static void Main(string[] args)
        {
			MyClass mc = new MyClass();
			double volume, volume1;
			volume = mc.GetCylinderVolume(3.0, 4.0);
			volume1 = mc.GetCylinderVolume(radius:3.0, height:4.0);

			Console.WriteLine(volume);
			Console.WriteLine(volume1);
		}
        static void Main(string[] args)
        {
			MyClass mc = new MyClass();
			double volume;

			volume = mc.GetCylinderVolume(3.0, 4.0);	// Positional.
			Console.WriteLine("Volume = " + volume);
			volume = mc.GetCylinderVolume(radius: 2.0);	// Use default height.
			Console.WriteLine("Volume = " + volume);
			volume = mc.GetCylinderVolume(height: 2.0);	// Use default radius.
			Console.WriteLine("Volume = " + volume);
			volume = mc.GetCylinderVolume();			// Use both default.
			Console.WriteLine("Volume = " + volume);
		}