What is virtual function, abstract class, differences between virtual function and pure virtual function

Question

Accepted Answer

Virtual functions allow polymorphism, abstract classes cannot be instantiated, pure virtual functions have no implementation.

Virtual functions are functions in a base class that can be overridden in derived classes
Abstract classes are classes that have at least one pure virtual function and cannot be instantiated
Pure virtual functions have no implementation and must be overridden in derived classes
Virtual functions can have an implementation in the base class, pure virtual functions cannot
Virtual functions can be called using a pointer or reference to the base class, pure virtual functions cannot

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