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# NAN

From cppreference.com
< cpp‎ | numeric‎ | math

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.

### [edit] See also

quiet_NaN [static] | returns a quiet NaN value of the given floating-point type (public static member function of `std::numeric_limits`) [edit]
isnan (C++11) | checks if the given number is NaN (function) [edit]

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