On 17/02/2017 5:57 PM, Dave Philipsen wrote: > Here's a problem. It's not the credit card digit itself that is being > tested for odd/even. It's the position of the digit. So you need to do > a 'bitb #1' instead of a 'bita #1'. Good catch - thanks! Regards, -- Mark McDougall <http://retroports.blogspot.com.au>