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Command: isinf | Section: 3 | Source: NetBSD | File: isinf.3
ISINF(3) FreeBSD Library Functions Manual ISINF(3)
NAME
isinf - test for infinity
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <math.h>
int
isinf(real-floating x);
DESCRIPTION
The isinf() macro determines whether its argument x is an infinity
(positive or negative). An argument represented in a format wider than
its semantic type is converted to its semantic type first. The
determination is then based on the type of the argument.
RETURN VALUES
The isinf() macro returns a non-zero value if the value of x is an
infinity. Otherwise 0 is returned.
SEE ALSO
fpclassify(3), isfinite(3), isinff(3), isnan(3), isnanf(3), isnormal(3),
math(3), signbit(3)
IEEE Standard for Binary Floating-Point Arithmetic, Std 754-1985, ANSI.
STANDARDS
The isinf() macro conforms to ISO/IEC 9899:1999 ("ISO C99").
CAVEATS
On VAX the isinf() function always returns 0, as the architecture doesn't
have a representation for infinity.
FreeBSD 14.1-RELEASE-p8 September 27, 2017 FreeBSD 14.1-RELEASE-p8