A class with at least one pure virtual function is called
A) a pure virtual class.
B) a virtual base class.
C) an abstract class.
D) All of the above
E) None of the above

Question

Quizplus · Accepted Answer

An abstract class is a class that has at least one pure virtual function. This means that the class can never be instantiated and must be subclassed to be useful. A pure virtual class is not a valid term, and a virtual base class refers to a class that is used as a base class for another class and may have virtual functions, but is not necessarily abstract. Therefore, the correct answer is C, an abstract class.

A Class with at Least One Pure Virtual Function Is