Delphi Leftstr,Rightstr函数应用

需要引用strUtils

unit Unit1;

interface

uses
??Windows,StrUtils,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}

procedure TForm1.Button1Click(Sender: TObject);
var
??s,s1,s2: string;
begin
??s:='0001000200030004';
??s1:= LeftStr(s,4);
??s2:= RightStr(s,4);
??ShowMessage('s1 leftstr'+ s1 + '???'+ ' s2 rightstr' + s2);
end;

?

结果显示