LeetCode-2.Add Two Numbers

https://leetcode.com/problems/add-two-numbers/

You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.

Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     public int val;
 *     public ListNode next;
 *     public ListNode(int x) { val = x; }
 * }
 */

public ListNode AddTwoNumbers(ListNode l1, ListNode l2)
    {
        int v;
        ListNode result = new ListNode(0);
        var nextNode = result;
        while (l1 != null || l2 != null)
        {
            v = nextNode.val;
            if (l1 != null)
            {
                v += l1.val;
                l1 = l1.next;
            }
            if (l2 != null)
            {
                v += l2.val;
                l2 = l2.next;
            }
            nextNode.val = v % 10;
            if (l1 != null || l2 != null || v/10!=0)
            {
                nextNode.next = new ListNode(v / 10);
                nextNode = nextNode.next;
            }
        }
        return result;
    }