finite(3) -- Linux man page
NAME
isinf, isnan, finite - test for infinity or not-a-number (NaN)
SYNOPSIS
#include <math.h>
int isinf(double value);
int isnan(double value);
int finite(double value);
DESCRIPTION
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.
NOTE
C99 provides additional macros, such as the type-independent
fpclassify(),
isinf()
and
isnan().
CONFORMING TO
BSD 4.3
SEE ALSO
fpclassify(3)
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