from 32 to 64

[Paul]

stan wrote:
> On Fri, 31 Jul 2009 20:12:05 +0100 (BST)
> Patrick Dupre <pd520 at york.ac.uk> 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