Create add two numbers

C++/add two numbers

@@ -0,0 +1,57 @@
+// Source : https://oj.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.
+ * struct ListNode {
+ *     int val;
+ *     ListNode *next;
+ *     ListNode(int x) : val(x), next(NULL) {}
+ * };
+ */
+class Solution {
+
+public:
+    ListNode *addTwoNumbers(ListNode *l1, ListNode *l2) {
+        int x=0, y=0, carry=0, sum=0;
+        ListNode *h=NULL, **t=&h;
+
+        while (l1!=NULL || l2!=NULL){
+            x = getValueAndMoveNext(l1);
+            y = getValueAndMoveNext(l2);
+
+            sum = carry + x + y;
+
+            ListNode *node = new ListNode(sum%10);
+            *t = node;
+            t = (&node->next);
+
+            carry = sum/10;
+        }
+
+        if (carry > 0) {
+            ListNode *node = new ListNode(carry%10);
+            *t = node;
+        }
+
+        return h;
+    }
+private:
+    int getValueAndMoveNext(ListNode* &l){
+        int x = 0;
+        if (l != NULL){
+            x = l->val;
+            l = l->next;
+        }
+        return x;
+    }
+};