fegetround(3p) [suse man page]

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 differ (consult the correspond-
       ing 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 established.

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 setting 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, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications 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 Standard, 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)

Check Out this Related Man Page

fegetround(3M)															    fegetround(3M)

NAME

       fegetround() - get floating-point rounding direction mode

SYNOPSIS

DESCRIPTION

       The function gets the current rounding direction, as specified by the IEEE 754 (IEC 60559) floating-point standard.

       The default rounding direction mode is round to nearest

USAGE

       To use this function, compile either with the default option or with the and options.  Make sure your program includes

       For  HP	Integrity  servers,  specify  on  the  compiler command line or place the call to this function under the effect of an affirmative
       pragma:

       If the pragma is placed outside of any top-level declarations in a file, the pragma will apply to all declarations in the compilation  fol-
       lowing the pragma until another pragma is encountered or until the end of the file is reached.

       If  the	pragma	is  placed  at the beginning of a block (compound statement), the pragma will apply until another pragma is encountered or
       until the end of the block is reached.

       For PA-RISC, you might need to use the compiler option in order to prevent optimizations that can undermine the specified behavior of  this
       function.

       Link in the math library by specifying on the compiler or linker command line.

       For more information, see the at the following site:

RETURN VALUE

       The  function  returns  the value of the rounding direction macro representing the current rounding direction.  The return value will match
       one of the following macros, which are defined in

	      Round to nearest.  If the two nearest representable are equally near,
				 the one with its least significant bit zero is delivered.

	      Round upwards (towards +infinity).

	      Round downwards (towards -infinity).

	      Round toward zero.

ERRORS

       No errors are defined.

EXAMPLES

       Save, set, and restore the rounding direction.

SEE ALSO

       fesetround(3M), fenv(5).

STANDARDS CONFORMANCE

       : ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

																    fegetround(3M)

Linux and UNIX Man Pages

fegetround(3p) [suse man page]

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