unit1.pas

来自「delphi课程设计的内容,包括源代码,文本的设计,菜单的设计等.」· PAS 代码 · 共 58 行

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Label1: TLabel;
    Edit2: TEdit;
    Label2: TLabel;
    Edit3: TEdit;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    Button1: TButton;
    procedure Edit1Change(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Edit1Change(Sender: TObject);
begin
     setfocus;
end;

procedure TForm1.Button1Click(Sender: TObject);

var
    x,y:real;
begin

      try
       x:=strtofloat(edit1.text);
       y:=strtofloat(edit2.text);
       edit3.text:=floattostr(x+y);
       exit;
      except
        showmessage('Error!');
        beep;
      end;
end;

end.