本文整理自网络，侵删。
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
var
i:integer;
procedure TForm1.Button1Click(Sender: TObject);
begin
i:=9;
if i in [1..7] then //子界表达式
showmessage('i<=7')
else
showmessage('9不在这个子界里面');
end;
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