Question

Using MOD 97 to find out if bankaccount is correct

Asked by: marioway

Hi, I want to find out if the account nummer is correct. Following code worked perfect, but on a certain number, it gave me an exception.
737-0250120-97

DIVISION OF 7370250120 by 97 : rest is 0  --> should I correct the code --> adding if ... is  0 then everything is fine ?

thx
Marioway

procedure TAdminwijzig.MaskEdit2Exit(Sender: TObject);
var Nummer: Int64;
    Rest: Int64;
begin
 if trim(MaskEdit2.Text) = '' then begin
  end
  else
   if Length(Trim(MaskEdit2.Text)) < 12 then begin
     ShowMessage('Verkeerd rekeningnummer. Corrigeer.');
     MaskEdit2.SetFocus;
   end
 else
  begin
   Nummer:= StrToInt64(Leftstr(MaskEdit2.Text, 10));
   Rest:= (Nummer)MOD 97;
    if Rest = StrToInt64(RightStr(MaskEdit2.Text, 2)) then begin
     end
    else
     begin
      ShowMessage('Verkeerd rekeningnummer. Corrigeer.');
      MaskEdit2.SetFocus;
     end;
  end;
end;

                                  
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Asked On
2008-09-09 at 12:18:55ID23716839
Topic

Delphi Database

Participating Experts
1
Points
500
Comments
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Answers

 

by: JosephGloszPosted on 2008-09-09 at 13:01:33ID: 22431601

Well, if you do the division on a calculator, you'll see the mod result is indeed 0. So there is no issue there.

You'll have to check the original computation algorithm to make sure you haven't oversimplified it. Because it find it highly suspect that the condition is good if X mod 97 = Y (where Y is the last 2 digits of the account number), but when Y happens to equal your hard-coded '97' mod divisor then it comes out to exactly zero??

I'll bet the function is more along the lines of
var
  Good: boolean;
begin....etc...
  Divisor := IntToStr(RightStr(MaskEdit2.Text, 2));
  Good := (Nummer MOD Divisor) = 0;

If the above isn't the right way to do it then I don't think you can just accept zero as a good result, unless all the numbers that can be divided by 97 evenly will be good account numbers.

 

by: mariowayPosted on 2008-09-09 at 14:07:43ID: 31494827

Hi Joseph, first thank you for your quick respons; I changed the code so that 0 is also accepted as a good result

thx
Marioway

20120131-EE-VQP-002

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