Originální popis anglicky:
fegetround, fesetround - get and set current rounding direction
Návod, kniha: POSIX Programmer's Manual
#include <fenv.h>
int fegetround(void);
int fesetround(int
round);
The
fegetround() function shall get the current rounding direction.
The
fesetround() function shall establish the rounding direction
represented by its argument
round. If the argument is not equal to the
value of a rounding direction macro, the rounding direction is not changed.
The
fegetround() function shall return the value of the rounding
direction macro representing the current rounding direction or a negative
value if there is no such rounding direction macro or the current rounding
direction is not determinable.
The
fesetround() function shall return a zero value if and only if the
requested rounding direction was established.
No errors are defined.
The following sections are informative.
The following example saves, sets, and restores the rounding direction,
reporting an error and aborting if setting the rounding direction fails:
#include <fenv.h>
#include <assert.h>
void f(int round_dir)
{
#pragma STDC FENV_ACCESS ON
int save_round;
int setround_ok;
save_round = fegetround();
setround_ok = fesetround(round_dir);
assert(setround_ok == 0);
/* ... */
fesetround(save_round);
/* ... */
}
None.
None.
None.
The Base Definitions volume of IEEE Std 1003.1-2001,
<fenv.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
