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
  i:Integer;            //定义变量
  s,t:Real;
begin
  i:=1;                //i代表项号，1/1!为第一项
  s:=1;                //s代表和，初值为1
  t:=1;                //t代表要加到的那一项的值，初值为1
  Repeat
    t:=t*1.0/i;          //求每个加数即一般项
    s:=s+t;           //累加求和
    i:=i+1;            //每做一次加法，循环变量增加1
  Until (t<=0.00001); //符合要求的精度即终止循环
  Edit1.Text:=FloatToStr(s);
end;

end.