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FINITE
Section: Linux Programmer's Manual (3)
Updated: 2008-08-05
Index
Return to Main Contents
NAME
finite, finitef, finitel, isinf, isinff, isinfl, isnan, isnanf, isnanl -
BSD floating-point classification functions
SYNOPSIS
#include <math.h>
int finite(double x);
int finitef(float x);
int finitel(long double x);
int isinf(double x);
int isinff(float x);
int isinfl(long double x);
int isnan(double x);
int isnanf(float x);
int isnanl(long double x);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
finite(),
finitef(),
finitel():
-
_BSD_SOURCE || _SVID_SOURCE
isinf():
-
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE;
or
cc -std=c99
isinff(),
isinfl():
-
_BSD_SOURCE || _SVID_SOURCE
isnan():
-
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE;
or
cc -std=c99
isnanf(),
isnanl():
-
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600
DESCRIPTION
The
finite()
functions return a nonzero value if x is neither infinite
nor a "not-a-number" (NaN) value, and 0 otherwise.
The
isnan()
functions return a nonzero value if x is a NaN value,
and 0 otherwise.
The
isinf()
functions return 1 if x is positive infinity, -1 if x
is negative infinity, and 0 otherwise.
NOTES
Note that these functions are obsolete.
C99 defines macros
isfinite(),
isinf(),
and
isnan()
(for all types) replacing them.
Further note that the C99
isinf()
has weaker guarantees on the return value.
See
fpclassify(3).
SEE ALSO
fpclassify(3)
COLOPHON
This page is part of release 3.27 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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