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Defining Abstract Classes:
A structure that is partially implemented – partially unimplemented is known as an abstract class. When we use the keyword abstract before a class, then that class becomes an abstract class.
Since abstract classes are partially implemented – partially unimplemented structures, they can have function definitions as well as function definitions with bodies.
Any function definition without a body inside an abstract class would be default public even whether we mention it or not.
When we extend an abstract class to a normal class then we have to provide bodies in the class for all then we have to provide bodies in the class for all the function definitions defined inside the abstract class.
We cannot create objects of abstract classes directly using the new operator. Instead, we can define a reference to an abstract class, and to that reference, we can assign an object of a class that extends the abstract class.
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An abstract class can extend to other classes. It is obvious that when an abstract class does not extend other user-defined classes, then, just like other classes, it extends the object class.
We can define an abstract class without abstract function definitions inside it. Hence, defining abstract function definitions inside an abstract class is not compulsory.
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