NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | USAGE | ATTRIBUTES | SEE ALSO
cc [ flag ... ] file ... -lm [ library ... ] #include <math.h>int isnan(double x);
The isnan() function returns non-zero if x is NaN. Otherwise, 0 is returned.
On systems not supporting NaN, isnan() always returns 0.
See attributes(5) for descriptions of the following attributes:
ATTRIBUTE TYPE | ATTRIBUTE VALUE |
---|---|
MT-Level | MT-Safe |
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | USAGE | ATTRIBUTES | SEE ALSO