#[derive(Debug)]
struct Vec2 {
    x: f32,
    y: f32
}

impl Vec2 {
    pub fn new(x: f32, y: f32) -> Self {
        Vec2 {
            x,
            y
        }
    }

    pub fn add(self, other: Vec2) -> Self {
        Vec2::new(self.x + other.x, self.y + other.y)
    }

    pub fn sub(self, other: Vec2) -> Self {
        Vec2::new(self.x - other.x, self.y - other.y)
    }
}

fn main() {
    let a = Vec2::new(10.0, 20.0)
        .add(Vec2::new(20.0, 20.0))
        .sub(Vec2::new(10.0, 20.0));

    println!("Hello: {:?}", a);
}