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### 3.9 `fesetround`—set current rounding direction

Synopsis

    #include <fenv.h>
    int fesetround(int round);

    Link with -lm.

Description
This method attempts to set the current rounding direction represented by round. round must be the value of one of the rounding-direction macros.

Returns
If the rounding mode was successfully established, this method returns zero. Otherwise, a non-zero value is returned.

Portability
ANSI C requires `fesetround`.

Not all Newlib targets have a working implementation. Refer to the file `sys/fenv.h` to see the status for your target.