unitmath.pas

将一些标准数值与非数值算法集中封装在几个DLL中,需要用时可在VB/Delphi/C#中分别调用,这里提供了3个小程序,分别用于线性方程组求根、计算行列式的值、矩阵求逆。

unit Unitmath;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    Edit5: TEdit;
    Edit6: TEdit;
    Edit7: TEdit;
    Edit8: TEdit;
    Edit9: TEdit;
    Edit10: TEdit;
    Edit11: TEdit;
    Edit12: TEdit;
    Edit13: TEdit;
    Edit14: TEdit;
    Edit15: TEdit;
    Edit16: TEdit;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);

  private
    { Private declarations }
  public
    { Public declarations }

  end;
type Tf=function(var a: double;n:Integer;var det:double):Integer;stdcall; //_bchol@12
//错误声明：type Tf=function(var a:array of double;n:Integer;var det:double):Integer;stdcall;
type THandle=Integer;//int
var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  a:array [1..16] of Double;
  det:Double;
  Handle:THandle;
  bchol:Tf;
  //s:string;
  //i:integer;
begin
 a[1]:=StrToFloat(edit1.text);
 a[2]:=StrToFloat(edit2.text);
 a[3]:=StrToFloat(edit3.text);
 a[4]:=StrToFloat(edit4.text);
 a[5]:=StrToFloat(edit5.text);
 a[6]:=StrToFloat(edit6.text);
 a[7]:=StrToFloat(edit7.text);
 a[8]:=StrToFloat(edit8.text);
 a[9]:=StrToFloat(edit9.text);
 a[10]:=StrToFloat(edit10.text);
 a[11]:=StrToFloat(edit11.text);
 a[12]:=StrToFloat(edit12.text);
 a[13]:=StrToFloat(edit13.text);
 a[14]:=StrToFloat(edit14.text);
 a[15]:=StrToFloat(edit15.text);
 a[16]:=StrToFloat(edit16.text);
 Handle:=LoadLibrary('MATHLIB52.DLL');
 @bchol:=GetProcAddress(Handle,'_bchol@12');
bchol(a[1],4,det);
ShowMessage('行列式的值：' + FloatToStr(det));
FreeLibrary(Handle);
end;

end.