Abstract classes are a way of organizing a program. You can get the same thing done without using this way to organize. This is a matter of program design, which is not easy at all.
Here is a sample run of the program:
Dear Santa, Season's Greetings!
The advantage of using an abstract class is that you can group several related classes together as siblings. Grouping classes together is important in keeping a program organized and understandable. The picture shows this program after its object has been constructed.
It would be nice to deal some other cards.
Here is a skeleton for the
Fill in the missing parts.