techiedelight.com
Add a single-digit number to a linked list representing a number - Techie Delight
Given a singly linked list whose nodes represents digits of a number, add a single-digit number to it. For example, adding 7 to the linked list 9 -> 9 -> 9 -> 3 -> NULL should result in the linked list 1 -> 0 -> 0 -> 0 -> 0 -> NULL.