Блок-схема
 

Помогите пожалуйста составить блок-схему к программе в делфи, очень нужно. Сам я в них мало что понимаю.
Код программы:


unit Unit2;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, Grids, Unit1, Printers, Unit3, StdCtrls, jpeg, ExtCtrls, Menus, ShellAPI, ComCtrls, Spin, XPMan, Math;
type
Masiv = array[0..10, 0..10] of real;
TForm2 = class(TForm)
StringGrid1: TStringGrid;
Label1: TLabel;
Label2: TLabel;
Edit1: TEdit;
Edit2: TEdit;
Image1: TImage;
Button1: TButton;
Button2: TButton;
Button3: TButton;
Button4: TButton;
Button5: TButton;
Button6: TButton;
Button7: TButton;
Button8: TButton;
Button9: TButton;
Button10: TButton;
OpenDialog1: TOpenDialog;
SaveDialog1: TSaveDialog;
Button11: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button4Click(Sender: TObject);
procedure Button5Click(Sender: TObject);
procedure Button7Click(Sender: TObject);
procedure Button8Click(Sender: TObject);
procedure Button9Click(Sender: TObject);
procedure Button10Click(Sender: TObject);
function det(A: Masiv; n: integer): real;
procedure Button11Click(Sender: TObject);
procedure Button6Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
a: Masiv;
Form2: TForm2;
i,j,m,n,k,z:integer;
r:real;
det:real;
prn:textfile;
f:textFile;
s,s1:string;
implementation

{$R *.dfm}

procedure TForm2.Button1Click(Sender: TObject);
begin
z:=StrToInt(Edit1.Text);
StringGrid1.ColCount:=z;
StringGrid1.RowCount:=z;
end;

procedure TForm2.Button4Click(Sender: TObject);
begin
Randomize;
for i:=0 to z do
for j:=0 to z do
StringGrid1.Cells[i,j]:=IntToStr(Random(15));
end;

procedure TForm2.Button5Click(Sender: TObject);
begin
assignprn(prn);
rewrite(prn);
printer.canvas.font := stringgrid1.font;
for k := 0 to stringgrid1.ControlCount-1 do
writeln(prn, stringgrid1.ControlCount);
closefile(prn);
end;

procedure TForm2.Button7Click(Sender: TObject);
begin
form2.Hide;
form1.Show;
end;

procedure TForm2.Button8Click(Sender: TObject);
begin
form2.Hide;
form3.Show;
end;

procedure TForm2.Button9Click(Sender: TObject);
begin
close;
end;

procedure TForm2.Button10Click(Sender: TObject);
begin
for i := 0 to z do
begin
for j := 0 to z do
StringGrid1.Cells[i, j] := '';
Edit1.Text:= '';
Edit2.Text:= '';
end;
end;

procedure TForm2.Button2Click(Sender: TObject);
var
i, j, k: integer;
r, res, d: real;
begin
for i := 1 to z do
begin
for j := 1 to z do
a[i,j] := StrToFloat(StringGrid1.Cells[j-1, i-1]);
end;
d := det(a, z);
Edit2.Text:= FloatToStr(d);
end;

function TForm2.det(a: Masiv; n: integer): real;
var
s, d, dd: real;
a1: Masiv;
ii, jj, j, m: integer;
begin
if (n = 2) then
s := a[1, 1] * a[2, 2] - a[1, 2] * a[2, 1]
else
begin
s := 0;
for j := 1 to n do
begin
d := power(-1, 1 + j) * a[1, j];
m := n - 1;
ii := 2;
while (ii <= n) do
begin
jj := 1;
while (jj <= n) do
begin
if (jj < j) then
a1[ii - 1, jj] := a[ii, jj];
if (jj > j) then
a1[ii - 1, jj - 1] := a[ii, jj];
if (jj = j) then
begin
a1[ii - 1, jj] := a[ii, jj + 1];
jj := jj + 1;
end;
jj := jj + 1;
end;
ii := ii + 1;
end;
d := d * det(a1, m);
s := s + d;
end;
end;
det := s;
end;

procedure TForm2.Button11Click(Sender: TObject);
var
myhelp: string;
begin
myhelp:=extractfilepath(application.ExeName) + 'NewProject.chm';
shellexecute(handle, 'open', pchar(myhelp), nil, nil, sw_restore);
end;

procedure TForm2.Button6Click(Sender: TObject);
Var f: TextFile;
i, k: Integer;
s,s1:string;
begin
if SaveDialog1.Execute
then begin
AssignFile(f,SaveDialog1.FileName);
Rewrite(f);
Append(f);
for i:=0 to StringGrid1.RowCount-1 do
begin
for k:=0 to StringGrid1.ColCount-1 do
begin
s1:= s1 + ' '+ StringGrid1.Cells[k,i];
end;
Writeln(f,s1);
s1:='';
end;
CloseFile(f);
end;
end;

procedure TForm2.Button3Click(Sender: TObject);
begin
if OpenDialog1.Execute then
assignfile(f,OpenDialog1.FileName);
reset(f);
for i:=0 to StringGrid1.RowCount-1 do
for j:=0 to StringGrid1.ColCount-1 do
begin
read(f,a[i,j]);
StringGrid1.Cells[j,i]:=floattostr(a[i,j]);
end;
closeFile(f);
end;
end.