# 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 direc-
tion 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 repre-
sentable 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 direc-
tion 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 4.3 June 5, 2013 DragonFly 4.3