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 10.99 August 6, 2011 NetBSD 10.99

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