Re: [Haskell-cafe] 1/0

On 2008 Jun 16, at 19:18, David Roundy wrote:

On Mon, Jun 16, 2008 at 4:07 PM, Evan Laforge wrote:

...

Every other language throws an exception, even C will crash the program, so I'm guessing it's telling the processor / OS to turn these into signals, while GHC is turning that off. Or something. But then what about this note in Control.Exception:

That's just not true. It depends on how your system (compiler?) is configured, but the default on most systems that I've used is to return NaNs.

It's how the system FPU is configured; most FPU hardware on Unixlike systems let you configure the FPU behavior on a per-process basis, although the amount of configurability may vary. That said, the divide by zero exception you get in both C and Haskell is *integer* divide-by-zero. Floating is mandated by IEEE standard to produce Inf (but as said above, can usually be configured). -- brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery@kf8nh.com system administrator [openafs,heimdal,too many hats] allbery@ece.cmu.edu electrical and computer engineering, carnegie mellon university KF8NH