[Haskell-cafe] Re: Just for a laugh...
u.stenzel at web.de
Sat Jun 2 07:30:02 EDT 2007
Andrew Coppin wrote:
> Note that the challenge asks for the "internal" bitmap representation of
> an IEEE double-precision integer
Actually it didn't. It asked for the machine's internal representation
of a double precision float, and you are not guaranteed that this
representation conforms to IEEE 7-whatsit. It is beyond me what you're
going to do with that unspecified representation, though.
> Did I mention that this is a silly challange yet?
Silly, yes. Challenge, no. We can do the same the C++ guy did, it's
only a question if we need to. Something close to this:
| import Foreign.Marshal
| import Foreign.Ptr
| import Data.Word
| valueToBytes :: Storable a => a -> IO [Word8]
| valueToBytes a = with a $ \p -> peekBytes (castPtr b) (sizeOf a)
Reversing the list and hammering it down to single bits is trivial after
Structure is _nothing_ if it is all you got. Skeletons _spook_ people if
they try to walk around on their own. I really wonder why XML does not.
-- Erik Naggum
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