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

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fegetround(3M) fegetround(3M)

NAME

fegetround() - get ﬂoating-point rounding direction mode

SYNOPSIS

#include <fenv.h>

int fegetround(void);

DESCRIPTION

The fegetround() function gets the current rounding direction.

The default rounding direction mode is round to nearest (

FE_TONEAREST ).

The ISO/ANSI C committee has approved the

fegetround() 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

fegetround() function returns the value of the rounding direction macro representing the current

rounding direction. The return value will match one of the macros FE_TONEAREST , FE_UPWARD,

FE_DOWNWARD , and FE_TOWARDZERO

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);

/*...*/

}