namespace Vector2D


        {
class Program
 {
    static void Main(string[] args)
    {
        Vector2D myVector2D = new Vector2D();
        Console.Write("Enter x value");
        double x = Convert.ToDouble(Console.ReadLine());

        Console.Write("Enter y value");
        double y = Convert.ToDouble(Console.ReadLine());

        myVector2D.NegateX();

    }
 }
}
namespace Vector2D
{
 internal class Vector2D
{
    private double x;
    private double y; //lowercase
    public double xValue
    { get { return x; } set { x = value; } }
    public double yValue
    { get { return y; } set { y = value; } }//uppercase

    public Vector2D(double xValue, double yValue)
        { }
    public void NegateX()
        { }
    public void NegateY()
        { }
    public void AddVector(double x1, double y1)
        { }
    public void SubtractVector(double x2, double y2)
        { }
    public void ScalarMulitplication(double x2, double y2)
        { }
    public double GetMagnitude()
        { }
    public double GetAngleInDegrees()
        { }
        static void Main(string[] args)
    { }
}
}