How data abstraction is done in C++ Programming

A class which contains at least one pure virtual functions is called an abstract class. Since abstract classes is incomplete, another class should derive it and provide definition for the pure virtual function in the abstract class.   Following are the features of abstract classes: Abstract class must contain at least one pure virtual functions. Objects cannot be created for abstract classes. But pointer can be created. Classes inheriting abstract classes must provide definitions for all pure virtual function in the abstract class. Otherwise, the sub class also becomes abstract classes. Abstract classes can have non-virtual functions and data member.

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How data abstraction is done in C++ Programming
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