Re: from 32 to 64

stan wrote:
> On Fri, 31 Jul 2009 20:12:05 +0100 (BST)
> Patrick Dupre <pd520@xxxxxxxxxx> wrote:
>
>   
> > Hello,
> >
> > I do observe abnormal results with my applications
> >
> > Moving from a 32 to 64 bits architecture, using, c, C++, perl, is
> > they something that I should be aware of ? like size of the
> > float, integer ?
> >     
>
>
> Yes, in C and C++, shouldn't matter in perl.  If you search on 64 bit
> compatibility you will find articles.  There was a post on this list a
> long time ago about it also.
>
> Basically, there are special names that adjust depending on arch size.
>
>   
Some of the type sizes are different between 32-bit and 64-bit 
architectures, even between different 32-bit architectures. Other types 
are fixed, no matter what architecture you use.

A char, for instance, is always 8 bits or one byte. A Unicode char, if 
implemented, is 16 bits or two bytes.

An int is a "natural" integer, a.k.a. "word", for the CPU architecture, 
so 8, 16, 32 or 64 bits depending on the CPU.

More detail can be found here: 
http://en.wikipedia.org/wiki/C_variable_types_and_declarations, among 
other places.

Cheers,




--


Paul


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