-3
我也跟着這樣:http://delphi.wikia.com/wiki/Simple_Calculator_Tutorial德爾福錯誤:Equals.Caption:=;表達期待但'''發現
這是我在Delphi代碼:
unit Unit3;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, ExtCtrls;
type
TForm3 = class(TForm)
Addition: TButton;
Subtraction: TButton;
Multiplication: TButton;
Division: TButton;
One: TButton;
Two: TButton;
Three: TButton;
Four: TButton;
Five: TButton;
Six: TButton;
Seven: TButton;
Eight: TButton;
Nine: TButton;
Zero: TButton;
Decimal: TButton;
Enter: TButton;
ClearValue: TButton;
Panel1: TPanel;
Negative: TButton;
Reset: TButton;
NumberEdit: TEdit;
Equals: TLabel;
procedure NegativeClick(Sender: TObject);
procedure AdditionClick(Sender: TObject);
procedure SubtractionClick(Sender: TObject);
procedure MultiplicationClick(Sender: TObject);
procedure DivisionClick(Sender: TObject);
procedure EnterClick(Sender: TObject);
procedure ClearValueClick(Sender: TObject);
procedure ResetClick(Sender: TObject);
procedure NumberEditChange(Sender: TObject);
procedure NumberButtonClick (Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form3: TForm3;
implementation
{$R *.DFM}
var
FNumber : real;
Math : string;
procedure TForm3.NumberButtonClick(Sender: TObject);
begin
NumberEdit.Text := NumberEdit.Text + (Sender as TButton).Caption;
end;
procedure TForm3.NegativeClick(Sender: TObject);
var
OriginalNumber: real;
TextNumber: string;
begin
OriginalNumber := -(StrToFloat(NumberEdit.Text));
TextNumber := FormatFloat('0.##########', OriginalNumber);
NumberEdit.Text := TextNumber
end;
procedure TForm3.AdditionClick(Sender: TObject);
begin
Math := 'Add';
FNumber := StrToFloat(NumberEdit.Text);
NumberEdit.Clear;
end;
procedure TForm3.SubtractionClick(Sender: TObject);
begin
Math := 'Subtract';
FNumber := StrToFloat(NumberEdit.Text);
NumberEdit.Clear;
end;
procedure TForm3.MultiplicationClick(Sender: TObject);
begin
Math := 'Multiply';
FNumber := StrToFloat(NumberEdit.Text);
NumberEdit.Clear;
end;
procedure TForm3.DivisionClick(Sender: TObject);
begin
Math := 'Divide';
FNumber := StrToFloat(NumberEdit.Text);
NumberEdit.Clear;
end;
procedure TForm3.EnterClick(Sender: TObject);
var
Answer, SNumber : real;
Text : string;
begin
SNumber := StrToFloat(NumberEdit.Text);
begin
if Math = 'Add' then
Answer := FNumber + SNumber;
Text := FormatFloat('0.#####', Answer);
Equals.Caption := '= ' + Text;
NumberEdit.Clear;
end;
begin
if Math = 'Subtract' then
Answer := FNumber - SNumber;
Text := FormatFloat('0.#####', Answer);
Equals.Caption := '= ' + Text;
NumberEdit.Clear;
end;
begin
if Math = 'Multiply' then
Answer := FNumber * SNumber;
Text := FormatFloat('0.#####', Answer);
Equals.Caption := '= ' + Text;
NumberEdit.Clear;
end;
begin
if Math = 'Divide' then
Answer := FNumber/SNumber;
Text := FormatFloat('0.#####', Answer);
Equals.Caption := '= ' + Text;
NumberEdit.Clear;
end;
end;
procedure TForm3.ClearValueClick(Sender: TObject);
begin
NumberEdit.Clear;
end;
procedure TForm3.ResetClick(Sender: TObject);
begin
Equals.Caption := ;
NumberEdit.Clear;
FNumber := 0;
SNumber := 0;
Math := 'Default';
end;
end.
這是我收到錯誤的截圖:
請不要使用截圖。只需在代碼中標記(例如用'// < - 這裏是錯誤')的註釋,就可以在錯誤發生的地方進行標記。 –
或更好的是,在消息窗口中右鍵單擊,然後從菜單中選擇*複製*,然後將其作爲文本粘貼到您的帖子中。只有在沒有其他方式可以說明問題時才應使用圖像,而這種情況並非如此。 –