Question

DELPHI的全局变量怎么定义

Answer 1

在单元的接口（interface）中定义的变量是全局变量。如下面的变量x：

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  x:real;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
     showmessage(floattostr(x));
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
     x:=1.2;
end;

end.

Answer 2

全局变量怎么定