unit1.pas

Small calculator to realize simple calculation functions, interface more

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    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;
    Button16: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(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 Button16Click(Sender: TObject);
    procedure Button11Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  temp1:string;
  temp2:real;
  n:integer;
implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  edit1.Text:=edit1.Text+'1'

end;

procedure TForm1.Button2Click(Sender: TObject);
begin
   edit1.Text:=edit1.Text+'2'
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  edit1.Text:=edit1.Text+'3'
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
   edit1.Text:=edit1.Text+'4'
end;

procedure TForm1.Button5Click(Sender: TObject);
begin
  edit1.Text:=edit1.Text+'5'
end;

procedure TForm1.Button6Click(Sender: TObject);
begin
  edit1.Text:=edit1.Text+'6'
end;

procedure TForm1.Button7Click(Sender: TObject);
begin
 edit1.Text:=edit1.Text+'7'
end;

procedure TForm1.Button8Click(Sender: TObject);
begin
    edit1.Text:=edit1.Text+'8'
end;

procedure TForm1.Button9Click(Sender: TObject);
begin
 edit1.Text:=edit1.Text+'9'
end;

procedure TForm1.Button10Click(Sender: TObject);
begin
 edit1.Text:=edit1.Text+'0'
end;

procedure TForm1.Button12Click(Sender: TObject);
begin
   edit1.Clear
end;

procedure TForm1.Button13Click(Sender: TObject);
begin
   n:=1;
   temp1:=edit1.Text;
   edit1.Clear;
end;

procedure TForm1.Button14Click(Sender: TObject);
begin
   n:=2;
   temp1:=edit1.Text;
   edit1.Clear;
end;

procedure TForm1.Button15Click(Sender: TObject);
begin
   n:=3;
   temp1:=edit1.Text;
   edit1.Clear;
end;

procedure TForm1.Button16Click(Sender: TObject);
begin
   n:=4;
   temp1:=Edit1.Text;
   edit1.Clear;
end;
 procedure TForm1.Button11Click(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('除数为零!');
Exit;
end
else
temp2:=StrToFloat(temp1)/StrToFloat(edit1.Text);
end;
edit1.Text:=FloatToStr(temp2);
end;




end.