NAN
NAN
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.
The style used to print a NaN is implementation defined.
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 macro NAN are implementation-defined.