In a class,functions declared with the virtual keyword need not be defined.

Name: In a class,functions declared with the virtual keyword need not be defined.
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Functions declared as virtual can be left undefined in a base class, but this makes the class abstract, meaning it cannot be instantiated. However, if a derived class does not override these virtual functions, then they must be defined somewhere in the inheritance hierarchy to allow instantiation of derived classes.

In a Class,functions Declared with the Virtual Keyword Need Not