[Haskell-cafe] Why this exception occurs ?

[L.Guo]

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