How do I discover the lowest negative possible CGFloat?

Question

I know of these values:

• CGFloat.infinity, which is greater than
• CGFloat.greatestFiniteMagnitude, which is greater than
• CGFloat.leastNormalMagnitude, which is greater than
• CGFloat.leastNonzeroMagnitude, which is greater than
• 0

but it stops there... as far as I can tell. Where are the negative values? I imagine maybe it's as easy as placing a - before them, but then I worry that there might be strange exceptions.

How do I find the key negative numbers in CGFloat? Critically, the lowest negative non-infinite number.

Answer 1

Floating point numbers have a sign bit and negating them changes this sign bit to the opposite value (there is actually a negative zero).

Just put a minus before them. The negation is well defined.