Marco's Web Center

Menu for Development

Site Menu
Object Pascal Handbook
Delphi Handbooks Collection
Mastering Borland Delphi 2005
(Old) White Papers
(Old)Tools
(Old) Conferences

My Other Sites
Italian Site (www.marcocantu.it)
the delphi search

Spirit of delphi

Advertising
Home My Blog Books Object Pascal Marco

Home: Code Repository: Mastering Delphi 6

Chapter 02 - Project Dates1

Project Structure

Dates1.dpr
program Dates1;

uses
  Forms,
  Dates1Form in 'Dates1Form.pas' {Form1};

{$R *.RES}

begin
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.Run;
end.
Dates1Form.pas
unit Dates1Form;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TDate = class
    Month, Day, Year: Integer;
    procedure SetValue (m, d, y: Integer);
    function LeapYear: Boolean;
  end;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Label1: TLabel;
    EditYear: TEdit;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TDate.SetValue (m, d, y: Integer);
begin
  Month := m;
  Day := d;
  Year := y;
end;

function TDate.LeapYear: Boolean;
begin
  // call IsLeapYear in SysUtils.pas
  Result := IsLeapYear (Year);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  ADay: TDate;
begin
  // create an object
  ADay := TDate.Create;
  // use the object
  ADay.SetValue (1, 1, StrToInt (EditYear.Text));
  if ADay.LeapYear then
    ShowMessage ('Leap year: ' + IntToStr (ADay.Year));
  // destroy the object
  ADay.Free;
end;

end.
Dates1Form.dfm
object Form1: TForm1
  Left = 192
  Top = 107
  Width = 291
  Height = 186
  Caption = 'Dates1'
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  OldCreateOrder = False
  PixelsPerInch = 96
  TextHeight = 13
  object Label1: TLabel
    Left = 72
    Top = 88
    Width = 25
    Height = 13
    Caption = 'Year:'
  end
  object Button1: TButton
    Left = 72
    Top = 48
    Width = 130
    Height = 25
    Caption = 'Leap Year?'
    TabOrder = 0
    OnClick = Button1Click
  end
  object EditYear: TEdit
    Left = 104
    Top = 84
    Width = 98
    Height = 21
    Color = clWindow
    TabOrder = 1
    Text = '2000'
  end
end