我做一个计算器,实现加法,代码如下:procedure TForm1.pluseClick(Sender: TObject);
begin
s:=0;
edit1.Text:= edit1.Text+ (sender as Tbutton).Caption;
s:=strtoint(edit1.text);
edit1.Text:='';end
公共事件出现错误:(sender as Tbutton).Caption,怎么办?
begin
s:=0;
edit1.Text:= edit1.Text+ (sender as Tbutton).Caption;
s:=strtoint(edit1.text);
edit1.Text:='';end
公共事件出现错误:(sender as Tbutton).Caption,怎么办?
(sender as Tbutton).Caption?????
edit1.Text:= edit1.Text+ TButton(sender).Caption;
begin
s:=0;
edit1.Text:= edit1.Text+ (sender as Tbutton).Caption;
s:=strtoint(edit1.text);
edit1.Text:='';end;
(sender as Tbutton).Caption就是我点击计算器上的0~9的按钮的caption赋给edit1,“procedure TForm1.pluseClick(Sender: TObject);”这是我点击加号时触发的事件。运行时候事件出现错误,不知道该怎么改?
LZ点击加号触发该事件,那么此时sender应该是加号按钮吧
所以edit1.Text:= edit1.Text+ (sender as Tbutton).Caption;
edit1.text := edit1.text + '+'
iFirst: Integer;
1,点击0。。9中一个,edit1.text := TButton(Sender).Caption;
2, 点击+
3,点击0。。9中一个,iFirst := StrToInt(edit1.text);
edit1.text := TButton(Sender).Caption;
4, 点击= edit1.text := IntToStr(iFirst + StrToInt(edit.text ));
大概思路应该是这样的吧