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# NAN

From cppreference.com
< c‎ | numeric‎ | math

Defined in header `<math.h>` |  |
#define NAN /*implementation defined*/ |  | (since C99)

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

nan nanf nanl (C99)(C99)(C99) | returns a NaN (not-a-number) (function) [edit]
isnan (C99) | checks if the given number is NaN (function) [edit]
C++ documentation for NAN

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