using System;

namespace march22
{
	public class Point
	{
		private double x, y;

		public Point(double x, double y)
		{
			this.x = x;
			this.y = y;
		}

		public double X
		{
			get { return x; }
			set { x = value; }
		}

		public double Y
		{
			get { return y; }
			set { y = value; }
		}

		public override string ToString()
		{
			return String.Format("({0:F5},{1:F5})", x, y);
		}

	}

	/// <summary>
	/// Summary description for LineSegment.
	/// </summary>
	public class LineSegment
	{
		private Point[] pts;
		public LineSegment(Point pa, Point pb)
		{
			pts = new Point[2];
			pts[0] = pa;
			pts[1] = pb;
		}

		public double Length()
		{
			double a = pts[1].X - pts[0].X;
			double b = pts[1].Y - pts[0].Y;
			return Math.Sqrt(a*a + b*b);
		}

		public Point MidPoint()
		{
			double x = (pts[1].X + pts[0].X)/2.0;
			double y = (pts[1].Y + pts[0].Y)/2.0;
			Point pm = new Point(x, y);
			return pm;
		}

		public static void Main()
		{
			Point[] pa = new Point[2];

			pa[0] = new Point(-2.0, 4.0);
			pa[1] = new Point(9.0, 7.0);

			LineSegment l = new LineSegment(pa[0], pa[1]);

			Console.WriteLine("Two points: "+pa[0]+pa[1]);
			Console.WriteLine("Length = "+l.Length());
			Console.WriteLine("Middle point: "+l.MidPoint());
		}
	}
}