unit1.pas

第五章练习题

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    GroupBox1: TGroupBox;
    Label2: TLabel;
    Label3: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    procedure Edit1Change(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
function eno(y:integer):real;
var t:integer;
a,b,e,s,f:real;
begin
t:=1;
s:=0;
a:=1;
b:=1;
f:=1;
e:=exp(13*ln(0.1));
while f/a>=e do
  begin
     a:=a*t;
     f:=exp(t*ln(y));
     s:=s+f/a;
     t:=t+1;
  end;
  eno:=exp(1/y*ln(1+s));
end;
procedure TForm1.Edit1Change(Sender: TObject);
var y:integer;
    c:real;
    m:string;
begin
if edit1.Text='' then edit1.Text:='6';
y:=strtoint(edit1.text);
c:=eno(y);
m:=format('%20.15f',[c]);
edit2.Text:=copy(m,0,15);
end;
end.