Ques 41. Which recursive sorting technique always makes recursive calls to sort subarrays that are about half size of the original array?
Ques 42. What is abstraction?
Ques 43. What are virtual functions?
Ques 44. What is the difference between an external iterator and an internal iterator? Describe an advantage of an external iterator.
An internal iterator is implemented with member functions of the class that has items to step through. .An external iterator is implemented as a separate class that can be "attach" to the object that has items to step through. .An external iterator has the advantage that many difference iterators can be active simultaneously on the same object.
Ques 45. What is a scope resolution operator?
A scope resolution operator (::), can be used to define the member functions of a class outside the class.