unit Unit1 interface uses Windows Messages SysUtils Variants Classes G

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unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Label1: TLabel;
Edit1: TEdit;
Label2: TLabel;
Edit2: TEdit;
Button1: TButton;
Memo1: TMemo;
Button2: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
var a,b,r1,r2,r3,n:extended;
procedure TForm1.Button1Click(Sender: TObject);
begin
a:=StrToFloat(edit1.text);
b:=StrToFloat(edit2.Text);
r1:=a+b;
r2:=a*b;
r3:=a/b;
Memo1.Lines.Add('Line 3');
memo1.Lines[0]:=FloatToStr(r1);
memo1.Lines[1]:=FloatToStr(r2);
memo1.Lines[2]:=floatTostr(r3);
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
memo1.lines.clear;
end;
end.