On Nov 20, 10:23 am, "Mark H." <[EMAIL PROTECTED]> wrote:
> I can't speak from Rich but I've noticed this behavior in other Lisp
> implementations (like SBCL) that are built on C. The Lisp
> implementation changes the semantics of floating-point divide-by-
> zero. (The ANSI Common Lisp standard defines the DIVISION-BY-ZERO
> condition --
> seehttp://www.lispworks.com/documentation/HyperSpec/Body/e_divisi.htm#di...
> -- but I can't tell whether it _requires_ that floating-point 1.0/0.0,
> for example, signal a condition or just return Inf.)
Bit off topic here, but there is no standard common lisp semantics for
divide by zero:
"Exceptional Situations:
The consequences are unspecified if any argument other than the first
is zero. If there is only one argument, the consequences are
unspecified if it is zero.
Might signal type-error if some argument is not a number. Might signal
division-by-zero if division by zero is attempted. Might signal
arithmetic-error."
from: <http://www.lispworks.com/documentation/HyperSpec/Body/
f_sl.htm>
IOW, implementations are free to signal a division-by-zero condition,
but are not required to.
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