Area of the Circle Solver in Delphi

A program that I wrote using Delphi that will ask the user to give the radius of the circle and then our program will compute for it's area. The code is very easy to understand and use. I intended my work for those that are beginners in Delphi programming.

Add me at Facebook my address is jakerpomperada@gmail.com and jakerpomperada@yahoo.com.
 
My mobile number here in the Philippines is 09173084360.

Sample Program Output

Program Listing

area.pas

unit area;

interface

uses

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

  StdCtrls;

type

  TForm1 = class(TForm)

    Label1: TLabel;

    Label2: TLabel;

    Label3: TLabel;

    Edit1: 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}

const

Pi = 3.1416;

Var

  Radius : Integer;

  Area_Circle   : Real;

  procedure TForm1.Button1Click(Sender: TObject);

begin

Radius := strtoint(Edit1.text);

Area_Circle   :=  (Pi * Radius * Radius);

Label4.Caption := 'The area of the circle is ' + FormatFloat('0.00',Area_Circle);

end;

procedure TForm1.Button2Click(Sender: TObject);

begin

Edit1.Text := '';

Label4.Caption := '';

Edit1.Setfocus;

end;

end.