isinff man page on Scientific

```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; cc -std=c99
isinff(), isinfl(): _BSD_SOURCE || _SVID_SOURCE
isnan(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE ||
_ISOC99_SOURCE; cc -std=c99
isnanf(), isnanl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600

DESCRIPTION
The finite() functions return a non-zero value if x is neither infinite
nor a "not-a-number" (NaN) value, and 0 otherwise.

The  isnan() functions return a non-zero 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 fpclas‐
sify(3).

fpclassify(3)

COLOPHON
This page is part of release 3.22 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/.

2008-08-05			     FINITE(3)
```
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