Addition of Two Numbers in Delphi

 A simple program that I wrote using Borland Delphi to ask the user to give two numbers and then the program will compute the sum of two numbers and display the results in the screen.

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Program Listing

unit Addition;

interface

uses

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

  Dialogs, StdCtrls;

type

  TForm1 = class(TForm)

    Button1: TButton;

    Label1: TLabel;

    Label2: TLabel;

    Label3: TLabel;

    Edit1: TEdit;

    Edit2: TEdit;

    Label4: TLabel;

    Button2: TButton;

    Button3: TButton;

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure Button3Click(Sender: TObject);

  private

    { Private declarations }

  public

    { Public declarations }

  end;

var

  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);

begin

  if MessageDlg('Do you really want to quit?', mtConfirmation,

      [mbYes, mbNo], 0) = mrYes then

    Close

  else

    form1.show;

end;

procedure TForm1.Button2Click(Sender: TObject);

var a,b : integer;

    x,y,sum : string;

begin

    x := edit1.Text;

    y := edit2.Text;

    a := StrToInt(x);

    b := StrToInt(y);

    sum := IntToStr(a+b);

    label4.caption := 'The sum of ' +x + ' and '

                + y + ' is ' + sum + '.';

end;

procedure TForm1.Button3Click(Sender: TObject);

begin

   edit1.Text := '';

   edit2.Text  := '';

   label4.caption :='';

   edit1.SetFocus;

end;

end.