Znaci treba da napravim kalkulator koji izgleda ovako:

Napisao sam kod za racunske operacije ali kad kliknem RUN pojavi se ova poruka:

Evo ga kompletan kod:
- unit Unit1;
-
- interface
-
- uses
- Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
- Dialogs, StdCtrls;
-
- type
- TForm1 = class(TForm)
- Edit1: TEdit;
- Edit2: TEdit;
- rez: TEdit;
- Label1: TLabel;
- Label2: TLabel;
- Label3: TLabel;
- ComboBox1: TComboBox;
- Button1: TButton;
- procedure Button1Click(Sender: TObject);
- procedure ComboBox1Change(Sender: TObject);
- private
- { Private declarations }
- public
- { Public declarations }
- end;
-
- var
- Form1: TForm1;
-
- implementation
-
- {$R *.dfm}
-
- procedure TForm1.Button1Click(Sender: TObject);
- begin
- close
- end;
-
- procedure TForm1.ComboBox1Change(Sender: TObject);
- begin
- case combobox1.itemindex of
- 0:rez.text:=floattostr(strtofloat(edit1.Text)+strtofloat(edit2.Text));
- 1:rez.text:=floattostr(strtofloat(edit1.Text)-strtofloat(edit2.Text));
- 2:rez.text:=floattostr(strtofloat(edit1.Text)*strtofloat(edit2.Text));
- 3:if(strtofloat(edit2.Text)=0)
- then begin
- showmessage('deljenje nulom');edit2.SetFocus;
- end
- else rez.Text:=floattostr(strtofloat(edit1.Text)/strtofloat(edit2.Text));
-
- end
-
- end.
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