If foo is an abstract class in a C++ program, why is it acceptable to declare variables of type foo*,but not of type foo?

I am learning OOD in C++. Is there a good example of a dice game that can help teach me how to understand C++ and object oriented design? Concepts such as Using classes abstract data types including: using constructors and destructors, using pointers, using inheritance, providing for exception handling, and using recursive definitions? I myself would like to come up with a game that titled 'high roller' where a player could play a computer where each have 3 dice and the highest score wins. Pretty simple but I am still learning these concepts. Thank you,

IN C++ Demonstrate overriding and overloading functions using the class you built in previous activities. Explain your work by commenting your class.  Submit a screenshot showing the output of a class that has overloading and overriding functions.

For C++ Programming II D.S. Malik Programming Exercise 10-16: Write the definition of a class swimmingPool, to implement the properties of a swimming pool. Your class should have the instance variables to store the length (in feet), width (in feet), depth (in feet), the rate (in gallons per minute) at which the water is filling the pool, and the rate (in gallons per minute) at which the water is draining from the pool. Add appropriate constructors to initialize the instance variables. Also, add member functions to do the following: determine the amount of water needed to fill an empty or partially filled pool, determine the time needed to completely or partially fill or empty the pool, and add or drain water for a specific amount of time, if the water in the pool exceeds the total capacity of the pool, output "Pool overflow" to indicate that the water has breached capacity. The header file for the swimmingPool class has been provided for reference. Write a program to test your…