DragonFly On-Line Manual Pages

FEGETROUND(3)         DragonFly Library Functions Manual         FEGETROUND(3)

NAME
     fegetround, fesetround -- control floating-point rounding direction modes

SYNOPSIS
     #include <fenv.h>

     int
     fegetround(void);

     int
     fesetround(int round);

DESCRIPTION
     These functions provide control of floating-point rounding direction
     modes.  The round input argument is a value specifying a rounding
     direction mode and containing any of the values listed below.

     FE_TONEAREST   Results are rounded to the closest representable value.
                    If the exact result is exactly half way between two
                    representable values, the value whose last binary digit is
                    even (zero) is chosen.  This is the default mode.

     FE_DOWNWARD    Results are rounded towards negative infinity.

     FE_UPWARD      Results are rounded towards positive infinity.

     FE_TOWARDZERO  Results are rounded towards zero.

     The fegetround() function gets the current rounding direction.

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

RETURN VALUES
     The fegetround() function returns the current rounding direction.  The
     fesetround() function return zero on success, and non-zero if an error
     occurred.

SEE ALSO
     feclearexcept(3), feenableexcept(3), fegetenv(3)

STANDARDS
     The fegetround() and fesetround() functions conform to ISO/IEC 9899:1999
     (``ISO C99'').

HISTORY
     These functions first appeared in OpenBSD 5.0.

DragonFly 4.1                    June 5, 2013                    DragonFly 4.1