4
( Case, ListBox).
:
..
2009 .
(Case) Object Pascal.
2. .
case
, , if. , , .
Delphi case, . :
case of 1:
begin
{ 1 } end; 2:
begin
{ 2 } end; 3:
begin
{ N }
end;
else
begin
{ )
end;
end;
:
- , ( , );
N - . , , . , 1, 2, 3, 4, 5, 6 1..6.
case :
1. -.
2. - .
3. , . s .
4. - , , else.
case else . , , case .
1.7 , case.
. 1.7. , case
case.
case n_day of
1,2,3,4,5: day:=' . ';
6: day:=' Cyoa!';
7: day:='!';
end;
case n_day of
1..5: day:=' .';
6: day:='!';
7: day:='!';
end;
case n_day of
6: day:='!';
7: day:='!';
else day:=' .';
end;
3. ϳ .
3.1. ϳ ;
3.2. ;
3.3. .
4.
1) , Case
2) CASE
3) , ?
|
|
|
4) Delphi?
5) Delphi?
6) Delphi?
5.1. Windows;
5.2. Delphi
6.1. Delphi;
6.2. ( 1 2) Delphi:
6.3. , Case
6.4. ( 1 2) Delphi:
1. case , . , "" -. , 409,5 , 볿 - 453,592 , ͳ, 䳿 500 .
, 1.8, .
. 1.8. ij case
ListBox. ListBox Standard ( 1.9). , , , . 1.5 ListBox.
. 1.9. ListBox
1.5. ListBox
| Name | ' . |
| Items | |
| Itemindex | . |
| Left | ³ |
| Top | ³ |
| Height | |
| Width | |
| Font | , |
| Parent-Font |
Items Itemindex. items .
itemindex . , .
.
Object Inspector items ( 1.10).
. 1.10.
, , String List Editor (. 1.11) , . ϳ <Enter>. ϳ <Enter> . , .
. 1.11.
1.6 , 1.7 .
1.6.
| ListBoxl | , |
| Editl | |
| Label1, Label2, Label3 | |
| Label4 | |
| Button1 |
1.7.
|
|
|
| Form1.Caption | case |
| Editl. Text | |
| Label1. Caption | , |
| Label2.Caption | |
| Label3. Caption | |
| Button1. Caption |
, , , . .
1.3 .
˳ 1.3.
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes,
Graphics, Controls, Forms, Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Label2: TLabel;
Editl: TEdit; //
Button1: TButton; //
Label1: TLabel;
Label: TLabel;
ListBox1: TListBox; //
Label4: TLabel; // -
procedure FqrmCreate(Sender: TObject);
procedure ButtonlClick(Sender: TObject); private
{ Private declarations } public
{ Public declarations } end;
var
Form1: TForml;
implementation
{$R *.DFM}
procedure TForml.FormCreate(Sender: TObject);
begin
{
ListBox1.items.add('');
ListBox1.items.add('');
ListBox1.iterns.add('');
ListBox1.items.add('ͳ');
ListBox1.iterns.add ('');
ListBoxl.iterns.add('');
ListBox1.iterns.add ('');
ListBox1.items.add ('ͳ'); }
ListBox1.itemindex:=0; end;
procedure TForm1.ButtonlClick(Sender: TObject);
var
funt:real; //
kg:real; //
k:real; //
begin
case ListBoxl.Itemindex of
0: k:=0.4095; //
1: k:=0.453592; //
2:k:=0.56001; //
3..5,7:k:=0.5; // ͳ, , , ͳ
6: k:=0.31762; //
end;
funt:=StrToFloat(Editl.Text);
kg:=k*funt;
label4.caption:=Editl.Text
+ ' . - '
+ FloatToStr(kg,ffFixed, 6,3) + '.';
end;
end.
䳿 FormCreate, ( ). , . , .
2. case. , , .
, , , : "", "" "" (123 , 120 , 121 ). , , , , 1.8.
1.8.
| , | |
| 0, 5, 6, 7, 8, 9 | |
| 2,3,4 |
, 11, 12, 13, 14. , , "".
ij 1.12, - 1.4. , , 䳿 onKeyPress.
. 1.12. ij
˳ 1.4. ,
unit. rub_l; interface
|
|
|
uses
Windows, Messages, SysUtils,
Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm) Label1: TLabel;
Editl: TEdit; Label2: TLabel;
procedure EditlKeyPress(Sender: TObject; var Key: Char);
private
{ Private declarations } public
{ Public declarations } end;
var
Form1: TForm1;
implementation
{$R *.dfm}
//
procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char) var
n: integer; //
r: integer; // n 10
text: string[10]; // ,
begin
if Key = chr(VK_RETURN) then
begin
n:= StrToInt(Editl.Text); if n > 100
then n:=n mod 100;
if (n >= 11) and (n <= 14) then
text:=' ' else begin
r:= n mod 10; case r of
1: text:=' '; 2.. 4: text:=' ';
else text:=' ';
end;
end;
Label2.Caption:= IntToStr(n)+ text; end;
end;
end.
7.
7.1. .
7.2. .
7.3. .
7.4. .
˳:
1. . Delphi . .2002.
2. 7.0.: BHV.
3. .. Delphi. ., 1999.
:
1.
:
2:
:
