//ศุภิสรา ป้องศรี เขียนโค้ด

using System;

​

public class circle

{

    public double p;

    public int r;

    public  circle()

    {

        p=3.14;

        r=5;

    }

}

public class Program

{

    public static void Main()

    {

        circle c1 = new circle();

        Console.WriteLine("circle radius = {0}",c1.r);

        Console.WriteLine("circle area = {0}",3.14*c1.r*c1.r);

    }

}