> Matti Aarnio <matti.aarnio@sonera.fi> wrote:
> > Jakub Jelinek <jj@sunsite.mff.cuni.cz> wrote:
> > ...
> > > long long is defined in ISO C9X, your above definition is no longer true.
> > >
> > > C9X clearly states in 6.2.1.1:
> > >
> > > - The rank of long long int shall be greater than the
> > > rank of long int, which shall be greater than the rank
> > > of int, which shall be greater than the rank of short
> > > int, which shall be greater than the rank of signed
> > > char.
> >
> > Interesting, so this tells that:
> >
> > rank(long long int) > rank(long int) > rank(int) > rank(short int) > rank(char)
> >
> > While following was the previous definition:
> >
> > rank(long long int) >= rank(long int) >= rank(int) >= rank(short int) >= rank(char)
> >
> >
> > Systems do exist where *all* of those have same size, but they are
> > usually programmed in Fortran-9X, require liquid cooling, and recognize
> > name "Cray" ...
>
> I don't see a precise definition of "rank", but I do see that there is a bit
> of confusion about "rank" vs. "size". To quote from 6.3.1.1 (not 6.2.1.1):
>
> -- No two signed integer types shall have the same rank, even if they have
> the same representation.
> -- The rank of long long int shall be greater than the rank of long int,
> which shall be greater than the rank of int, which shall be greater
> than the rank of short int, which shall be greater than the rank of
> signed char.
>
> The 1st bullet indicates that rank is independant of representation and if
> you look at the definitions within <limits.h> (5.2.4.2.1) you'll see that
> signed char is at least 8 bits long
> short int is at least 16 bits long
> int is at least 16 bits long
> long is at least 32 bits long
> long long is at least 64 bits long
>
That's not exactly the definitions I've learnt:
It should be assumed that:
char *is* 8 bits
short int *is* 16 bits
int is the size of int nativly handled by your CPU: can be anything
long *is* 32 bits
long long *is* 64 bits
>
> There is no prohibition against all of the integer types being the same length
> as long as the minimum requirements are meet.
>
> John Cochran
>
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Tell me if I made a mistake
François Désarménien
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