Extensive DEMO code of Delphi

Code file:
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Unit unit1;

Interface

Uses
Windows, messages, sysutils, variants, classes, graphics, controls, forms,
Dialogs, stdctrls;

Type
Tform1 = Class (tform)
Memo1: tmemo;
Button1: tbutton;
Button2: tbutton;
Button3: tbutton;
Button4: tbutton;
Button5: tbutton;
Procedure button1click (Sender: tobject );
Procedure button2click (Sender: tobject );
Procedure button3click (Sender: tobject );
Procedure Button4Click (Sender: TObject );
Procedure Button5Click (Sender: TObject );
End;

Var
Form1: TForm1;

Implementation

{$ R *. dfm}

Type
TArr <T> = array [0 .. 9] of T; {defines a Generic array}
{Although T is used to refer to other types, other valid identifiers are also supported}

{Used as Integer}
Procedure TForm1.Button1Click (Sender: TObject );
Var
Arr: TArr <Integer>;
I: Integer;
Begin
For I: = Low (Arr) to High (Arr) do
Arr [I]: = I * I;

Memo1.Clear;
For I: = Low (Arr) to High (Arr) do
Memo1.Lines. Add (Format ('Arr [% d] = % d', [I, Arr [I]);
End;

{Used as string}
Procedure TForm1.Button2Click (Sender: TObject );
Var
Arr: TArr <string>;
I: Integer;
Begin
For I: = Low (Arr) to High (Arr) do
Arr [I]: = StringOfChar (Char (I + 97), 3 );

Memo1.Clear;
For I: = Low (Arr) to High (Arr) do
Memo1.Lines. Add (Format ('Arr [% d] = % s', [I, Arr [I]);
End;

{Used as Single}
Procedure TForm1.Button3Click (Sender: TObject );
Var
Arr: TArr <Single>;
I: Integer;
Begin
For I: = Low (Arr) to High (Arr) do
Arr [I]: = 100/(I + 1 );

Memo1.Clear;
For I: = Low (Arr) to High (Arr) do
Memo1.Lines. Add (Format ('Arr [% d] = % F', [I, Arr [I]);
End;

{Used as record TPoint}
Procedure TForm1.Button4Click (Sender: TObject );
Var
Arr: TArr <TPoint>;
I: Integer;
Begin
For I: = Low (Arr) to High (Arr) do
Arr [I]: = Point (I, I * 2 );

Memo1.Clear;
For I: = Low (Arr) to High (Arr) do
Memo1.Lines. add (Format ('Arr [% d] = (% d, % d) ', [I, Arr [I]. x, Arr [I]. y]);
End;

{Used as a class TButton}
Procedure TForm1.Button5Click (Sender: TObject );
Var
Arr: TArr <TButton>;
I: Integer;
Begin
For I: = Low (Arr) to High (Arr) do
Begin
Arr [I]: = TButton. Create (Self );
Arr [I]. Name: = Concat ('btn ', IntToStr (I + 1 ));
End;

Memo1.Clear;
For I: = Low (Arr) to High (Arr) do
Memo1.Lines. Add (Format ('Arr [% d] is % s', [I, Arr [I]. Name]);

For I: = Low (Arr) to High (Arr) do Arr [I]. Free;
End;

End.
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Form file:
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Object Form1: TForm1
Left = 0
Top = 0
Caption = 'form1'
ClientHeight = 1, 158
ClientWidth = 232
Color = clBtnFace
Font. Charset = DEFAULT_CHARSET
Font. Color = clWindowText
Font. Height =-11
Font. Name = 'tahoma'
Font. Style = []
OldCreateOrder = False
PixelsPerInch = 96
TextHeight = 13
Object Button1: TButton
Left = 1, 136
Top = 6
Width = 75
Height = 25
Caption = 'button1'
TabOrder = 0
OnClick = Button1Click
End
Object Memo1: TMemo
Left = 0
Top = 0
Width = 113
Height = 158
Align = alLeft
Lines. Strings = (
'Mo1 ')
ScrollBars = ssVertical
TabOrder = 1
ExplicitHeight = 167
End
Object Button2: TButton
Left = 1, 136
Top = 36
Width = 75
Height = 25
Caption = 'button2'
TabOrder = 2
OnClick = Button2Click
End
Object Button3: TButton
Left = 1, 136
Top = 66
Width = 75
Height = 25
Caption = 'button3'
Taborder = 3
Onclick = button3click
End
Object button4: tbutton
Left = 1, 136
Top = 96
Width = 75
Height = 25
Caption = 'button4'
Taborder = 4
Onclick = button4click
End
Object button5: tbutton
Left = 1, 136
Maximum = 126
Width = 75
Height = 25
Caption = 'button5'
TabOrder = 5
OnClick = Button5Click
End
End

Source code download: http://www.rayfile.com/files/f5fd6dde-1621-11df-a3e2-0015c55db73d/