unit1.pas

《Delphi常用数值算法集》的配书源码

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;
Function FUNC(X:real):real;
type
  TForm1 = class(TForm)
    Button1: TButton;
    Memo1: TMemo;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
//PROGRAM D9R1
//Driver for routine MNBRAK
uses
  unit2;
  {$R *.DFM}
Function FUNC(X:real):real;
begin
    FUNC:= BESSJ0(X);
end;

procedure TForm1.Button1Click(Sender: TObject);
const
  s1='%14.6f';
var
  F:TextFile;
  I:integer;  AX,BX,CX,FA,FB,FC:real;
begin
  //输出计算结果到文件
  AssignFile(F, 'd:\delphi_shu\p9\d9r1.dat');
  Rewrite(F);
  For I:=1 To 10 do
  begin
    AX:= I * 0.5;
    BX:=(I + 1)*0.5;
    MNBRAK(AX,BX,CX,FA,FB,FC);
    Writeln(F, '              A             B             C');
    Writeln(F,'    ', 'X',Format(S1,[AX]),Format(S1,[BX]),Format(S1,[CX]));
    Writeln(F,'    ', 'F',Format(S1,[FA]),Format(S1,[FB]),Format(S1,[FC]));
  end;
  CloseFile(F);
  //屏幕显示计算结果
  memo1.Lines.LoadFromFile('d:\delphi_shu\p9\d9r1.dat');
end;
end.