using System;
	
class Volume
{	
	public static double GetVolume(int type, double radius, double height)
	{
		if(type==0) //Sphere
		{
			return 4.0*Math.PI*Math.Pow(radius,3.0)/3.0;
		}
		if(type==1) //Cylinder
		{
			return Math.PI*Math.Pow(radius,2.0)*height;
		}
		else if(type==2)//Cone
		{
			return Math.PI*Math.Pow(radius,2.0)*height/3.0;
		}
		else
		{
			Console.WriteLine("Invalid shape type.");
			return -1.0;
		}
	}
	
	public static void Main()
	{		
		int choice;
		double radius, height, volume=0.0;

		do
		{
			Console.WriteLine("Please choose:");
			Console.WriteLine("0.Sphere\n1.Cylinder\n2.Cone\n3.Quit");			
			choice = int.Parse(Console.ReadLine());			
			
			switch (choice)
			{
				case 0: //sphere
				{
					Console.Write("\nInput radius:");
					radius = double.Parse(Console.ReadLine());
					volume = GetVolume(choice, radius, 2*radius);
					if(volume > 0.0)
						Console.WriteLine("\nThe volume is {0}\n",volume );	
					break;
				}		
				case 1: //cylinder
				case 2: //cone
				{
					Console.Write("\nInput radius:");
					radius = double.Parse(Console.ReadLine());
					Console.Write("Input height:");
					height = double.Parse(Console.ReadLine());
					volume = GetVolume(choice, radius, height);
					if(volume > 0.0)
						Console.WriteLine("\nThe volume is {0}\n",volume );			
					break;
				}
				case 3: //to quit
					break;			
				default: //invalid input
				{
					Console.WriteLine("\nInvalid shape type. Please try again.\n");	
					break;			
				}
			}		 
			
		}while(choice!=3);
	}	
}