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From: "Rod Pemberton" <do_not_have AT noavailemail DOT cmm>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Array initialization question
Date: Sat, 27 Aug 2011 03:08:00 -0400
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"Mok-Kong Shen" <mok-kong DOT shen AT t-online DOT de> wrote in message
news:j393ip$q9n$1 AT news DOT albasani DOT net...
> I found that lines like
>
>    const int sz=3;
>    int arr[sz];
>
> seem to work well as C code.

This is a C99 feature.

Two links on VLAs follow.

#33 mentions VLAs
http://home.datacomm.ch/t_wolf/tw/c/c9x_changes.html

There is also a section on VLAs here:
http://david.tribble.com/text/cdiffs.htm

Both links also cover the C struct hack.

> However I can't have an initialization list
> e.g.
>
>    int arr[sz]={ 0,1,2 };
>

Why would you need a variable-length array with a fixed quantity of array
items?  Does that make sense to you?

Is there something wrong with:

  int arr[3]={0,1,2};

> On the other hand such initialization lists seem to be ok for codes
> running in Visual C++. Is this due to a difference between standards
> of C and C++?

The second link says:

  "C++ does not support VLAs"

So, I would wonder why VC++ supports VLAs.


Rod Pemberton