use std::ops::{Add, Mul};

#[derive(Debug, Clone, Copy)]
struct Vec2 { x: f64, y: f64 }

impl Add for Vec2 {
    type Output = Vec2;
    fn add(self, other: Vec2) -> Vec2 {
        Vec2 { x: self.x + other.x, y: self.y + other.y }
    }
}

impl Mul<f64> for Vec2 {
    type Output = Vec2;
    fn mul(self, scalar: f64) -> Vec2 {
        Vec2 { x: self.x * scalar, y: self.y * scalar }
    }
}

fn main() {
    let a = Vec2 { x: 1.0, y: 2.0 };
    let b = Vec2 { x: 3.0, y: 4.0 };
    println!("{:?}", a + b);
    println!("{:?}", a * 2.0);
}