using System;
using System.Collections;

public class Vector : IComparable {
  private double x, y;
    
  public Vector(double x, double y) { 
    this.x = x; this.y = y; 
  }
    
  public double Length {
    get {
      return Math.Sqrt(x*x + y*y);
    }
  }
    
  public int CompareTo(object obj) {
    Vector v = obj as Vector;
    if(v == null) throw new ArgumentException();
    return this.Length - v.Length;
  }
    
  public override String ToString() { return "vector ("+x+", "+y+") length="+this.Length; }
}


public class Cap4_Ex2_Test {
  
  public static void Main(string[] argv) {
    Vector[] vArray = {new Vector(1.5,2.3), new Vector(3,6), new Vector(2,2)};
    Array.Sort(vArray);
    dumpArray(vArray);
    Array.Reverse(vArray);
    dumpArray(vArray);
  }
    
  public static void dumpArray(Array a) {
    foreach(object o in a) Console.WriteLine(o);
  }
}