[leetcode]_Add Two Numbers

题目：两个链表存储数字，然后求和，和值存储在一个链表中。

代码：

 1 public ListNode addTwoNumbers(ListNode l1, ListNode l2) {

 2         ListNode head = new ListNode(0);

 3         ListNode result = head;

 4

 5         int carry = 0 , tempSum = 0;

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

 7             int v1 , v2;

 8             v1 = (l1 != null) ? l1.val : 0;

 9             v2 = (l2 != null) ? l2.val : 0;

10             tempSum = v1 + v2 + carry;

11             carry = tempSum / 10;

12             tempSum = tempSum % 10;

13             head.next = new ListNode(tempSum);

14             head = head.next;

15

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

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

18         }

19

20         if(carry > 0) head.next = new ListNode(carry);

21

22         return result.next;

23     }

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