C++ Standard Library C++ STL Library
C++ Standard Library C++ STL Library

C++ <cmath> - NAN

The NAN macros expands to an expression of type float that represents a NaN if the implementation supports quiet NaNs (otherwise, it is not defined). If the implementation does not support quiet NaNs, this macro constant is not defined.

Definition in the <cmath> header file is:

#define NAN /* implementation defined */

❮ C++ <cmath> Library
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