.Next)
            {
                Node index = null;
                for (index = current.Next; index != null; index = index.Next)
                {
                    if (current.Data <= index.Data) continue;
                    var temp = current.Data;
                    current.Data = index.Data;
                    index.Data = temp;
                }
            }
        }

        public void Print()
        {
            var current = Head;
            if (Head == null)
                return;

            while (current != null)
            {
                Console.WriteLine(current.Data);
                current = current.Next;
            }
        }
    }

    public class Node
    {
        public int Data;
        public Node Next;
        public Node Previous;

        public Node(int data)
        {
            Data = data;
        }
    }
}

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