Rosetta Code:Village Pump/Suggest a programming task: Difference between revisions

* Bank Routing Number Validator - all banks haveare assigned one or more 9-digit routing numbers (aka. transit routing number) that are self checking according to this algorithm. from the left, multiply each digit by a corresponding weight (3,7,1,3,7,1,3,7,1) and add all products. if the sum ends in zero, the number is a valid routing number. Try it for 121000248 - it should sum up to 60. Also try it on the 9-digit routing number found at the bottom of your checking account)