Table of Contentsisinf, 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 finite or is not a "not-a-number" (NaN) value, and 0 otherwise.
BSD 4.3
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