How can I compute the range of signed and unsigned types
kragen at pobox.com
kragen at pobox.com
Sat May 5 00:17:40 PDT 2001
James Cownie <jcownie at etnus.com> writes:
> Jag wrote : -
> > Those sizes are defined for the C language. In order words, no
> > matter if you're on a 32-bit machine or a 64-bit machine, an int is
> > always going to be 32-bit and thus have the same numeric range
>
> No, the C standard says nothing of the sort.
>
> All the C standard says is that
>
> 1) sizeof (char) == 1
> 2) sizeof (short) >= sizeof (char)
> 3) sizeof (int) >= sizeof (short)
> 4) sizeof (long) >= sizeof (int)
> 5) sizeof (long long) >= sizeof (long).
>
> It also does not specify that the representation of an int is two's
> complement, so even on machines with the same sizeof(int) the legal
> ranges could differ.
It also says sizeof(short) >= 2 and sizeof(long) >= 4, IIRC, and the
old ANSI C standard didn't say anything about long long. I haven't
read C9X.
More information about the Beowulf
mailing list