Hi Yoo,
You may try (display '("" "0" "" "0")), and you will find two whitepaces
between 0.
在 2013年4月19日星期五，Danny Yoo 写道：
> On Fri, Apr 19, 2013 at 5:44 PM, Kejia柯嘉 <w.ke...@gmail.com <javascript:;>>
> wrote:
> > Hi all,
> >
> > In DrRacket, why is there an extra empty string (`[]`between 0s) in
> > the list:`'("" "0" "" "0")`. This generates `([]0[][]0)`, instead of
> > `([]0[]0)`.
>
>
> Unfortunately, the question here is ambiguous. What are you trying to
> do? Can you show us the code you are using to distinguish the empty
> string? What expression are you trying to evaluate such that you get
> this list in the first place?
>
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