isinff man page on Scientific

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

       finite,	finitef, finitel, isinf, isinff, isinfl, isnan, isnanf, isnanl
       - BSD floating-point classification functions

       #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

       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.

       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‐


       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

				  2008-08-05			     FINITE(3)

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