[mschuetz]

>> You can say it, but that won't make it true. They can do it, and they do do it. Your comment is so much nonsense. The algorithm computers use to add 0.1 and 0.2 is the same algorithm that you use, which is, unsurprisingly, why they produce correct results.

Are you aware of floating point math? That's what most languages, and almost all languages aimed at performance, use. It's defined in the IEEE 754 standard and supported on a hardware level in many devices.

Here is a listing of the result of 0.1 + 0.2 in various languages: https://0.30000000000000004.com/

As the URL already indicates, most languages, including C, Rust, C++, Java, Javascript, Clojure, FORTRAN, Python, etc. evaluate this to 0.30000000000000004. I'm fine with this, I need fast rather than precise math. But it's not "correct".