struct Point {
    x:f64,
    y:f64
}
struct Line{
    start:Point,
    end:Point,
}

impl Line {
    fn len(&self)->f64 {
        let dx=self.start.x-self.end.x;
        let dy=self.start.y-self.end.y;
        (dx*dx+dy*dy).sqrt()
    }

}


fn main() {
  
    let p=Point{x:3.0,y:4.0};
    let p2=Point{x:5.0,y:10.0};
    let myLine=Line{start:p,end:p2};
    println!("mesafe : {}",myLine.len());
}