Combinações 2x2 em POO

program COMB2P;
{ TURBO PASCAL 7 SOURCE
  DELPHI SOURCE
  Calculo de combinacoes de MAX elementos 2x2 em POO
  Joao Paulo Schwarz Schuler}
{FPC Source Code}

{$X+}
{$F+}
type TOnCalcEvent = procedure (X,Y:longint);

type TCombinacao = object
                   private
                   MAXIMO:longint;
                   OnCalc:TOnCalcEvent;

                   public
                   constructor Init(POnCalcEvent:TOnCalcEvent;PMAX:longint);
                   procedure Run;
                   destructor Done;
                   end;

constructor TCombinacao.Init(POnCalcEvent:TOnCalcEvent;PMAX:longint);
begin
OnCalc:=POnCalcEvent;
MAXIMO:=PMAX;
end;

procedure TCombinacao.Run;
var X,Y:integer;
begin
for X:=1 to MAXIMO do
    for Y:=succ(X) {X+1} to MAXIMO
        do OnCalc(X,Y);
end;

destructor TCombinacao.Done;
begin
end;


const MAX = 5; { experimente outros valores}

procedure Imprime(X,Y:longint);
begin
writeln('(',X,',',Y,')');
end;

var C:TCombinacao;
begin
C.Init(Imprime,MAX);
C.Run;
C.Done;
end.