From: anansi <kazaam@...>
Date: 2007-04-28T22:05:04+09:00
Subject: Re: [QUIZ] Checking Credit Cards (#122)

Christoffer Lern� wrote:
>> James Edward Gray II
> 
> Do we display Valid/Invalid for unknown cards?
>


We desplay unknown for unkown cards :) and valid/invalid for valid or 
invalid cards, the first has nothing to do with the second.

Check first if it's a known one which depends on both the length and the 
  starting bytes.  Then output if it's a known or unknown one.

After that, check the known or unknown number for validation and output 
that result.



> - And by the way: 4012 3456 7890 isn't valid is it? So should that not 
> be "invalid Unknown" or "invalid Visa"?
> 
> /C

That's a unknown and invalid one. To be a Visa one it would need to be 
13 or 15 bytes long.


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