static void Main(string[] args)
{
int option;
DroidCollection x = new DroidCollection();
Console.WriteLine("1 would you like to add Drone\n2 print list\n3 calculate total cost");
option = Convert.ToInt32(Console.ReadLine());
while (option == 1)
{
x.addDroid();
Console.WriteLine("would you like to add another drone?\n1 yes \n2 print list\n3 calculate total\n4 exit");
option = Convert.ToInt32(Console.ReadLine());
}
if (option == 2)
{
x.printList();
}
if (option == 3)
{
x.totalCost();
}
}