In practice, I doubt we care about systems where it would not be natural
for int to be 32+ bits, but I still say it's best to say "long" if you
mean "be able to hold large numbers".

This is one of the few things in the FSF style guide I think is flatly wrong.
(They advocate not giving even a moment's thought to the idea of a system
where int is <32 bits.)

-s