`atan2(y, x)`

has that discontinuity at PI (180°) where it switches to -PI..0 (-180°..0°) going clockwise.

if i apply the solution from this

```
// rust
(y.atan2(x).to_degrees() + 360.0) % 360.0
```

doesn’t quite work with radians

```
(y.atan2(x) + PI*2.0) % PI*2.0 // doesn't give the right output most of the times
```

i am probably doing it wrong, cause i am not good at math

so what am i missing?

### >Solution :

The problem is that the modulo operator and multiplication have the same precedence, and are left-associative, so your last expression is equivalent to

```
((y.atan2(x) + PI*2.0) % PI) * 2.0
```

If you put parentheses around the second `PI*2.0`

, it should work:

```
(y.atan2(x) + PI*2.0) % (PI*2.0)
```