Re: [Haskell-cafe] Re: 0/0 > 1 == False

On Thu, Jan 10, 2008 at 09:41:53PM +0100, Achim Schneider wrote:

David Roundy wrote:

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On Thu, Jan 10, 2008 at 09:24:34PM +0100, Achim Schneider wrote:

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John Meacham wrote:

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1/0 = Infinity -1/0 = -Infinity

Just out of curiosity:

1/-0 = -Infinity? -1/-0 = Infinity?

Yes. (You could have tried this for yourself, you know... but I suppose haskell-cafe isn't a bad interactive Haskell interpreter, perhaps more user friendly than ghci.)

Prelude> 1 `div` 0 *** Exception: divide by zero

That's it. One just shouldn't just extrapolate and think you didn't mean GHC but IEEE...

Prelude> 1/(-0) -Infinity You need to use the / operator, if you want to do floating-point division. -- David Roundy Department of Physics Oregon State University