When I was tring manually truncate data to Word8 to fill into ByteString, I got the exception. Thanks. Now I understand the reason for that exception. And I know it is no need to manually truncate data. ------------------ L.Guo 2007-05-25 ------------------------------------------------------------- From: Donald Bruce Stewart At: 2007-05-25 15:33:46 Subject: Re: [Haskell-cafe] Why this exception occurs ? dons:
leaveye.guo:
Hi.
In GHCi ver 6.6, why this happens ?
Prelude Data.ByteString> Data.ByteString.pack $! Prelude.map (`rem` 256) $ [0..511] "*** Exception: divide by zero
It's the use of `rem` on Word8, by the way:
Prelude> (0 `rem` 256) :: Data.Word.Word8 *** Exception: divide by zero
Sorry, I should clarify, think about how to represent: 256 :: Word8 ;-) -- Don