abstract function

What is abstract function in C#?
The abstract keyword is used for classes and methods: Abstract class: is a restricted class that cannot be used to create objects (to access it, it must be inherited from another class).
Abstract method: can only be used in an abstract class, and it does not have a body.
Why do we use abstract functions in Java?
The abstract Method is used for creating blueprints for classes or interfaces.
Here methods are defined but these methods don't provide the implementation.
Abstract Methods can only be implemented using subclasses or classes that implement the interfaces._{23 jui. 2023}
What is an abstract function in C++?
A pure virtual function (or abstract function) in C++ is a virtual function for which we can have an implementation, But we must override that function in the derived class, otherwise, the derived class will also become an abstract class.
A pure virtual function is declared by assigning 0 in the declaration._{11 jui. 2023}
A pure Abstract class has only abstract member functions and no data or concrete member functions.
In general, a pure abstract class is used to define an interface and is intended to be inherited by concrete classes.
It's a way of forcing a contract between the class designer and the users of that class.

An abstract function has no implementation and must be in an abstract class. It can only be declared. This forces the derived class to provide the implementation of it. An abstract member is implicitly virtual.

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