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002_Add_Two_Numbers.java

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/**

* Definition for singly-linked list.

* public class ListNode {

* int val;

* ListNode next;

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

* }

*/

public class Solution {

// example in leetcode book

public ListNode addTwoNumbers(ListNode l1, ListNode l2) {

ListNode dummyHead = new ListNode(0);

ListNode p = l1, q= l2, curr = dummyHead;

int carry = 0;

while (p != null || q!= null) {

int x = (p != null) ? p.val : 0;

int y = (q != null) ? q.val : 0;

int digit = carry + x + y;

carry = digit / 10;

curr.next = new ListNode(digit % 10);

curr = curr.next;

if (p != null) p = p.next;

if (q != null) q = q.next;

}

if (carry > 0) {

curr.next = new ListNode(carry);

}

return dummyHead.next;

}

}