Signed int -0 ?

[Victor Bazarov]

Re: Signed int -0 ?

"Ron Natalie" <ron@sensor.com > wrote...[color=blue]
>
> "Jack Klein" <jackklein@spam cop.net> wrote in message[/color]
news:2c0agv8eek oificl7rmqab2tp arvn5scsr@4ax.c om...[color=blue]
>[color=green]
> > There are three defined formats for the representation of negative
> > signed integer values.[/color]
>
> Only in C99.[/color]

What is that supposed to mean? The representation of negative
integers is not language-specific, it's hardware-specific.

[Ron Natalie]

Re: Signed int -0 ?


"Victor Bazarov" <v.Abazarov@att Abi.com> wrote in message news:vgiuhdtd04 uc26@corp.super news.com...[color=blue]
> "Ron Natalie" <ron@sensor.com > wrote...[color=green]
> >
> > "Jack Klein" <jackklein@spam cop.net> wrote in message[/color]
> news:2c0agv8eek oificl7rmqab2tp arvn5scsr@4ax.c om...[color=green]
> >[color=darkred]
> > > There are three defined formats for the representation of negative
> > > signed integer values.[/color]
> >
> > Only in C99.[/color]
>
> What is that supposed to mean? The representation of negative
> integers is not language-specific, it's hardware-specific.
>[/color]
C99 defines (well limits the allowable) integer formats to three (signed mag, 1's comp.,
and 2's comp.). There is NO such restriction in C++. Any encoding that meets the
requirement that the positive numbers share representation with the corresponding unsigned
type meets the requirement.

[Victor Bazarov]

Re: Signed int -0 ?

"Ron Natalie" <ron@sensor.com > wrote...[color=blue]
>
> "Victor Bazarov" <v.Abazarov@att Abi.com> wrote in message[/color]
news:vgiuhdtd04 uc26@corp.super news.com...[color=blue][color=green]
> > "Ron Natalie" <ron@sensor.com > wrote...[color=darkred]
> > >
> > > "Jack Klein" <jackklein@spam cop.net> wrote in message[/color]
> > news:2c0agv8eek oificl7rmqab2tp arvn5scsr@4ax.c om...[color=darkred]
> > >
> > > > There are three defined formats for the representation of negative
> > > > signed integer values.
> > >
> > > Only in C99.[/color]
> >
> > What is that supposed to mean? The representation of negative
> > integers is not language-specific, it's hardware-specific.
> >[/color]
> C99 defines (well limits the allowable) integer formats to three (signed[/color]
mag, 1's comp.,[color=blue]
> and 2's comp.). There is NO such restriction in C++. Any encoding[/color]
that meets the[color=blue]
> requirement that the positive numbers share representation with the[/color]
corresponding unsigned[color=blue]
> type meets the requirement.[/color]

Would you say, then, that C99 is smarter about it or that C++
is more flexible about it? AFAIK, there are no other schemes
than the three mentioned in this thread...

Victor

[Ron Natalie]

Re: Signed int -0 ?


"Victor Bazarov" <v.Abazarov@att Abi.com> wrote in message news:vgj6q1arp7 lt1f@corp.super news.com...
..[color=blue]
>
> Would you say, then, that C99 is smarter about it or that C++
> is more flexible about it? AFAIK, there are no other schemes
> than the three mentioned in this thread...
>[/color]
Got me. I've never understood why they were suddenly enumerated
in C99. To my knowledge I've never worked on a signed-mag machine
and I haven't been near a 1's complement machine in over a decade.

[Alexander Terekhov]

Re: Signed int -0 ?


Ron Natalie wrote:
[...][color=blue]
> Got me. I've never understood why they were suddenly enumerated
> in C99. To my knowledge I've never worked on a signed-mag machine
> and I haven't been near a 1's complement machine in over a decade.[/color]

How about offset binary (aka "Excess-K"), various BCD schemes, uhmm,
and "gray code"? ;-)

regards,
alexander.

[Ron Natalie]

Re: Signed int -0 ?


"Alexander Terekhov" <terekhov@web.d e> wrote in message news:3F09B262.9 9C834AB@web.de. ..[color=blue]
>
> Ron Natalie wrote:
> [...][color=green]
> > Got me. I've never understood why they were suddenly enumerated
> > in C99. To my knowledge I've never worked on a signed-mag machine
> > and I haven't been near a 1's complement machine in over a decade.[/color]
>
> How about offset binary (aka "Excess-K"), various BCD schemes, uhmm,
> and "gray code"? ;-)
>[/color]
These aren't legal in C++ because they don't share the postitve number
representation with the unsigned.