unit1.pas

本光盘是《Delphi 7应用教程》一书的配套光盘

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Edit1: TEdit;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  k,s:Integer;           //定义整型变量
begin
  s:=0;                  //给变量赋初值
  k:=2;
  While (k<=50) do      //While循环语句
    begin               //循环体为复合语句
      s:=s+k;           //实现累加
      k:=k+1;           //每加一次，循环变量加1
    end;
  Edit1.Text:=IntToStr(s); 
end;

end.