Manpage of INFNAN
INFNANSection: Linux Programmer's Manual (3)
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 errorcan be ERANGEto represent infinity or anything else to represent NaN. errnois also set.
RETURN VALUEIf erroris ERANGE(Infinity), HUGE_VALis returned.
If erroris -ERANGE(-Infinity), -HUGE_VALis returned.
- The value of erroris "not-a-number" (NaN).
- The value of erroris positive infinity or negative infinity.
NOTESThis obsolete function was provided in libc4 and libc5, but is not available in glibc2.
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