21. What is the term for a function that is declared inside a class but defined outside of it in C++?
22. What is the process of wrapping data and functions into a single unit called in C++?
23. What is the purpose of the 'this' pointer in C++?
24. What is the purpose of using constructors in C++?
25. What is a constructor in C++?
26. Which keyword is used to create a copy constructor in C++?
27. What is the purpose of a copy constructor in C++?
28. Which access specifier allows members of a class to be accessed only by member functions of the same class and its derived classes in C++?
29. What happens if a class does not explicitly declare any constructors in C++?
30. What is a destructor in C++?
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