How can I compute the range of signed and unsigned types

[kragen at pobox.com]

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.