my-solutions/problems/2-add-two-numbers/lib.c

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2022-11-17 21:13:04 +05:00
#include <stdlib.h>
#include "lib.h"
struct ListNode* addTwoNumbers(struct ListNode* l1, struct ListNode* l2) {
struct ListNode* current = NULL;
struct ListNode* first_node = NULL;
int reminder = 0;
while (l1 != NULL || l2 != NULL || reminder != 0) {
// Read digits
int a = 0;
int b = 0;
if (l1 != NULL)
a = l1->val;
if (l2 != NULL)
b = l2->val;
// Move pointers to the next node
if (l1 != NULL)
l1 = l1->next;
if (l2 != NULL)
l2 = l2->next;
// Calculate the result
int digit = (a + b + reminder) % 10;
reminder = (a + b + reminder) / 10;
// Create the first node
if (current == NULL) {
current = malloc(sizeof(struct ListNode));
first_node = current;
}
// Create regular node
else {
current->next = malloc(sizeof(struct ListNode));
current = current->next;
}
// Save the result
current->val = digit;
current->next = NULL;
}
return first_node;
}