implementation
//PROGRAM D4R23
//Driver for routine BESSI1
uses
  unit2;
{$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
var
  ACTUAL:array[1..5] of real;X:array[1..5] of real;
  F:TextFile;  j:Integer; 
const
  s1='%8.2f';s2='0.000000e+00';
begin
  ACTUAL[1]:=0.1005008;       ACTUAL[2]:=0.5651592;
  ACTUAL[3]:=0.7146779;       ACTUAL[4]:=1.590637;
  ACTUAL[5]:=24.33564;
  X[1]:=0.2;     X[2]:=1;
  X[3]:=1.2;     X[4]:=2;
  X[5]:=5;
  //輸出計算結果到文件
  AssignFile(F, 'd:\delphi_shu\p4\d4r23.dat');
  Rewrite(F);
  Writeln(F, '     X         Actual       BESSI1(X)');
  For j:= 1 To 5 do
  begin
    Writeln(F,Format(s1,[X[j]]),'    ',FormatFloat(s2,Actual[j]),
                                '    ',FormatFloat(s2,BESSI1(X[J])));
  end;
  CloseFile(F);
  //屏幕顯示計算結果
  memo1.Lines.LoadFromFile('d:\delphi_shu\p4\d4r23.dat');
end;