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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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.