Variablen innerhalb von Klassen

[Socke_SG]

Also ich geb hier mal alles was dazu wichtig ist:

Das hier ist die Klassen-Unit:

Delphi-Quellcode:

unit fusionsreactor;

interface

type TFReactor = class(TObject)
  private
    temperature: extended;
    pressure: extended;
    dbstoff: integer;
    firing: boolean;
  public
    procedure Create;
    function Energyproduction(temp, pres: extended; bs: integer): extended;
    function DeterminePressure(temp: extended; bs: integer): extended;
    function DetermineTemperature(bs: integer; triggerenergy: extended): extended;
    function Lawson(temp, pres: extended): extended;
  end;

implementation

procedure TFReactor.Create;
begin
  temperature := 0.0;
  pressure    := 0.0;
  bstoff      := 0;
  firing      := false;
end;


function TFReactor.energyproduction(temp, pres: extended; bs: integer): extended;
var lawsoncrit: extended;
begin
lawsoncrit:= 1E+20;
  if pres*temp>lawsoncrit then begin
    result:= (1E+17)*deut;
    firing:=true;
  end else
    result:= 0.0;
end;

function TFReactor.DeterminePressure(temp: extended; bs: integer): extended;
var molarvolume, gasconstant: extended;
begin
  gasconstant:=8.314472;  //J/(mol*K)
  molarvolume:= 0.00403*deut/(113.09724);
  result:= gasconstant*temp/gasconstant;
end;

function TFReactor.DetermineTemperature(bs: integer; triggerenergy: extended): extended;
var boltzmann: extended;
begin
  boltzmann:= 1.3806504E-23;
  result:= 2.0*triggerenergy*boltzmann/3.0;
end;

function TFReactor.Lawson(temp,pres: extended): extended;
begin
  result:= temp*pres;
end;

end.

und das hier ist im Hauptprogramm:

Deklaration:

Delphi-Quellcode:

public
...
   Reactor: TFusionReactor;
...

Aufruf:

Delphi-Quellcode:

Reactor.Create
label193.caption:=FloatToStr(Reactor.energyproduction(temp,pres,bstoff));

Die Fehlermeldung ist:
"Zugriffsverletzung bei Adresse 0050573E in Modul 'frtest.exe'. Schreiben von Adresse 00000008"