Fri 12-03-1993 11:57:12
                                          
                                 Version 1.0
       
       CREDITCD.COM will  check to  see if  the credit card number you
       enter is  a -VALID-  NUMBER. It is a simple program that I made
       because I  am curious  about how a computer calculates numbers;
       especially "CheckSum" numbers.
       
       A "CheckSum"  is the  sum of  the number  values of  a group of
       characters (sic)  or the  sum of  ALL the characters in a file.
       CREDITCD.COM performs a CheckSum of the numbers that you enter.
       Runs a little clever algorithm (which I found on CompuServe) to
       deduce if  the numbers  you entered  can be a valid number used
       (apparently) by ALL American credit card companies.
       
       CREDITCD.COM is  the compiled version of the QuickBASIC program
       contained in  CREDITCD.BAS. It  was compiled  using  Crescent's
       Software's PDQ program to make it tiny. CREDITCD.BAS is NOT  in
       this file set. If you can't find it on CompuServe, "call" me.
       
       I am  tired.... Normally  at this  point I  spend the next one-
       thousand (1,000)  words or so doing a stem-winding dissertation
       on some  unrelated topic. But, not today.... So you are on your
       own this time.
       
       I'm even  too tired  to  take  a  passing  slap  at  the  legal
       profession and  the lawyers who will use this little honey of a
       program and then complain that it doesn't work for credit cards
       issued in Bangladesh.
       
       If you  like the  program, tell  me, if you find an error, tell
       me; and  if you are a lawyer.... well your parents have my most
       sincere and apoplectic condolences.
       
       John De Palma on CompuServe 76076,571