C# Volume and Surface Area of a Sphere

using System;

class Program
{
    public static void Main()
    {
        double r, surface_area, volume;
        double PI = 3.14;

        Console.WriteLine("Enter the Radius of the Sphere: ");
        r = Convert.ToDouble(Console.ReadLine());

        surface_area = 4 * PI * r * r;
        volume = (4.0 / 3) * PI * r * r * r;

        Console.WriteLine("Surface Area of Sphere is : {0} ", surface_area);
        Console.WriteLine("Volume of Sphere is : {0}", volume);

        Console.Read();
    }
}

 

Output