Add Two Numbers

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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 {

 *     int val;

 *     ListNode next;

 *     ListNode(int x) { val = x; }

 * }

 */

public class Solution {

    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {

       ListNode newLink= new ListNode(0);

       ListNode current=newLink;

       int carry =0;

      while (l1 != null || l2 != null) {

        int a1 = (l1 == null) ? 0 : l1.val;

        int a2 = (l2 == null) ? 0 : l2.val;

        int sum = a1 + a2 + carry;

        carry = sum / 10;

        current.next = new ListNode(sum % 10);

        l1 = (l1 == null) ? null : l1.next;

        l2 = (l2 == null) ? null : l2.next;

        current = current.next;

    }

    if (carry > 0) {

      current.next = new ListNode(carry);

    }

       return newLink.next;

    }

}