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**Subject**: **Re: 5.1 and vc6**
**From**: Wim Couwenberg <w.couwenberg@...>
**Date**: Sat, 05 Mar 2005 12:01:16 +0100

`Another thing, related to the recent NaN discussion: the runtime libs of
``vc6 are broken in the sense that x ~= x is *false* for x a NaN. In fact
``x == y is *true* if either one of x or y is NaN. vc7 fixed this bug.
``In vc6 there is an _isnan function available in float.h or you could do
``something like
`
if x == 1 and x == 2 then ... -- x is NaN
--
Wim