unit1.pas

用于开发税务票据管理的软件

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Memo1: TMemo;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
type
  matrx2=array of array of real;
var
  Form1: TForm1;

implementation
//PROGRAM D13R1
//Driver for routine SOR
uses
  unit2;
  {$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
const
  s1='%7.2f';   JMAX =11;  PI =3.1415926;
var
  F:TextFile;   A,B,C,D,E,FF,U:matrx2;
  I,J,MIDL:integer;    RJAC,AAA:real;   STR1:String;
begin
  SetLength(A,12,12);
  SetLength(B,12,12);
  SetLength(C,12,12);
  SetLength(D,12,12);
  SetLength(E,12,12);
  SetLength(FF,12,12);
  SetLength(U,12,12);
  For I:=1 To JMAX do
  begin
    For J:=1 To JMAX do
    begin
      A[I, J]:=1;
      B[I, J]:=1;
      C[I, J]:=1;
      D[I, J]:=1;
      E[I, J]:=-4;
      FF[I, J]:=0;
      U[I, J]:=0;
    end;
  end;
  MIDL:=JMAX div 2 + 1;
  FF[MIDL, MIDL]:=2;
  RJAC:=Cos(PI / JMAX);
  SOR(A, B, C, D, E, FF, U, JMAX, RJAC);
  //输出计算结果到文件
  AssignFile(F, 'd:\delphi_shu\p13\d13r1.dat');
  Rewrite(F);
  Writeln(F);
  Writeln(F,'SOR Solution:');
  Writeln(F);
  For I:=1 To JMAX do
  begin
    STR1:=' ';
    For J:=1 To JMAX do
      STR1:=STR1 + '  '+ Copy(FloatToStr(U[I,J]),1,5);
    Writeln(F,STR1);
  end;
  Writeln(F);
  Writeln(F,'Test that sulotion satisfies Difference Eqns:');
  Writeln(F);
  For I:=2 To JMAX - 1 do
  begin
    For J:=2 To JMAX - 1 do
    begin
      AAA:=U[I + 1, J] + U[I - 1, J] + U[I, J + 1] + U[I, J - 1];
      FF[I, J]:=AAA - 4 * U[I, J];
    end;
    Writeln(F,Format(s1,[FF[I,2]]),Format(s1,[FF[I,3]]),
      Format(s1,[FF[I,4]]),Format(s1,[FF[I,5]]),Format(s1,[FF[I,6]]),
      Format(s1,[FF[I,7]]),Format(s1,[FF[I,8]]),Format(s1,[FF[I,9]]),
      Format(s1,[FF[I,10]]));
  end;
  CloseFile(F);
  //屏幕显示计算结果
  memo1.Lines.LoadFromFile('d:\delphi_shu\p13\d13r1.dat');
end;

end.