using System;
class TestClass
{
public class Dimensions
{
public const double PI = Math.PI;
protected double x, y;
public Dimensions()
{
}
public Dimensions(double x, double y)
{
this.x = x;
this.y = y;
}
public virtual double Area()
{
return x * y;
}
}
public class Circle : Dimensions
{
public Circle(double r) : base(r, 0)
{
}
public override double Area()
{
return PI * x * x;
}
}
class Sphere : Dimensions
{
public Sphere(double r) : base(r, 0)
{
}
public override double Area()
{
return 4 * PI * x * x;
}
}
class Cylinder : Dimensions
{
public Cylinder(double r, double h) : base(r, h)
{
}
public override double Area()
{
return 2 * PI * x * x + 2 * PI * x * y;
}
}
static void Main()
{
double r = 3.0, h = 5.0;
Dimensions c = new Circle(r);
Dimensions s = new Sphere(r);
Dimensions l = new Cylinder(r, h);
// Display results:
Console.WriteLine("Area of Circle = {0:F2}", c.Area());
Console.WriteLine("Area of Sphere = {0:F2}", s.Area());
Console.WriteLine("Area of Cylinder = {0:F2}", l.Area());
}
}
