能!
调用windows的也可以,写也可以。。。
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, XPMenu, StdCtrls;
type
TFrmcounter = class(TForm)
private
{ Private declarations }
public
{ Public declarations }
end;
var
Frmcounter: TFrmcounter;
temp1: string;
temp2: real;
n: integer;
implementation
{$R *.dfm}
procedure TFrmcounter.Button7Click(Sender: TObject);
begin
edit1.Text:=edit1.Text+'1'
end;
procedure TFrmcounter.Button9Click(Sender: TObject);
begin
edit1.Text:=edit1.Text+'2'
end;
procedure TFrmcounter.Button15Click(Sender: TObject);
begin
edit1.Text:=edit1.Text+'3'
end;
procedure TFrmcounter.Button2Click(Sender: TObject);
begin
edit1.Text:=edit1.Text+'4'
end;
procedure TFrmcounter.Button3Click(Sender: TObject);
begin
edit1.Text:=edit1.Text+'5'
end;
procedure TFrmcounter.Button4Click(Sender: TObject);
begin
edit1.Text:=edit1.Text+'6'
end;
procedure TFrmcounter.Button11Click(Sender: TObject);
begin
edit1.Text:=edit1.Text+'7'
end;
procedure TFrmcounter.Button6Click(Sender: TObject);
begin
edit1.Text:=edit1.Text+'8'
end;
procedure TFrmcounter.Button5Click(Sender: TObject);
begin
edit1.Text:=edit1.Text+'9'
end;
procedure TFrmcounter.Button10Click(Sender: TObject);
begin
edit1.Text:=edit1.Text+'0'
end;
procedure TFrmcounter.Button14Click(Sender: TObject);
begin
edit1.Text:=edit1.Text+'00'
end;
procedure TFrmcounter.Button8Click(Sender: TObject);
begin
edit1.Text:=edit1.Text+'.'
end;
procedure TFrmcounter.Button19Click(Sender: TObject);
begin
edit1.Clear
end;
procedure TFrmcounter.Button20Click(Sender: TObject);
begin
edit1.Text:=edit1.Text+'%'
end;
procedure TFrmcounter.Button12Click(Sender: TObject);
begin
n:=1;
temp1:=edit1.text;
edit1.clear;
end;
procedure TFrmcounter.Button18Click(Sender: TObject);
begin
case n of
1:temp2:=strtofloat(temp1)+strtofloat(edit1.text);
2:temp2:=strtofloat(temp1)-strtofloat(edit1.text);
3:temp2:=strtofloat(edit1.text)*strtofloat(temp1);
4:if strtofloat(edit1.text)=0 then
begin
showmessage('除数为0!');
exit;
end
else
temp2:=strtofloat(temp1)/strtofloat(edit1.text);
end;
edit1.text:=floattostr(temp2);
end;
procedure TFrmcounter.Button1Click(Sender: TObject);
begin
n:=2;
temp1:=edit1.text;
edit1.clear;
end;
procedure TFrmcounter.Button13Click(Sender: TObject);
begin
n:=3;
temp1:=edit1.text;
edit1.clear;
end;
procedure TFrmcounter.Button16Click(Sender: TObject);
begin
n:=4;
temp1:=edit1.text;
edit1.clear;
end;
end.