https://toorun.dev/tags/ieee-754/Recent content in ieee-754 on toorun.devHugo -- gohugo.ioen-usSat, 19 Sep 2026 09:00:00 +0000https://toorun.dev/posts/nan-in-practice-what-it-is-when-to-use-it-and-how-to-parse-it-safely/Sat, 19 Sep 2026 09:00:00 +0000https://toorun.dev/posts/nan-in-practice-what-it-is-when-to-use-it-and-how-to-parse-it-safely/NaN in Practice: What It Is, When to Use It, and How to Parse It Safely What is NaN? NaN means “Not a Number.” It is the standard floating-point result for invalid math, defined by the IEEE 754 standard. Examples: 0 / 0 sqrt(-1) log(-10) inf - inf The important rule: NaN is not equal to anything, including itself. x = float('nan') print(x == x) # False That is why NaN is useful as a signal, but dangerous if you forget to check it.