isfinite(3)
- NetBSD Manual Pages
ISFINITE(3) NetBSD Library Functions Manual ISFINITE(3)
NAME
isfinite -- test for finite value
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <math.h>
int
isfinite(real-floating x);
DESCRIPTION
The isfinite() determines whether its argument x has a finite value. An
argument represented in a format wider than its semantic type is con-
verted to its semantic type first. The determination is then based on
the type of the argument.
IEEE 754
It is determined whether the value of x is zero, subnormal, or normal,
and neither infinite nor NaN.
VAX
It is determined whether the value of x is true zero or finite, and nei-
ther dirty zero nor ROP.
RETURN VALUES
The isfinite() macro returns a non-zero value if the value of x is
finite. Otherwise 0 is returned.
ERRORS
No errors are defined.
SEE ALSO
finite(3), fpclassify(3), isnormal(3), math(3), signbit(3)
STANDARDS
The isfinite() macro conforms to ISO/IEC 9899:1999 (``ISO C99'').
NetBSD 9.0 August 6, 2011 NetBSD 9.0
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