Man Pages

fegetround(3p) - phpMan fegetround(3p) - phpMan

Command: man perldoc info search(apropos)  


FEGETROUND(3P)             POSIX Programmer's Manual            FEGETROUND(3P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

NAME
       fegetround, fesetround - get and set current rounding direction

SYNOPSIS
       #include <fenv.h>

       int fegetround(void);
       int fesetround(int round);


DESCRIPTION
       The fegetround() function shall get the current rounding direction.

       The  fesetround()  function  shall  establish  the rounding direction represented by its argument round. If the
       argument is not equal to the value of a rounding direction macro, the rounding direction is not changed.

RETURN VALUE
       The fegetround() function shall return the value of the  rounding  direction  macro  representing  the  current
       rounding  direction  or  a  negative value if there is no such rounding direction macro or the current rounding
       direction is not determinable.

       The fesetround() function shall return a zero value if and only if the requested rounding direction was  estab-
       lished.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       The following example saves, sets, and restores the rounding direction, reporting an error and aborting if set-
       ting the rounding direction fails:


              #include <fenv.h>
              #include <assert.h>
              void f(int round_dir)
              {
                  #pragma STDC FENV_ACCESS ON
                  int save_round;
                  int setround_ok;
                  save_round = fegetround();
                  setround_ok = fesetround(round_dir);
                  assert(setround_ok == 0);
                  /* ... */
                  fesetround(save_round);
                  /* ... */
              }

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       The Base Definitions volume of IEEE Std 1003.1-2001, <fenv.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers,  Inc  and  The
       Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Stan-
       dard, the original IEEE and The Open Group Standard is the referee  document.  The  original  Standard  can  be
       obtained online at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group                  2003                       FEGETROUND(3P)