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unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Edit1: TEdit;
procedure Edit1KeyPress(Sender: TObject; var Key: Char);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
type
TnumChar=set of char;
{$R *.dfm}
procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
var
numKey:Tnumchar;
begin
numKey:=['0','1','2','3','4','5','6','7','8','9'];
if not (key in numKey) then
showmessage('not number');
end;
end.
