计算器（加了个小数点）。。。

unit jisuanqiU;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls;

type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
Button3: TButton;
Button4: TButton;
Button5: TButton;
Button6: TButton;
Button7: TButton;
Button8: TButton;
Button9: TButton;
Button10: TButton;
Button11: TButton;
Button12: TButton;
Button13: TButton;
Button14: TButton;
Button15: TButton;
Panel1: TPanel;
Edit1: TEdit;
Button17: TButton;
Button16: TButton;
Button18: TButton;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure Button4Click(Sender: TObject);
procedure Button5Click(Sender: TObject);
procedure Button6Click(Sender: TObject);
procedure Button7Click(Sender: TObject);
procedure Button8Click(Sender: TObject);
procedure Button9Click(Sender: TObject);
procedure Button10Click(Sender: TObject);
procedure Button12Click(Sender: TObject);
procedure Button13Click(Sender: TObject);
procedure Button14Click(Sender: TObject);
procedure Button15Click(Sender: TObject);
procedure Button17Click(Sender: TObject);
procedure Button16Click(Sender: TObject);
procedure Button11Click(Sender: TObject);
procedure FormShow(Sender: TObject);
procedure Button18Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;
// num,num1,num2:integer;
s,j,i,s_number,s_type,s_characterlast:string;
implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
if s_type=''''1'''' then begin
edit1.Text:=edit1.Text ''''1'''';
s:=''''123''''; end
else begin
edit1.text:='''''''';
edit1.text:=edit1.Text ''''1'''';
s_type:=''''1'''';
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
if s_type=''''1'''' then begin
edit1.Text:=edit1.Text ''''2'''';
s:=''''123''''; end
else begin
edit1.text:='''''''';
edit1.text:=edit1.Text ''''2'''';
s_type:=''''1'''';
end;
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
if s_type=''''1'''' then begin
edit1.Text:=edit1.Text ''''3'''';
s:=''''123''''; end
else begin
edit1.text:='''''''';
edit1.text:=edit1.Text ''''3'''';
s_type:=''''1'''';
end;;
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
if s_type=''''1'''' then begin
edit1.Text:=edit1.Text ''''4'''';
s:=''''123''''; end
else begin
edit1.text:='''''''';
edit1.text:=edit1.Text ''''4'''';
s_type:=''''1'''';
end;
end;

procedure TForm1.Button5Click(Sender: TObject);
begin
if s_type=''''1'''' then begin
edit1.Text:=edit1.Text ''''5'''';
s:=''''123''''; end
else begin
edit1.text:='''''''';
edit1.text:=edit1.Text ''''5'''';
s_type:=''''1'''';
end;
end;

procedure TForm1.Button6Click(Sender: TObject);
begin
if s_type=''''1'''' then begin
edit1.Text:=edit1.Text ''''6'''';
s:=''''123''''; end
else begin
edit1.text:='''''''';
edit1.text:=edit1.Text ''''6'''';
s_type:=''''1'''';
end;
end;

procedure TForm1.Button7Click(Sender: TObject);
begin
if s_type=''''1'''' then begin
edit1.Text:=edit1.Text ''''7'''';
s:=''''123''''; end
else begin
edit1.text:='''''''';
edit1.text:=edit1.Text ''''7'''';
s_type:=''''1'''';
end;
end;

procedure TForm1.Button8Click(Sender: TObject);
begin
if s_type=''''1'''' then begin
edit1.Text:=edit1.Text ''''8'''';
s:=''''123''''; end
else begin
edit1.text:='''''''';
edit1.text:=edit1.Text ''''8'''';
s_type:=''''1'''';
end;
end;

procedure TForm1.Button9Click(Sender: TObject);
begin
if s_type=''''1'''' then begin
edit1.Text:=edit1.Text ''''9'''';
s:=''''123''''; end
else begin
edit1.text:='''''''';
edit1.text:=edit1.Text ''''9'''';
s_type:=''''1'''';
end;
end;

procedure TForm1.Button10Click(Sender: TObject);
begin

if s_type=''''1'''' then begin
edit1.Text:=edit1.Text ''''0'''';
s:=''''123''''; end
else begin
edit1.text:='''''''';
edit1.text:=edit1.Text ''''0'''';
s_type:=''''1'''';
end;

end;

procedure TForm1.Button12Click(Sender: TObject);
begin
s_type:=''''0'''';
if s='''''''' then
application.MessageBox(''''请先输入数字'''',''''提示:'''',0)

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