NAME
fesetround() — set floating-point rounding direction mode
SYNOPSIS
#include <fenv.h>
int fesetround(int round);
DESCRIPTION
The
fesetround()
function establishes the rounding direction represented by
its argument
round.
The
round
argument must equal one of the macros
FE_TONEAREST,
FE_UPWARD,
FE_DOWNWARD,
and
FE_TOWARDZERO.
If the argument does not match a rounding direction macro, the
rounding direction is not changed.
The default rounding direction mode is round to nearest
(FE_TONEAREST).
The ISO/ANSI C committee has approved the
fesetround()
function for inclusion in the C9X draft standard.
To use this function, compile either with the default
-Ae
option or with the
-Aa
and
-D_HPUX_SOURCE
options. Make sure your program includes
<fenv.h>.
Link in the math library by specifying
-lm
on the compiler or linker command line.
For more information, see the
HP-UX Floating-Point Guide.
RETURN VALUE
The
fesetround()
function returns a nonzero value if and only if the argument matches a
rounding direction macro.
ERRORS
No errors are defined.
EXAMPLE
Save, set, and restore the rounding direction.
#include <fenv.h>
/*...*/
{
int save_round;
save_round = fegetround();
fesetround(FE_UPWARD);
/*...*/
fesetround(save_round);
/*...*/
}
