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Whats an abstract class?

Answer:

A class that cannot be instantiated. A concept in C++ known as pure virtual method. A class that must be inherited and have the methods over-ridden. Essentially, it’s a#4767d0print for a class without any implementation.

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Hows method overriding different from overloading?	When do you absolutely have to declare a class as abstract (as opposed to free-willed educated choice or decision based on UML diagram)?