[erlang-questions] binary elements greater than 255
Igor Ribeiro Sucupira
igorrs@REDACTED
Sat Apr 26 04:02:37 CEST 2008
I think this is the classic situation "If you do it wrong, the
behaviour is undefined". :-)
(On the case at hand, it looks it's just taking the least significant
byte from the number)
In fact, maybe it should raise a warning when compiling a module with
this kind of code... (?)
On Fri, Apr 25, 2008 at 10:01 PM, Zvi <exta7@REDACTED> wrote:
>
> Hi Igor,
>
> I know that lately computer industry decided to switch from 6-bit to 8-bit
> bytes :), which when unsigned can hold values in range 0..255. But this
> wasn't my question. I asked, why Erlang compiler didn't return error, when
> you give it input like <<256>>. I think it's a bug.
>
> Zvi
>
>
> Igor Ribeiro Sucupira wrote:
> >
> > No.
> > If you use integers in a binary, each must be in the range [0, 255]
> > (1-byte).
> >
> > Igor.
> >
> > On Fri, Apr 25, 2008 at 7:44 PM, Zvi <exta7@REDACTED> wrote:
> >>
> >> Is this a bug?
> >> Zvi
> >> ------------------------------------------------------------
> >> Erlang (BEAM) emulator version 5.6 [smp:2] [async-threads:0]
> >>
> >> Eshell V5.6 (abort with ^G)
> >> 1>
> >> 1> <<0,255>>.
> >> <<0,255>>
> >> 2> <<0,256>>.
> >> <<0,0>>
> >> 3> <<0,257>>.
> >> <<0,1>>
> >> 4> <<0,65536>>.
> >> <<0,0>>
> >> 5> <<0,1111111111>>.
> >> <<0,199>>
> >> 6>
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