ISINF(3M) Mathematical Library Functions ISINF(3M)

isinf - test for infinity

c99 [ flag... ] file... -lm [ library... ]
#include <math.h>
int isinf(real-floating x);

The isinf() macro determines whether its argument value is an infinity (positive or negative). First, an argument represented in a format wider than its semantic type is converted to its semantic type. Then determination is based on the type of the argument.

The isinf() macro returns a non-zero value if and only if its argument has an infinite value.

No errors are defined.

See attributes(7) for descriptions of the following attributes:

Interface Stability Standard
MT-Level MT-Safe

math.h(3HEAD), fpclassify(3M), isfinite(3M), isnan(3M), isnormal(3M), signbit(3M), attributes(7), standards(7)

November 17, 2008 SunOS 5.11