Лаба 6 вар 9 / 2 / Unit1

unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, Sint;
type
TForm1 = class(TForm)
Label1: TLabel;
Edit1: TEdit;
Label2: TLabel;
Edit2: TEdit;
Label3: TLabel;
Button1: TButton;
procedure Button1Click(Sender: TObject);
procedure Edit1KeyPress(Sender: TObject; var Key: Char);
procedure Edit1Change(Sender: TObject);
procedure Edit2Change(Sender: TObject);
procedure Edit2KeyPress(Sender: TObject; var Key: Char);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
var x, y:real;
a, b, c, d:boolean;
begin
x:=StrToFloat(Edit1.Text);
y:=StrToFloat(Edit2.Text);
a:=(y<=-x+2) and (x>=0) and (y>=0) and (x<=2) and (y<=2);
b:=(y>=-x-2) and (x<=0) and (y<=0) and (x>=-2) and (y>=-2);
c:=(y<=x+2) and (x>=0) and (y<=0) and (x<=2) and (y>=-2);
d:=(y>=x-2) and (x<=0) and (y>=0) and (x>=-2) and (y<=2);
if a or b or c or d then Label3.Caption:='Точка принадлежит области'
else Label3.Caption:='Точка не принадлежит области';
end;
procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
Control(Key, Edit1.Text);
end;
procedure TForm1.Edit1Change(Sender: TObject);
begin
Button1.Enabled:=Control2(Edit1.Text) and Control2(Edit2.Text);
end;
procedure TForm1.Edit2Change(Sender: TObject);
begin
Button1.Enabled:=Control2(Edit1.Text) and Control2(Edit2.Text);
end;
procedure TForm1.Edit2KeyPress(Sender: TObject; var Key: Char);
begin
Control(Key, Edit2.Text);
end;
end.