Developer's Daily | Unix by Example |
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isinf, isnan, finite ? test for infinity or not-a-number (NaN) |
#include <math.h> int isinf(double value); int isnan(double value); int finite(double value); |
The isinf() function returns ?1 if value represents negative infinity, 1 if value represents positive infinity, and 0 otherwise. The isnan() function returns a non-zero value if value is "not-a-number" (NaN), and 0 otherwise. The finite() function returns a non-zero value if value is neither infinite nor a "not-a-number" (NaN) value, and 0 otherwise. |
BSD 4.3 |