unit Unit1;
interface
uses
Windows, Messages, SysUtils, 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:string;
begin
s:='Abc';
if s[1] in ['A'..'Z'] then
ShowMessage('大写打头')
else ShowMessage('小写打头或者非字母');
{还有一种写法
if 'Abc'[1] in ['A'..'Z'] then
ShowMessage('大写打头')
else ShowMessage('小写打头或者非字母');
{还有一种写法
}
end;
end.