Addition of Three Numbers in Delphi

A very simple program to ask the user to give three numbers and then the program will sum the values of three numbers and display the results on the screen using Delphi programming language.

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Sample Program Output

Program Listing

add_three_numbers.pas

unit add_three;

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;

    Edit3: TEdit;

    Label6: TLabel;

    Edit4: TEdit;

    Button1: TButton;

    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;

  Var a,b,c : integer;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);

begin

a:= strtoint(edit1.text);

b:= strtoint(edit2.text);

c:= strtoint(edit3.text);

edit4.text := inttostr(a+b+c);

end;

procedure TForm1.Button2Click(Sender: TObject);

begin

edit1.text := '';

edit2.text := '';

edit3.text := '';

edit4.text := '';

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;

end.