Informatik klausur / krytologie

[nailor]

Delphi-Quellcode:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Button1: TButton;
    Label1: TLabel;
    Label2: TLabel;
    procedure Button1Click(Sender: TObject);
    function KickDouble(Old: String): String;
    function BuildKey(Upon_What: String): String;
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  Schlussel: String;

Const Allowed: string = 'abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVXYZ1234567890';

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var i : integer;
begin
Schlussel := edit1.Text;
Schlussel := KickDouble(Schlussel);
Label1.Caption := Schlussel;

Schlussel := BuildKey(Schlussel);
label2.Caption := Schlussel;
end;

function TForm1.KickDouble(Old: String): String;
var i,j: integer;
begin
SetLength(Result,1);
Result[1] := Old[1];
for i := 2 to Length(Old) do
    for j := 1 to Length(Result) do
        if Old[i] = Result[j] then
                    break
        else
        if j = Length(Result) then
            begin
                SetLength(Result,succ(Length(Result)));
                Result[Length(Result)] := Old[i];
            end;
end;

function TForm1.BuildKey(Upon_What: String): String;
var i,j: integer;
begin
Result := KickDouble(Upon_What + Allowed);
end;

end.

Das macht die doppelten weg und den Schlüssel. Nicht so perfekt, aber immerhin!