/// <summary>
/// The entry point of the program.
/// </summary>
private static void Main()
{
Circle circle = new Circle(5);
Console.WriteLine(
"I am a circle. My perimeter is {0:f2}. My area is {1:f2}.",
circle.CalcPerimeter(),
circle.CalcArea());
Rectangle rectangle = new Rectangle(2, 3);
Console.WriteLine(
"I am a rectangle. My perimeter is {0:f2}. My surface is {1:f2}.",
rectangle.CalcPerimeter(),
rectangle.CalcArea());
}