namespace ReadOnlyVectorTask
{
    public class ReadOnlyVector
    {
        public readonly double X;
        public readonly double Y;

        public ReadOnlyVector(double x, double y)
        {
            X = x;
            Y = y;
        }

        public ReadOnlyVector Add(ReadOnlyVector newVector)
        {
            return new ReadOnlyVector(X + newVector.X, Y + newVector.Y);
        }

        public ReadOnlyVector WithX(double x)
        {
            return new ReadOnlyVector(x, Y);
        }

        public ReadOnlyVector WithY(double y)
        {
            return new ReadOnlyVector(X, y);
        }
    }
}