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1. stackoverflow.com › questions › 570669Checking if a double (or float) is NaN in C++ - Stack Overflow

   stackoverflow.com › questions › 570669

   Feb 21, 2009 · nan results from the operation 0.f/0.f, or 0.0/0.0. nan is a terrible nemesis to the stability of your code that must be detected and prevented very carefully 1. The properties of nan that are different from normal numbers: nan is toxic, (5*nan=nan) nan is not equal to anything, not even itself (nan!= nan) nan not greater than anything (nan!> 0)

2. www.geeksforgeeks.org › nan-in-cpp-what-is-it-andNaN in C++ - What is it and How to Check For it ...

   www.geeksforgeeks.org › nan-in-cpp-what-is-it-and

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   Feb 6, 2023 · NaN, an acronym for Not a Number is an exception that usually occurs in the cases when an expression results in a number that is undefined or can’t be represented. It is used for floating-point operations. For example: The square root of negative numbers; Division by zero; Taking the log of zero or a negative number etc.

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4. stackoverflow.com › questions › 1923837math - How to use nan and inf in C? - Stack Overflow

   stackoverflow.com › questions › 1923837

   Dec 18, 2009 · NAN may or may not be defined, and "is defined if and only if the implementation supports quiet NaNs for the float type. It expands to a constant expression of type float representing a quiet NaN." Note that if you're comparing floating point values, and do: a = NAN; even then, a == NAN; is false. One way to check for NaN would be:

5. en.cppreference.com › w › cppNAN - cppreference.com

   en.cppreference.com › w › cpp

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   Mar 31, 2022 · Defined in header <cmath>. #define NAN /*implementation defined*/. (since C++11) The macro NAN expands to constant expression of type float which evaluates to a quiet not-a-number (QNaN) value. If the implementation does not support QNaNs, this macro constant is not defined.

6. en.cppreference.com › w › cppstd::isnan - cppreference.com

   en.cppreference.com › w › cpp

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   Aug 8, 2023 · std:: isnan. 1) Determines if the given floating point number num is a not-a-number (NaN) value. The library provides overloads for all cv-unqualified floating-point types as the type of the parameter num.(since C++23) A) Additional overloads are provided for all integer types, which are treated as double.

7. alexsyniakov.com › 2024/03/20 › understanding-nanUnderstanding NaN Numbers in C++ and their properties

   alexsyniakov.com › 2024/03/20 › understanding-nan

   Mar 20, 2024 · Furthermore, NaN values can be explicitly created in C++ using std::nan(const char*) or std::numeric_limits<double>::quiet_NaN(). Properties of NaN. One of the defining characteristics of NaN is its behavior during comparisons. Any comparison of a NaN value, even with itself, using the equality operator ==, returns false. This is illustrated by:

8. People also ask

   Can I generate a NaN with a floating-point operation?

   • For freestanding C implementations (on which the header may not be available) or when the NAN macro is not defined (which might happen even though NaN's may be supported), one can generate a NaN with a floating-point operation such as 0.0 / 0.0. However, there may be several issues with it.

   floating point - How to produce a NaN float in c? - Stack Overflow

   stackoverflow.com/questions/7212356/how-to-produce-a-nan-float-in-c

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   What is Nan in C++?

   • NaN in C++ – What is it and How to Check For it? NaN, an acronym for Not a Number is an exception that usually occurs in the cases when an expression results in a number that is undefined or can’t be represented. It is used for floating-point operations. For example: Time Complexity: O (1) Space Complexity: O (1) How to check for NaN in C++?

   NaN in C++ - What is it and How to Check For it? - GeeksforGeeks

   www.geeksforgeeks.org/nan-in-cpp-what-is-it-and-how-to-check-for-it/

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   How do I check if a float has a quiet NaN?

   • NAN may or may not be defined, and "is defined if and only if the implementation supports quiet NaNs for the float type. It expands to a constant expression of type float representing a quiet NaN." Note that if you're comparing floating point values, and do: even then, is false. One way to check for NaN would be: if (isnan(a)) { ...

   math - How to use nan and inf in C? - Stack Overflow

   stackoverflow.com/questions/1923837/how-to-use-nan-and-inf-in-c

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   What is a float Nan macro?

   • Macro: float NAN An expression representing a value which is “not a number”. This macro is a GNU extension, available only on machines that support the “not a number” value—that is to say, on all machines that support IEEE floating point. You can use ‘#ifdef NAN’ to test whether the machine supports NaN.

   floating point - How to produce a NaN float in c? - Stack Overflow

   stackoverflow.com/questions/7212356/how-to-produce-a-nan-float-in-c

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   How to check for Nan in C++?

   • Method 1: Using compare (“==”) operator. In this method, we check if a number is complex by comparing it with itself. If the result is true, then the number is not complex i.e., real. But if the result is false, then “nan” is returned, i.e. the number is complex. Time Complexity: O (1) Space Complexity: O (1)

   NaN in C++ - What is it and How to Check For it? - GeeksforGeeks

   www.geeksforgeeks.org/nan-in-cpp-what-is-it-and-how-to-check-for-it/

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   What does Nan mean in JavaScript?

   • nan results from the operation 0.f/0.f, or 0.0/0.0. nan is a terrible nemesis to the stability of your code that must be detected and prevented very carefully 1. The properties of nan that are different from normal numbers:

   Checking if a double (or float) is NaN in C++ - Stack Overflow

   stackoverflow.com/questions/570669/checking-if-a-double-or-float-is-nan-in-c

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9. lucid.co › techblog › 2022/03/04If it’s not a number, what is it? Demystifying NaN for the ...

   lucid.co › techblog › 2022/03/04

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   Mar 4, 2022 · Short for "Not a Number", even its name is a paradox. Only floating-point values can be NaN, meaning that from a type-system point of view, only numbers can be "not a number". NaN's actual behavior is even stranger, though. The most spectacular bit of weirdness is that NaN is not equal to itself.