INFNAN (3)
deal with infinite or not-a-number (NaN) result
SYNOPSIS
#include <math.h>
double infnan(int error );
DESCRIPTION
The infnan() function returns a suitable value for infinity and
"not-a-number" (NaN) results. The value of error can be ERANGE
to represent infinity or anything else to represent NaN. errno
is also set.
RETURN VALUE
If error is ERANGE (Infinity), HUGE_VAL is returned.
If error is -ERANGE (-Infinity), -HUGE_VAL is returned.
If error is anything else, NAN is returned.
ERRORS
ERANGE
The value of error is positive or negative infinity.
EDOM
The value of error is "not-a-number" (NaN).
CONFORMING TO
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