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Delphi source code for Math >> Validate an IBAN

Category: Math
Title: Validate an IBAN
Date added: 15.03.2006
Hits: 14024

function ChangeAlpha(input: string): string;
  a: Char;
  Result := input;
  for a := 'A' to 'Z' do
    Result := StringReplace(Result, a, IntToStr(Ord(a) - 55), [rfReplaceAll]);

function CalculateDigits(iban: string): Integer;
  v, l: Integer;
  alpha: string;
  number: Longint;
  rest: Integer;
  iban := UpperCase(iban);
  if Pos('IBAN', iban) > 0 then
    Delete(iban, Pos('IBAN', iban), 4);
  iban := iban + Copy(iban, 1, 4);
  Delete(iban, 1, 4);
  iban := ChangeAlpha(iban);
  v := 1;
  l := 9;
  rest := 0;
  alpha := '';
    while v <= Length(iban) do
      if l > Length(iban) then
        l := Length(iban);
      alpha := alpha + Copy(iban, v, l);
      number := StrToInt(alpha);
      rest := number mod 97;
      v := v + l;
      alpha := IntToStr(rest);
      l := 9 - Length(alpha);
    rest := 0;
  Result := rest;

function CheckIBAN(iban: string): Boolean;
  iban := StringReplace(iban, ' ', '', [rfReplaceAll]);
  if CalculateDigits(iban) = 1 then
    Result := True
    Result := False;

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