>>23
There's a more-specific answer which is also correct if you feel like going for it. There's little point though because you can easily tell from the program output people have posted.
>>24
The exact values are platform specific, but it's going to be the same on current 64bit platforms (and 32bit as well) in common use. If you can tell me a compiler that does something differently on amd64 arch I'd love to hear about it. I'll tell you now that any compiler that doesn't agree with
>>13 is in violation of the spec.
(The part you probably think is implementation defined isn't, and it's a thing I wish was marked as incorrect in the spec.)