struct Point {

  x: f64,

}

impl Point {

  // Calculate the difference and square root

  fn calc(&self, other: &Point) -> f64 {

    (self.x - other.x).abs().sqrt()

  }

}

fn main() {

  let p = Point { x: 4.0 };

  println!("Calc:{:.2}", p.calc(&Point { x: 2.0 }));

}