[c-prog] Re: explicit cast from char to int?

[abcpqr70]

--- In c-prog@yahoogroups.com, Paul Herring <pauljherr...@...> wrote:
>
> On Wed, May 6, 2009 at 10:59 AM, Jos Timanta Tarigan
> <jos_t_tari...@...> wrote:
> >
> > hi,
> >
> > so im currently try to read a binary file and try to represent it in rgb 
> > image. i save the
> > file into char[length] and then try to convert it to int to get 0-255 
> > value. is it ok to do it
> > explicitly eg. (int)thisChar ?
> 
> In all likelihood, no.
> 
> > i got an unexpected value and i wonder if that caused by it.
> 
> If by unexpected you mean negative you perhaps need an array of
> 
> unsigned char [length];
> 
> instead of
> 
> char[length];
> 
> Also check that you're opening the file for binary reads (as opposed
> to text or 'default' which is text on some systems.)
> 
> Otherwise you're going to have to explain a bit more.
> 
> -- 
> PJH
> 
> http://shabbleland.myminicity.com/com
> http://www.chavgangs.com/register.php?referer=9375
>
and i hope this ASCI value is the unexpected value you were talking about