ISFINITE(3) BSD Programmer's Manual ISFINITE(3)NAMEisfinite - test for finite value
LIBRARY
libc
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 convert-
ed 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 fin-
ite. Otherwise 0 is returned.
ERRORS
No errors are defined.
SEE ALSOfpclassify(3), isnormal(3), math(3), signbit(3)STANDARDS
The isfinite() macro conforms to ISO/IEC 9899:1999 ("ISO C99").
MirOS BSD #10-current October 29, 2003 1