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


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


61) What is meant by a visibility mode?

Answer: The public, private or protected specifier that controls the visibility and availability of a member in a class is called a visibility mode.


62) What's the difference between `public:', `private:', and `protected:' visibility modes?

Answer: The differences between the `public:', `private:', and `protected:' visibility modes lie in the ways in which members and functions can be accessed within a class.

In the publicly derived class, the public and protected members of the base class become public and protected members of the derived class.

In the privately derived class, the public and protected members of the base class become private members of the derived class.

In the protectedly derived class, the public and protected members of the base class become protected members of the derived class.


63) When should you use inheritances?

Answer: Inheritance finds wide applications in C++ due to the following reasons.

  • Inheritance has the capability to express the inheritance relationships which makes it ensure the closeness with the real-world models.
  • Another reason is the idea of re-usability. Inheritance helps in addition of additional features to an existing class without modifying it.
  • Inheritance possesses a transitive nature.

64) How do you express `private inheritance'?

Answer: The private derivation means, the derived class can access the public and private members f the base class privately. Here, the inherited members can be accessed only through member functions of the derived class.

Private inheritance is expressed as :
class derived-class-name : visibility-mode base-class name
{
;
}


65) What are the access rules with `private' and `protected' inheritance?

Answer: In private derivation, though the derived class inherits all the public and protected members of the base class become private members of the derived class, the objects of the derived class cannot access them directly. Here, the public and protected members of the base class are directly accessible by the member functions and friends of the derived class as if they were the private members of the derived class.



ALSO READ:

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

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

Frequently Asked C++/OOPS Interview Questions With Answers – 16.

Frequently Asked C++/OOPS Interview Questions With Answers – 17.

Frequently Asked C++/OOPS Interview Questions With Answers – 18.

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



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