Area of Rectangle in Delphi

Here is a sample program that I wrote using Delphi as my programming language that will compute the area of the rectangle. The code is very short and easy to understand.

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Sample Program Output

Program Listing

rectangle.pas

unit rectangle;

interface

uses

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

  Dialogs, StdCtrls;

type

  TForm1 = class(TForm)

    Label1: TLabel;

    Label2: TLabel;

    Label3: TLabel;

    Edit1: TEdit;

    Edit2: TEdit;

    Label4: TLabel;

    Button1: TButton;

    Button2: TButton;

    Label5: TLabel;

    Label6: TLabel;

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

  private

    { Private declarations }

  public

    { Public declarations }

  end;

var

  Form1: TForm1;

implementation

{$R *.dfm}

  Var length : integer;

  Var    breadth : integer;

  Var   compute_all : integer;

procedure TForm1.Button1Click(Sender: TObject);

begin

      length := StrToInt(Edit1.Text);

      breadth := StrToInt(Edit2.Text);

      compute_all := (length * breadth);

      label4.Caption :=  'The Area of the Rectangle is '

            + IntToStr(compute_all) + '.';

end;

procedure TForm1.Button2Click(Sender: TObject);

begin

Edit1.Text     := '';

Edit2.Text     := '';

Label4.Caption :='';

Edit1.Setfocus;

end;

end.