Heh, talk about overflow behavior. Here's what GHC does on my 64 bit machine. Note: you need to turn on -fglasgow-exts to force the types this way interactively. As for the tutorials, I have like 10 of them open in different Firefox tabs to different places. Mostly I've been reading up on IO, Monads and other advanced stuff while ignoring basic things I probably should have learned first. Prelude> let i::Int = 2^62 Prelude> i 4611686018427387904 Prelude> let i::Int = 2^63 Prelude> i -9223372036854775808 Prelude> let i::Int = 2^64 Prelude> i 0 Prelude> let i::Int = 2^100 Prelude> i 0 Clearly a job for Integer. -Greg ----- Original Message ---- From: Stefan O'Rear <stefanor@cox.net> To: Andrew Coppin <andrewcoppin@btinternet.com> Cc: haskell-cafe@haskell.org Sent: Thursday, July 12, 2007 11:48:15 AM Subject: Re: [Haskell-cafe] Simple newbie question - Int and Integer On Thu, Jul 12, 2007 at 07:39:09PM +0100, Andrew Coppin wrote:

Gregory Propf wrote:

...

So what the hell is the difference between them? Int and Integer. They aren't synonyms clearly. What's going on?

Int = 32-bit integer.

Int = 30 bits with undefined overflow behavior That "undefined" gives implementations the freedom to use bigger representations if convenient. GHC: 31, 32 or 64 bits (from source code) Hugs: 32 bits (only tested on a 32 bit computer) YHC: 32 or 64 bits (from source code) JHC: Buggy (maxBound :: Int is negative) Stefan _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ____________________________________________________________________________________ Bored stiff? Loosen up... Download and play hundreds of games for free on Yahoo! Games. http://games.yahoo.com/games/front