Nullstellen Berechnung für y=ax²+bx+c [Gelößt]

[netmario]

Delphi-Quellcode:

unit Mitternachtsformelberechnung;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, jpeg, ExtCtrls, MPlayer;

type
  TForm1 = class(TForm)
    Image1: TImage;
    Button1: TButton;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    Label6: TLabel;
    Label7: TLabel;
    Label8: TLabel;
    Label12: TLabel;


    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
function plus(a,b,c: Real): Real;
begin
  plus:=(-b+(SQRT(b*b-4*a*c)))/(2*a);
end;
function minus(a,b,c: Real): Real;
begin
  minus:=(-b-(SQRT(b*b-4*a*c)))/(2*a);
end;

procedure TForm1.Button1Click(Sender: TObject);
var a,b,c,d,e: Real;
begin
 Label1.Caption:='';
 Label2.Caption:='';
 a := StrToFloat(Edit1.Text);
 b := StrToFloat(Edit2.Text);
 c := StrToFloat(Edit3.Text);
 if b*b-4*a*c>=0 then
 begin
 d := plus(a,b,c);
 e := minus(a,b,c);
 Label1.Caption := FloatToStr(d);
 Label2.Caption := FloatToStr(e);
 Label12.Caption:='';
 end
 else
 Label12.Caption:='Es gibt keine Nullstellen!';


end;

end.

[edit=mkinzler]Delphi-Tag eingefügt Mfg, mkinzler[/edit]