HP-UX Reference (11i v1 05/09) - 3 Library Functions A-M (vol 6)

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fesetround(3M) fesetround(3M)

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 zero value if and only if the argument is equal to 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);

/*...*/

}