in reply to Re^3: reliably test integer size for portable bit-fiddling? (~0)in thread reliably test integer size for portable bit-fiddling?
$ perl -le "print log(~0+1)/log(2)" 32 [download]
or, to be safe
$ perl -e 'printf "%.0f\n", log(~0+1)/log(2)' 32 [download]
- tye