While语句的应用

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
  s,n: integer;
begin
  s := 0;                     //存放累加和
  n := 1;                     //存放累加次数
  while n <= 100 do
    begin
      s := s+n;
      n := n+1;
    end;
  edit1.Text := inttostr(s);
end;

end.