fahrenheit celsius delphi7

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    fahrenhite: TLabel;
    Label2: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    coversao: TButton;
    procedure coversaoClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  temperatura: real;
  fahrenhitee: real;
  celsius: real;

implementation

{$R *.dfm}

procedure TForm1.coversaoClick(Sender: TObject);
begin
  fahrenhitee:= strtofloat(edit1.Text);
  temperatura:= fahrenhitee -32;
  celsius:=temperatura/1.8;
  Edit2.Text:=floattostr(celsius);
end;

end.