![]() ![]() My code works, but I wanted to learn about a more efficient and more Pythonic way of doing this. UPDATE December 5, 2013: Test credit card numbers and the link to Paypal were fixed. Ive implemented Luhns algorithm for checking credit card numbers. This code was tested with SAS 9.3 64-bit on Windows 7. This code was executed on 177,172 credit card records and found only 40 invalid numbers. Patrick’s SAS code was very helpful, but without resetting ChkSum, SAS would fail all credit card numbers following an invalid card number. Put 'WARNING: This is a invalid ID: ' acct_nbr= ChkSum= Put 'NOTE: This is a valid ID: ' acct_nbr= ChkSum= Multiply each digit by two and sum the digits if the answer is greater than nine to form partial sums for the even digits 2. Next, tap on the Validate Card Number button to initiate. * Check if ID is valid or not (if ChkSum ends with Zero) */ Enter the credit card number in the field to check its validity. * Luhn algorithm (also called modulus 10 or mod 10) */ĪddIt=put(2*input(substr(ChkStr,pos,1),2.),2.) Invented in 1954 by an engineer at IBM, the Luhn algorithm has since been adopted as a standard by all major credit card issuers, as well as many government IDs, and is specified in ISO/IEC 7812-1. Put 'WARNING: test credit card number: ' acct_nbr= The Luhn algorithm is a simple, public domain checksum algorithm that can be used to validate a variety of identification numbers. * check for known test credit card number accounts */ * to stop processing, uncomment out the delete statement */ Put 'WARNING: Not 15/16 digits: ' acct_nbr= * check length for Visa/Discover/MC/Amex */ The code also validates the credit card number by length and by checking against a short of known test account numbers. The following code demonstrates an implementation in SAS. The MII is the first digit of a credit card number which represents the category of entity who issued the card. Major credit card issuing networks (including Visa, MasterCard, Discover, and American Express) allow simple credit card number validation using the Luhn Algorithm (also called the “modulus 10” or “mod 10” algorithm). We'll verify your number against the Luhn Algorithm to see if it is valid. ![]()
0 Comments
Leave a Reply. |