using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
public struct Vector2D
{
    public double x;
    public double y;
    public double dot;

    public Vector2D(double vx,double vy)
    {
        x = vx;
        y = vy;
    }
    public Vector2D(Vector2D temp)
    {
        x = temp.x;
        y = temp.y;
    }
    public double lenght
    {
        get
        {
            double SQRT = Math.Sqrt((x*x) + (y*y));
            return SQRT;
        }
    }
    public double angle
    {
        get
        {
            double Angle = Math.Atan2(y,x);
            return Angle;
        }
    }
    public void Dot(Vector2D temp)
    {
        dot = ((x*temp.x) + (y * temp.y));
    }
    static Vector2D FromPolar()
    {
        Vector2D temp(lenght,angle);
    }
}

namespace ValueType
{
    class Program
    {
        static void Main(string[] args)
        {

        }
    }
}