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It's OK to compare floating-points for equality (lisyarus.github.io)

submitted 20 hours ago by soc@programming.dev to c/programming@programming.dev

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[–] MonkderVierte@lemmy.zip 12 points 19 hours ago* (last edited 19 hours ago) (1 children)

Say, you have a turn-based game where units move on a grid. … Then you realize that the move finishes exactly when the position of the unit coincides with the target cell's center.

I mean, something like inbetween(target - cellRadius, target + cellRadius), no?

And of course you first (and generally) convert the floating points to units you can actually work with, why is this even a question? Anyone who knew KSP as more than a rocket explosion simulator, learned that lession long ago from the Kraken.

[–] Blue_Morpho@lemmy.world 8 points 18 hours ago

That's one case study. He lists many more where throwing an epsilon at a floating point problem is the wrong solution.