fn main() {
    println!("Hello, world!");
}

fn add(a: i32, b: i32) -> i32 {
    a + b
}

struct Point {
    x: f64,
    y: f64,
}

enum Direction {
    Up,
    Down,
    Left,
    Right,
}

trait Describe {
    fn describe(&self) -> String;
}

impl Describe for Point {
    fn describe(&self) -> String {
        format!("Point at ({}, {})", self.x, self.y)
    }
}

const MAX_POINTS: u32 = 100;