Decimal to Binary or hex

Program KettesLista;

Uses Crt;

Type Tmutato = ^Lista;
             Lista = Record
                   AdatMezo:Byte;
                   EloreCim:Tmutato;
                   VisszaCim:Tmutato;
             End;

Var A0,A1:Tmutato;
   Sz,SzRe:Word;
         c:Char;

Procedure Befejez;
 Var bf:Byte;
 Begin
  WriteLn;
  For bf:= 0 To 27 Do Write('-');
  WriteLn;
  Write('-= Created by FlamingClaw =-');
  WriteLn;
  For bf:= 0 To 27 Do Write('-');
  WriteLn;
  Write('Kil',#130,'p',#130,'shez nyomj meg egy gombot...');
  Repeat
  Until KeyPressed;

   End;


Procedure Kilep;
 Begin
  WriteLn('Hib',#160,'s adat!');
  Write('Kil',#130,'p',#130,'shez nyomj meg egy gombot...');
  ReadKey;
  Halt;
 End;

Procedure Be1(Var Esz:Word);
 Begin
  ClrScr;
  {$I-}
  Write('K',#130,'rem a Sz',#160,'mot: ');
  ReadLn(Esz);
  {$I+}
  If IoResult <> 0 Then Kilep;
 End;


Procedure Be2(Var Osz:Word);
 Begin
  {$I-}
  Write('Hanyas Sz',#160,'mrendszerbe 2..16 : ');
  ReadLn(Osz);
  If (Osz < 2) Or (Osz > 16) Then Kilep;
  {$I+}
  If IoResult <> 0 Then Kilep;
 End;

Procedure Convert(Conv:Word);
 Var S:String[1];

 Begin
    If (Conv <= 9) And (Conv >= 0) Then
     Begin
      Str(Conv,S);
     End
     Else Begin
           Case (Conv) Of
            10:S:='A';
            11:S:='B';
            12:S:='C';
            13:S:='D';
            14:S:='E';
            15:S:='F';
           End;
    End;
    Write(S);
 End;

Procedure Foglal(Var x,y:Word);
 Begin
  A0:=Nil;
  While (x <> 0) Do
   Begin
    New(A1);
    A1^.AdatMezo:= x Mod y;
    If (A0 = Nil) Then
     Begin
       A0:=A1;
       A0^.VisszaCim:=Nil;
     End
    Else Begin
          A1^.VisszaCim:=A0;
          A0^.EloreCim:=A1;
          A0:=A1;
         End;
    x:= x Div y;
    End;
 End;
Procedure Pusztit;
 Begin
  A1:=A0;
  While A1<>Nil Do
   Begin
    A0:=A1^.VisszaCim;
    Dispose(A1);
    A1:=A0;
   End;
 End;

Procedure Kiolvas;
 Begin
  A1:=A0;
  While (A1 <> Nil) Do
   Begin
    Convert(A1^.AdatMezo);
    A1:=A1^.VisszaCim;
   End;
 End;

Begin
  Repeat
  Be1(Sz);
  Be2(SzRe);
  Foglal(Sz,SzRe);
  Kiolvas;
  Pusztit;
  WriteLn;
  Write('Esc kil‚p‚s!    Folytassuk?');
  c:= ReadKey;
  ClrScr;
  Until c=#27;
  Befejez;
End.