How can I compute the range of signed and unsigned types
hahn at coffee.psychology.mcmaster.ca
Wed Apr 18 11:22:42 PDT 2001
> > 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
> > because the standards say so. This goes for all the basic types,
> > not just int's.
> No, the C standard says nothing of the sort.
yes, it does, in section 18.104.22.168 (with an implementation's
version of the ranges in limits.h and float.h)
> 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).
well, in addition, char requires >=8 bits, short >=16, int >=16,
long >=32, and floats range 1e+-37.
regards, mark hahn.
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