Addition and Difference in Delphi

Here is a simple program to perform addition and subtraction in Delphi. I used Delphi 7 Enterprise edition in writing this program. 

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Program Listing

unit add_differece;

interface

uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;

type

  TForm1 = class(TForm)

    Label1: TLabel;

    Label2: TLabel;

    Label3: TLabel;

    Label4: TLabel;

    Label5: TLabel;

    Edit1: TEdit;

    Edit2: TEdit;

    Button1: TButton;

    Button2: TButton;

    Button3: TButton;

    Label6: TLabel;

    Label7: TLabel;

    Label8: TLabel;

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure Button3Click(Sender: TObject);

    procedure FormCreate(Sender: TObject);

   

  private

    { Private declarations }

  public

    { Public declarations }

  end;

var

  Form1: TForm1;

implementation

{$R *.dfm}

var a,b : integer;

procedure TForm1.Button1Click(Sender: TObject);

begin

a:= strtoint(edit1.text);

b:= strtoint(edit2.text);

label6.caption := 'The sum of ' + inttostr(a) + ' and ' +inttostr(b) + ' is ' +inttostr(a+b) + '.';

label7.caption := 'The difference of ' + inttostr(a) + ' and ' +inttostr(b) + ' is ' +inttostr(a-b) + '.';

end;

procedure TForm1.Button2Click(Sender: TObject);

begin

edit1.text := '';

edit2.text := '';

label6.caption :='';

label7.caption :='';

edit1.SetFocus;

end;

procedure TForm1.Button3Click(Sender: TObject);

begin

    if MessageDlg('Do you want to quit this program?', mtConfirmation, [mbYes, mbNO], 0) = mrYes then

begin

form1.Close;

end

else

begin

edit1.SetFocus;

end;

end;

procedure TForm1.FormCreate(Sender: TObject);

begin

end;

end.