Point.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace PointExercise
{
    class Point
    {
        private double x;
        private double y;

        public Point(double x, double y)
        {
            this.x = x;
            this.y = y;
        }
        public double GetX()
        {
            return this.x;
        }
        public void SetX(double x)
        {
            this.x = x;
        }
        public double GetY()
        {
            return this.y;
        }
        public void SetY(double y)
        {
            this.y = y;
        }

        override public string ToString()
        {
            return "(" + this.x + ", " + this.y + ")";
        }

        public double Distance(Point p)
        {
            double dx = GetX() - p.GetX();
            double dy = y - p.y;

            double dis2 = Math.Pow(dx, 2) + Math.Pow(dy, 2);

            return Math.Sqrt(dis2);
        }

        public Point Middle(Point p)
        {
            double midX = (x + p.x) / 2;
            double midY = (y + p.y) / 2;

            Point mid = new Point(midX, midY);
            return mid;
        }
    }
}