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infnan ? deal with infinite or not-a-number (NaN) result |
#include <math.h> double infnan(int error); |
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. |
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. |
ERANGE |
The value of error is positive or negative infinity. |
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EDOM |
The value of error is "not-a-number" (NaN). |
BSD 4.3 |