finite man page on Archlinux

```FINITE(3)		   Linux Programmer's Manual		     FINITE(3)

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(), finitef(), and finitel() functions return a nonzero value
if x is neither infinite nor a "not-a-number" (NaN) value, and 0 other‐
wise.

The isnan(), isnanf(), and isnanl() functions return a nonzero value if
x is a NaN value, and 0 otherwise.

The isinf(), isinff(), and isinfl() functions return 1 if x is positive
infinity, -1 if x is negative infinity, and 0 otherwise.

ATTRIBUTES
The   finite(),	finitef(),  finitel(),	isinf(),  isinff(),  isinfl(),
isnan(), isnanf(), and isnanl() functions are thread-safe.

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 fpclas‐
sify(3).

fpclassify(3)

COLOPHON
This  page  is  part of release 3.65 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/.

2013-07-22			     FINITE(3)
```
[top]

List of man pages available for Archlinux

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

Polarhome, production since 1999.
Member of Polarhome portal.