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:='';
        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:='432423';
        end;
    j:='3432';
end;

procedure TForm1.Button14Click(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:='X';
            i:='';
        end;

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

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

        if s_characterlast='/' then
         begin
             edit1.Text:=floattostr(strtofloat(s_number) / strtofloat(edit1.Text ));
             s_number:=edit1.text;
             s_characterlast:='X';
            i:='';
         end;
   end
//**************//
    else
        begin
           s_characterlast:='X';
           s_number:=edit1.Text;
            i:='34342';
        end; 
    j:='3432';
end;

procedure TForm1.Button15Click(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:='3432';
        end;
    j:='3432';
end;

procedure TForm1.Button17Click(Sender: TObject);
begin
close;
end;

procedure TForm1.Button16Click(Sender: TObject);
begin
if s_type='1' then
  if (edit1.Text='')   then
  begin
  edit1.Text:=edit1.Text+'0.';
  s:='123';
  j:=''; end
  else
  begin
  edit1.Text:=edit1.Text+'.';
  s:='123'; end
else  begin
  if (j<>'') then
  begin
  edit1.text:='';
  edit1.Text:=edit1.Text+'0.';
   s_type:='1';
  j:='';
  end else
  begin
  edit1.text:='';
  edit1.text:=edit1.Text+'.';
  s_type:='1';
  end;
end;
end;

procedure TForm1.Button11Click(Sender: TObject);
begin
//=======================================//
    s_type:='0';
  if  s='' then

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

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

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

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

procedure TForm1.FormShow(Sender: TObject);
begin
j:='';
s_type:='1';
end;

procedure TForm1.Button18Click(Sender: TObject);
begin
  edit1.text:='';
end;

end.