more readable code

Author: jakwings

src/addTwoNumbers/addTwoNumbers.cpp

@@ -25,35 +25,35 @@ class Solution {
 
 public:
     ListNode *addTwoNumbers(ListNode *l1, ListNode *l2) {
-        int x=0, y=0, z=0;
+        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);
+            x = getValueAndMoveNext(l1);
+            y = getValueAndMoveNext(l2);
 
-            z = z + x + y;
+            sum = carry + x + y;
 
-            ListNode *node = new ListNode(z%10);
+            ListNode *node = new ListNode(sum%10);
             *t = node;
             t = (&node->next);
 
-            z = z/10;
+            carry = sum/10;
         }
 
-        if (z > 0) {
-            ListNode *node = new ListNode(z%10);
+        if (carry > 0) {
+            ListNode *node = new ListNode(carry%10);
             *t = node;
         }
 
         return h;
     }
 private:
-    int getValueAndMoveNext(ListNode** l){
+    int getValueAndMoveNext(ListNode* &l){
         int x = 0;
-        if ( (*l) != NULL){
-            x = (*l)->val;
-            (*l) = (*l)->next;
+        if (l != NULL){
+            x = l->val;
+            l = l->next;
         }
         return x;
     }