My answer to "implement fabs(), incorrectly". Seven and one third internet points to anyone who can say why it's incorrect, without looking up the spec. Hint: It's implementation defined. (Using C99 semantics because that's the only one I know reasonably well. :)https://twitter.com/oe1cxw/status/1144274172253822976 …
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There exists a representation of a negative double whose negation is also negative, i.e. a < 0 && -a < 0 holds true? I'm completely out of my depth.
No. That's only possible with twos-complement integers. But you are very close.
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-FLT_MIN is undefined? (only guessing, I think -INT_MIN was in any case..?)
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-INT_MIN = INT_MAX+1 = INT_MIN because in twos complement there's one more negative number than there are positive numbers. FLT_MIN is simply the smallest positive normalized float. There's no issue with -FLT_MIN afaik. Just the same number with sign bit flipped.
End of conversation
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