
floating point - Why is NaN not equal to NaN? - Stack Overflow
NaN is designed to propagate through all calculations, infecting them like a virus, so if somewhere in your deep, complex calculations you hit upon a NaN, you don't bubble out a seemingly …
NaN是什么 NaN == NaN 的结果是什么?为什么? - 知乎
NaN通常用于表示数学运算无法产生有意义的结果的情况,例如0除以0或对负数求平方根等。 NaN与任何其他值(包括NaN本身)进行比较的结果都是false,包括NaN == NaN。这是因 …
How do you check that a number is NaN in JavaScript?
2010年4月16日 · NaN === NaN; // false Number.NaN === NaN; // false isNaN(NaN); // true isNaN(Number.NaN); // true Equality operator (== and ===) cannot be used to test a value …
What is NaN (Not a Number) in the words of a beginner?
2019年12月14日 · In computing, NaN, standing for not a number, is a member of a numeric data type that can be interpreted as a value that is undefined or unrepresentable, especially in …
What's the difference between nan, NaN and NAN - Stack Overflow
2013年7月24日 · Different operating systems and programming languages may have different string representations of NaN: nan NaN NaN% NAN NaNQ NaNS qNaN sNaN 1.#SNAN …
javascript - Why is NaN === NaN false? - Stack Overflow
Why does NaN === NaN return false in Javascript? > undefined === undefined true > NaN === NaN false > a = NaN NaN > a === a false On the documentation page I see this: Testing …
In Java, what does NaN mean? - Stack Overflow
2010年4月11日 · if NaN is the input of a floating operation, the output also tends to be NaN. there are several possible values for NaN 0x7fc00000, 0x7fc00001, 0x7fc00002, although x86_64 …
python - How to check for NaN values - Stack Overflow
2023年7月13日 · A NaN implemented following the standard, is the only value for which the inequality comparison with itself should return True: def is_nan(x): return (x != x) And some …
Why does typeof NaN return 'number'? - Stack Overflow
The best way to think of NAN is that its not a known number. Thats why NAN != NAN because each NAN value represents some unique unknown number. NANs are necessary because …
What is the difference between NaN and None? - Stack Overflow
2013年7月9日 · NaN can be used as a numerical value on mathematical operations, while None cannot (or at least shouldn't). NaN is a numeric value, as defined in IEEE 754 floating-point …