Re: Is infinity equal to infinity?

Kevin@quitt.net (Kevin D. Quitt)
11 Jul 1998 23:42:56 -0400

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From: Kevin@quitt.net (Kevin D. Quitt)
Newsgroups: sci.math.num-analysis,comp.lang.c,sci.math,comp.compilers
Date: 11 Jul 1998 23:42:56 -0400
Organization: If was organized, would I be reading Net News?
Distribution: inet
References: 98-07-058 98-07-089
Keywords: arithmetic

> So it makes (practical) sense to say that "x == NaN" should be false
> (because "==" is a numerical comparison).


It is guaranteed to be false. The appropriate test for x having the value NaN
is (x == x) - which will be false if x is NaN.


>The result Inf - Inf = NaN also makes sense (for practical purposes),


It makes sense mathematically, since Inf - Inf can have any value.
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Kevin D Quitt USA 91351-4454
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