What is the primary purpose of using pure virtual methods in a base class?

In C++, to safely convert a pointer of type A to a pointer of type B, where A and B are related by inheritance, is it appropriate to use dynamic_cast?

An abstract class has at least one pure virtual (abstract) method.

The following code shows how classes A and B are related with inheritance:

Select all statements that will not compile:

Interfaces can only have abstract methods and abstract classes can have both implemented and abstract methods.

Using this knowledge, what is the value of fibonacci(6)? And how many subcalls does it make? Do not include the initial call to the function (the top of the tree)

Separate your answers with a comma. For example, if the value was 10, and it makes 7 subcalls, write 10,7.

If you are stuck, the answer is on the next page

Using this knowledge, what is the value of factorial(10)? And how many subcalls does it make? Do not include the initial call to the function (the top of the tree)

Separate your answers with a comma. For example, if the value was 10, and it makes 7 subcalls, write 10,7.

In class we learned that an abstract class __________ (Select all that apply)