(Delphi) 델파이 사용 예제

unit Unit1;
interface
uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;
type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    Button6: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
  private
    procedure test2(text: string);
    function test3: string;
    function test170324: string;
  public
    procedure test;
    var
      i : Integer;
  end;
var
  Form1: TForm1;
implementation
{$R *.dfm}
function TForm1.test3: string;
begin
  Result := 'ddd';
end;
function TForm1.test170324: string;
begin
  Result := 'test170324';
end;
procedure TForm1.test;
begin
  ShowMessage('testtest');
end;
procedure TForm1.test2(text : string);
begin
  ShowMessage(text);
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
//  if 1 = 1 then begin //true
  if 1 <> 1 then begin        //false
    ShowMessage('맞아요');
  end else begin
    ShowMessage('틀려요');
  end;
end;
procedure TForm1.Button2Click(Sender: TObject);
var
  i : Integer;
  s : String;
begin // 순차적으로 실행
  i := 0;
  // while i < 10 do begin
  while i < do begin
    ShowMessage(IntToStr(i));
    i := i + 1;
    if i = 3 then break;
  end;
  s := 'test';
  ShowMessage(s);
end;
procedure TForm1.Button3Click(Sender: TObject);
var
  i : integer;
begin
  for i := 5 downto 0 do begin
    ShowMessage(IntToStr(i)); // 543210 6번 실행
  end;
end;
procedure TForm1.Button4Click(Sender: TObject);
begin
  test;
  test2('qkqh');
  test2(test3);
end;
procedure TForm1.Button5Click(Sender: TObject);
begin
  test2(test170324);
end;
end.