CONTOH PROGRAM TREE DALAM PASCAL

Program Tree1;

uses crt;

Type

Tree = ^Simpul;

Simpul = Record

Info : char;

Kiri : Tree;

Kanan : Tree;

End;

Function BARU(Hrf : Char) : Tree;

Var Temp : Tree;

Begin

New(Temp);

Temp^.Info := Hrf;

Temp^.Kiri := NIL; Temp^.Kanan := NIL;

BARU := Temp;

End;

Procedure MASUK(Var Pohon : Tree; Hrf : Char);

Begin

If Pohon = NIL Then

Pohon := BARU(Hrf)

Else

Begin

If Pohon^.Info > Hrf then

MASUK(Pohon^.Kiri,Hrf)

Else If Pohon^.Info < Hrf then

MASUK(Pohon^.Kanan,Hrf)

Else

Writeln('Karakter', Hrf, 'Sudah ada di Tree');

End;

End;

Procedure PREORDER(Temp : Tree);

Begin

If Temp <> NIL Then

Begin

Write(Temp^.Info,' ');

PREORDER(Temp^.Kiri);

PREORDER(Temp^.Kanan);

End;

End;

Procedure INORDER(Temp : Tree);

Begin

If Temp <> NIL Then

Begin

INORDER(Temp^.Kiri);

Write(Temp^.Info,' ');

INORDER(Temp^.Kanan);

End;

End;

Procedure POSTORDER(Temp : Tree);

Begin

If Temp <> NIL Then

Begin

POSTORDER(Temp^.Kiri); {Kunjungi cabang kiri}

POSTORDER(Temp^.Kanan); {Kunjungi cabang kanan}

Write(Temp^.Info,' '); {Cetak isi simpul}

End;

End;

var

poon:tree;

Begin

clrscr;

MASUK(poon,'b');

MASUK(poon,'c');

MASUK(poon,'u');

MASUK(poon,'e');

MASUK(poon,'a');

writeln('PERORDER:');

PREORDER(poon);

writeln;

writeln('INORDER:');

INORDER(poon);

writeln;

writeln('POSTORDER:');

POSTORDER(poon);

readln;

end.


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