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;
    Label2: TLabel;
    Edit2: 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
  t,n,s:Integer;
begin
  t:=1;                //t表示乘到的那一项的值，赋初值1
  n:=StrToInt(Edit1.Text); //n代表自然数，要求它的阶乘
  s:=1;                  //存放乘积，即阶乘的值
  Repeat
    s:=s*t;           //连乘
    t:=t+1;           //每循环一次，变量增加1
  Until (t>n);    {注意循环条件，能否写成m>=n？如果能，程序该如何
                   修改？请读者思考}
  Edit2.Text:=IntToStr(s);
end;

end.