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      NAN

      From cppreference.com
      <cpp‎ |numeric‎ |math
       
       
       
      Common mathematical functions
      Nearest integer floating point operations
      (C++11)(C++11)(C++11)
      (C++11)
      (C++11)
      (C++11)(C++11)(C++11)
      Floating point manipulation functions
      (C++11)(C++11)
      (C++11)
      (C++11)
      Classification and comparison
      (C++11)
      (C++11)
      (C++11)
      (C++11)
      (C++11)
      (C++11)
      Types
      (C++11)
      (C++11)
      (C++11)
      Macro constants
       
      Defined in header<cmath>
      #define NAN /*implementation defined*/
      (since C++11)

      The macroNAN expands to constant expression of typefloat which evaluates to a quiet not-a-number (QNaN) value. If the implementation does not support QNaNs, this macro constant is not defined.

      [edit]Notes

      There are many different NaN values, differentiated by their payloads and their sign bits. The contents of the payload and the sign bit of the NaN generated by the macroNAN are implementation-defined.

      [edit]See also

      (C++11)(C++11)(C++11)
      not-a-number (NaN)
      (function)[edit]
      (C++11)
      checks if the given number is NaN
      (function)[edit]
      identifies floating-point types that can represent the special value "quiet not-a-number" (NaN)
      (public static member constant ofstd::numeric_limits<T>)[edit]
      identifies floating-point types that can represent the special value "signaling not-a-number" (NaN)
      (public static member constant ofstd::numeric_limits<T>)[edit]
      [static]
      returns a quiet NaN value of the given floating-point type
      (public static member function ofstd::numeric_limits<T>)[edit]
      returns a signaling NaN value of the given floating-point type
      (public static member function ofstd::numeric_limits<T>)[edit]
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/numeric/math/NAN&oldid=139144"

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