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)
else
  if  i<>'''''''' then
  begin
        if s_characterlast=''''X'''' then
         begin
            edit1.Text:=floattostr(strtofloat(s_number) * strtofloat(edit1.Text ));
            s_number:=edit1.text;
            s_characterlast:=''''+'''';
            i:='''''''';
        end;

       if s_characterlast=''''+'''' then
        begin
            edit1.Text:=floattostr(strtofloat(s_number) + strtofloat(edit1.Text ));
            s_number:=edit1.text;
            s_characterlast:=''''+'''';
            i:='''''''';
       end;

        if s_characterlast=''''-'''' then
       begin
            edit1.Text:=floattostr(strtofloat(s_number) - strtofloat(edit1.Text ));
            s_number:=edit1.text;
            s_characterlast:=''''+'''';
            i:='''''''';
       end;

        if s_characterlast=''''/'''' then
         begin
             edit1.Text:=floattostr(strtofloat(s_number) / strtofloat(edit1.Text ));
             s_number:=edit1.text;
             s_characterlast:=''''+'''';
            i:='''''''';
         end;
   end
//**************//
    else
        begin
           s_characterlast:=''''+'''';
           s_number:=edit1.Text;
           i:=''''8567'''';
        end; 
    j:=''''3432'''';
end;

procedure TForm1.Button13Click(Sender: TObject);
begin
  s_type:=''''0'''';
  if  s='''''''' then

    application.MessageBox(''''请先输入数字'''',''''提示:'''',0)
else
  if  i<>'''''''' then
  begin
        if s_characterlast=''''X'''' then
         begin
            edit1.Text:=floattostr(strtofloat(s_number) * strtofloat(edit1.Text ));
            s_number:=edit1.text;
            s_characterlast:=''''-'''';
            i:='''''''';
&n

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