C99
Single UNIX Specification, Version 3 C++ TR1 C99
both
z/OS V1R7
Format
#define _ISOC99_SOURCE
#include <fenv.h>
int fesetround(int round);
General description
fesetround() establishes
the rounding mode represented by round.
If the argument is not equal to the value of a rounding mode macro,
the rounding mode is not changed.
Note: The following table shows
the viable formats for these functions. See IEEE binary floating-point for more information about IEEE
Binary Floating-Point.
Function
Hex
IEEE
fesetround
X
Note: This function will not return or update
decimal floating-point rounding mode bits. The fe_dec_getround() and fe_dec_setround() functions
can be used to get and set the current rounding mode for decimal floating-point
operations.
Returned value
If successful, fesetround()
returns 0 when round is set to a rounding
mode.