Implementation of Luhn algorithm on C
It's not well designed. I wrote it for a task in edX course.
For the details of the Algorithm refer to http://en.wikipedia.org/wiki/Luhn_algorithm Sample card numbers can be found here: https://www.paypalobjects.com/en_US/vhelp/paypalmanager_help/credit_card_numbers.htm