Re: Java to C Structure Communication

One more comment on signeds...

You can sometimes get away with justs tuffing a C unsigned into
a Java int dependign on what your doing with it. Math and comparisons
wont be the same, but Java *does* have unsigned shift operators that work on
the int type.

Jeff Kesselman wrote:
> Patrick Schneider wrote:
>> I was under the impression that Java integral types are signed
>> two's-complement integers...
>>
>> What did you mean by this:
>>
>>
>>> Java int is an unsigned 32 bit number.
>>>
>>
>> ? ... or am I missing something?
>>
>
> Nope your right, brain fart.
>
> All Java ints are signed.
>
> So to do an unsigned, you need to go to a bigger type.
>
> If its already a 32 bit number, I guess youll need to read it as bytes
> and assemble it as
> a BigInt.  Or give uup on the high bit if your sure the numerbs never
> really get that high.
> Thats what I did for my NWN data loader, just truncated the unsigned to
> 31 bits.
>
> JK
>
>
> --
> =======================================================================
> Journalism 101: The difference between news and a press release
>
> News tells you what the reporter thinks is true.
>
> A press release tells you what a company wants *you* to think is true.
>
> Only bad reporters think the two are the same.
>
> ===================================
> This list is hosted by DevelopMentor®  http://www.develop.com
>
> View archives and manage your subscription(s) at
> http://discuss.develop.com


--
=======================================================================
Journalism 101: The difference between news and a press release

News tells you what the reporter thinks is true.

A press release tells you what a company wants *you* to think is true.

Only bad reporters think the two are the same.

===================================
This list is hosted by DevelopMentor®  http://www.develop.com

View archives and manage your subscription(s) at http://discuss.develop.com