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```{index} single: fesetround; POSIX function
```
```{index} single: POSIX::fesetround; Perl function
```

# fesetround

Change the floating-point rounding direction.

## Synopsis

```perl
use POSIX qw(fesetround FE_DOWNWARD);
fesetround(FE_DOWNWARD);
```

## What you get back

`0` on success, non-zero if the requested mode is not supported.

## Differences from upstream

Fully compatible with upstream POSIX.