static void Main(string[] args)
{
var myComputer = new Computer();
myComputer.ID = 102;
Item mySecondComputer = new Computer();
mySecondComputer.ID = 103;
Computer mySecondComputer2 = mySecondComputer as Computer;
mySecondComputer2.CPUType = "i7";
string myCPUType = mySecondComputer2.CPUType;
mySecondComputer2.Name = "Jupiter";
mySecondComputer2.Purchase();
Software mySoftware = new Software();
mySoftware.Name = "Foo";
mySoftware.ID = 101;
mySoftware.ISBN = "1234";
mySoftware.Purchase();
}
