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NNTP-Posting-Date: Sun, 09 Apr 2017 14:53:54 -0500
From: Gareth Owen <gwowen@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: And they say C is obscure
References: <20170409-035940.754.0@Peabody.ssl.astraweb.com> <ocdtn3$j5q$1@dont-email.me>
Date: Sun, 09 Apr 2017 20:53:54 +0100
Message-ID: <8760idxsq5.fsf@gmail.com>
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Xref: csiph.com comp.lang.c:107953

James Kuyper <jameskuyper@verizon.net> writes:

> On 04/08/2017 11:59 PM, Peabody wrote:
> ...
>> And while I'm at it, let me ask how you would create an unsigned byte array 
>> exactly 2048 bytes long, and fill it with FFs.
>
> #include <string.h>
>
> unsigned char array[2048];
>
>     memset(array, 0xFF, sizeof array);
>
> Note: the #include should be at file scope. The call to memset() must
> occur inside a function. The declaration for array could occur either
> inside or outside a function.


*Warning for Peabody*

void set_to_0xff(char array[2048])
{
  memset(array, 0xFF, sizeof array);
}

main()
{
  char my_arr[2048];
  set_to_0xff(my_arr);
}

will not work.  A (IMHO truly horrible but mostly forgiveable)
historical anomaly of the language design.