INFNANSection: Linux Programmer's Manual (3)
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NAMEinfnan - deal with infinite or not-a-number (NaN) result
#include <math.h> double infnan(int error);
DESCRIPTIONThe 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 VALUEIf error is ERANGE (Infinity), HUGE_VAL is returned.
If error is -ERANGE (-Infinity), -HUGE_VAL is returned.
- The value of error is "not-a-number" (NaN).
- The value of error is positive infinity or negative infinity.
NOTESThis obsolete function was provided in libc4 and libc5, but is not available in glibc2.
COLOPHONThis page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.