trusty (3) finitel.3.gz

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 otherwise.

       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

   Multithreading (see pthreads(7))
       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
       fpclassify(3).

SEE ALSO

       fpclassify(3)

COLOPHON

       This page is part of release 3.54 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)