using System;

public class Program

{

​

//Generic object class

abstract class GeometricObject{

public int side;

//Define abstract methods

public abstract double calculateArea();

public abstract double calculatePerimeter();

}

​

​

class Octagon : GeometricObject , ICloneable,IComparable<Octagon>

{

public Octagon(int side){

this.side = side;

}

public Octagon(){

}

//Overide abstract method to implement the area calculation

public override double calculateArea(){

double area = 0;

area = (2 + 4 / Math.Sqrt(2)) * side * side;

return area;

}

//Overide abstract method to implement the perimeter calculation

public override double calculatePerimeter(){

return 8 * side;

}

​

//Clone method

public object Clone()

{

return new Octagon(side);

}

//CompareTo method to compare two object

public int CompareTo(Octagon other)

{

// Compare two sides and return 1 if its same else 0

if (this.side == other.side)

{

return 1;

}

// Default to salary sort. [High to low]

return 0;

}

}

​

class Test{

public static void Main(){

//Create Object

Octagon octogan = new Octagon();

//set value 8

octogan.side = 8;

Console.WriteLine(" Area of Octogan is {0} ", octogan.calculateArea().ToString("0.##"));

Console.WriteLine(" PErimeter of Octogan is {0} ", octogan.calculatePerimeter());

//Create new object using clone

Octagon octoganloned = octogan.Clone() as Octagon;

Console.WriteLine(" Side is {0} ", octoganloned.side);

//Call compareTo to check if both are same

if(octogan.CompareTo(octoganloned)==1)

{

Console.WriteLine(" Both objects are same");

}else{

Console.WriteLine(" Both objects are not same");

}

​

}

}

​

​