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C++/OOPS Interview Questions With Answers - Part X.


Here, are some sample questions based on "C++/OOPS Programming language". Read it carefully as these questions will help you in cracking any interview.


46) Do ‘friends’ violate encapsulation?

Answer: The friend lessens the value of encapsulation of separate classes in object oriented programming. Hence, too many external functions or friend functions are not advisable for use in object oriented programs.


47) What are some advantages/disadvantages of using friends?

Answer: The major advantage of the friend function is that it allows a great degree of freedom in the interface design option. This function is useful when a class needs to hide certain components from the users and use it elsewhere. Friend function efficiently keeps the data details private and secure from the outside-class area.

The major disadvantage of friend function is that it requires an extra line of code while using dynamic binding.


48) What do you mean by the friend function and friend class?

Answer: A friend function is a non-member function that is granted access to a class’s private and protected members.
A friend class is a class whose member functions can access another class’s private and protected members.


49) Why should I use `new' instead of trustworthy old malloc()?

Answer: It is necessary to use ‘new’ instead of the old ‘malloc’ to ensure efficiency of the program. Unlike malloc, new calls the specific constructor. Further, the value returned by new is type safe and the new operator can be overridden.


50) How do I allocate / unallocate an array of things?

Answer: An array of things is allocated or unallocated using the new and delete operators.



ALSO READ:
Frequently Asked C++/OOPS Interview Questions With Answers – 11.

Frequently Asked C++/OOPS Interview Questions With Answers – 12.

Frequently Asked C++/OOPS Interview Questions With Answers – 13.

Frequently Asked C++/OOPS Interview Questions With Answers – 14.

Frequently Asked C++/OOPS Interview Questions With Answers – 15.

… Back To C++/OOPS Interview QnA Index.

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