unit U_InputBoxCoefficient; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ExtCtrls, DB, ADODB; type TfrmInputBoxCoefficient = class(TForm) Panel1: TPanel; Button1: TButton; Conversion: TEdit; RuleConversion: TComboBox; procedure Button1Click(Sender: TObject); private { Private declarations } public FFFIDS: string; { Public declarations } end; var frmInputBoxCoefficient: TfrmInputBoxCoefficient; implementation {$R *.dfm} procedure TfrmInputBoxCoefficient.Button1Click(Sender: TObject); begin if StrToFloatDef(Conversion.Text, 0) = 0 then Conversion.Text := '0'; ModalResult := 1; end; end.