SPA1 lista(obrni)

MODULE liste;
FROM InOut IMPORT WriteString, WriteLn, ReadInt, WriteInt;
FROM Storage IMPORT ALLOCATE, DEALLOCATE;

TYPE
    pok = POINTER TO Slog;
    Slog = RECORD
              kinf : INTEGER;
              veza : pok
           END;

    ProcTip = PROCEDURE (VAR pok,INTEGER);

VAR
   lista: pok;
   odabir : INTEGER;

PROCEDURE stampaj(VAR lista: pok); FORWARD;
PROCEDURE unisti(VAR lista: pok); FORWARD;
PROCEDURE obrni(VAR lista:pok); FORWARD;


PROCEDURE dodajpocetak(VAR lista: pok;int : INTEGER);
VAR
   temp : pok;
BEGIN
     NEW(temp);
     temp^.kinf := int;
     temp^.veza := lista;
     lista := temp
END dodajpocetak;

PROCEDURE dodajkraj(VAR lista: pok;int: INTEGER);
VAR
   temp, tekuci : pok;
BEGIN
     NEW(temp);
     temp^.kinf := int;
     temp^.veza := NIL;
     IF lista = NIL THEN
       lista := temp
     ELSE
         tekuci := lista;
         WHILE tekuci^.veza <> NIL DO
              tekuci := tekuci^.veza
         END;
         tekuci^.veza := temp
     END
END dodajkraj;

PROCEDURE ucitaj(VAR lista: pok;p: ProcTip);
VAR
   i, n , int : INTEGER;
BEGIN
     WriteString('Unesite n: ');
     ReadInt(n);
     FOR i := 1 TO n DO
        ReadInt(int);
        p(lista,int);
        WriteLn
     END;
     WriteLn;
     WriteString('Stampanje liste: ');
     WriteLn;
     stampaj(lista);
     WriteLn;
END ucitaj;

PROCEDURE stampaj(VAR lista: pok);
VAR
   temp : pok;
BEGIN
     temp := lista;
     WHILE temp <> NIL DO
          WriteInt(temp^.kinf,0);
          WriteLn;
          temp := temp^.veza
     END;
END stampaj;

PROCEDURE unisti(VAR lista: pok);
VAR
   temp : pok;
BEGIN
     temp := lista;
     WHILE lista <> NIL DO
          DISPOSE(temp);
          lista := lista^.veza;
          temp := lista
     END
END unisti;

PROCEDURE demonstrirajobrni(VAR lista: pok);
BEGIN
     WriteString('Pre obrtanja!');
      WriteLn;
       stampaj(lista);
        WriteLn;
     WriteString('Posle obrtanja! ');
      WriteLn;
       obrni(lista);
        stampaj(lista);
END demonstrirajobrni;

PROCEDURE obrni(VAR lista:pok);
VAR
 temp,nova,pred:pok;

BEGIN
     nova := NIL;
     temp := lista;
     pred := NIL;
     WHILE temp # NIL DO
          dodajpocetak(nova,temp^.kinf);
          pred := temp;
          temp := temp^.veza;
          DISPOSE(pred);
     END;
 lista := nova;
END obrni;


BEGIN
     lista := NIL;
     WriteString('Dodaj pocetak ili dodaj kraj, 1/2: ');
     ReadInt(odabir); WriteLn;
     IF odabir = 1 THEN
       ucitaj(lista,dodajpocetak);
     ELSIF odabir = 2 THEN
          ucitaj(lista,dodajkraj);
     ELSE
         WriteString('Pogresan unos! ')
     END;
     demonstrirajobrni(lista);
     unisti(lista);
END liste.