unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Memo1: TMemo;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
//PROGRAM D4R4
//Driver for routine FACTLN
uses
  unit2;
  {$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
var
  ACTUAL:array[1..5] of real;X:array[1..5] of integer;
  F:TextFile;  j:Integer;
const
  s1='#####';s2='%16.6f';
begin
  ACTUAL[1]:=0.693147;    ACTUAL[2]:=4.787492;
  ACTUAL[3]:=15.10441;    ACTUAL[4]:=27.89927;
  ACTUAL[5]:=42.33562;
  X[1]:=2;     X[2]:=5;
  X[3]:=10;    X[4]:=15;
  X[5]:=20;
  //輸出計算結果到文件
  AssignFile(F, 'd:\delphi_shu\p4\d4r4.dat');
  Rewrite(F);
  Writeln(F, 'N         Actual         FACTLN(N)');
  For j:= 1 To 5 do
  Writeln(F,FormatFloat(s1,X[j]),Format(s2,[Actual[j]]),
                                         Format(s2,[FACTLN(X[j])]));
  CloseFile(F);
  //屏幕顯示計算結果
  memo1.Lines.LoadFromFile('d:\delphi_shu\p4\d4r4.dat');
end;

end.