Interview Questions

1. Whenever a base class is inherited in private mode the public data member of the base class cannot be accessible by the member function of the derived class

Options:

a. True

b. False

Reveal Answer

2. When Inheritance is protected which of the following is true:

Options:

a. Private members of base class are not accessible to derived class

b. Public members of base class are accessible

c. Protected members of the base class remain protected in derived class

d. Public members of the base class become protected in derived class

e. Private members of the base class are accessible to derived class

Reveal Answer

3. What is the output of the following program? #include <iostream> using namespace std; class A { public: void print() { cout <<" This is class A"; } }; class B : public A { public: void print() { cout <<" This is class B"; } }; class C: public B { }; int main(void) { C c; c.print(); return 0; }

Options:

a. This is class A

b. This is class B

c. Compiler Error: Ambiguous call to print()

d. Runtime Error

Reveal Answer

4. Whenever a base class having protected data member is inherited in private mode, the protected data member of the base class becomes ………………… data member of the derived class.

Options:

a. Public

b. Private

c. Protected

d. Inherited

Reveal Answer

5. Whenever a base class having protected data member is inherited in public mode, the protected data member of the base class becomes ………………… data member of the derived class.

Options:

a. Public

b. Private

c. Protected

d. Inherited

Reveal Answer

6. Inheritance can be simple or complex based on:

Options:

a. Reusability

b. No. of Derived class

c. Encapsulation

d. No. of base classes

Reveal Answer

7. Which of these following is used for multiple inheritance

Options:

a. Dot

b. Comma

c. Dollar

d. Tilde

Reveal Answer

8. Whenever the derived class has more than 1 base class and the derived class for 1 class acts as the base class for other that type of inheritance is known as

Options:

a. Multipath inheritance

b. Hierarchical inheritance

c. Multiple inheritance

d. Multilevel inheritance

Reveal Answer

9. What are the two types of inheritances that used in hybrid inheritance

Options:

a. Multilevel inheritance, multiple inheritance

b. Hierarchical inheritance, multilevel inheritance

c. Multiple inheritance, hybrid inheritance

d. Multipath inheritance, multilevel inheritance

Reveal Answer

10. How the duplication of inherited data members can be avoided?

Options:

a. By using virtual base class

b. Using derived class

c. By making the common base class as the virtual base class

d. None of the above

Reveal Answer

11. How the duplication of inherited data members can be avoided?

Options:

a. By using virtual base class

b. Using derived class

c. By making the common base class as the virtual base class

d. None of the above

Reveal Answer

12. When is it mandatory to declare a constructor for derived class?

Options:

a. Base class having zero argument

b. Base class with more than one argument

c. Base class with one or more arguments

d. Both a and b

Reveal Answer

13. What is the order of execution of the constructor when base and derived class both have default constructor?

Options:

a. Base class constructor followed by derived class constructor

b. Default class constructor followed by base class constructor

c. Both will execute simultaneously

d. Will execute in any way either a or b

Reveal Answer

14. In multilevel inheritance the order of the execution of constructors is ……………………

Options:

a. Order of declaration of base classes

b. Order of inheritance

c. Order of declaration of derived classes

d. All of the above

Reveal Answer

15. Let’s say, integer takes 2 bytes. How many bytes will be allocated to the class D in the following program? #include<iostream.h> class A { int arr[10]; }; class B: public A { }; class C: public A { }; class D: public B, public C {}; int main(void) { cout << sizeof(D); return 0; }

Options:

a. 40

b. 20

c. 80

d. 2

Reveal Answer

16. Whenever a program has a virtual base class, the base class constructor will be executed first as compared to other constructors

Options:

a. True

b. False

Reveal Answer

17. Which class is not used for creating any object?

Options:

a. Virtual base class

b. Abstract base class

c. Base class

d. Derived class

Reveal Answer

18. What things does a derived class will not inherit?

Options:

a. Base class

b. Base class constructor, destructor

c. Base class data members

d. Base class member functions

e. Base class friend’s

f. Base class assignment operator

Reveal Answer

Interview Questions and Answer

1. Whenever a base class is inherited in private mode the public data member of the base class cannot be accessible by the member function of the derived class

2. When Inheritance is protected which of the following is true:

3. What is the output of the following program? #include <iostream> using namespace std; class A { public: void print() { cout <<" This is class A"; } }; class B : public A { public: void print() { cout <<" This is class B"; } }; class C: public B { }; int main(void) { C c; c.print(); return 0; }

4. Whenever a base class having protected data member is inherited in private mode, the protected data member of the base class becomes ………………… data member of the derived class.

5. Whenever a base class having protected data member is inherited in public mode, the protected data member of the base class becomes ………………… data member of the derived class.

6. Inheritance can be simple or complex based on:

7. Which of these following is used for multiple inheritance

8. Whenever the derived class has more than 1 base class and the derived class for 1 class acts as the base class for other that type of inheritance is known as

9. What are the two types of inheritances that used in hybrid inheritance

10. How the duplication of inherited data members can be avoided?

11. How the duplication of inherited data members can be avoided?

12. When is it mandatory to declare a constructor for derived class?

13. What is the order of execution of the constructor when base and derived class both have default constructor?

14. In multilevel inheritance the order of the execution of constructors is ……………………

15. Let’s say, integer takes 2 bytes. How many bytes will be allocated to the class D in the following program? #include<iostream.h> class A { int arr[10]; }; class B: public A { }; class C: public A { }; class D: public B, public C {}; int main(void) { cout << sizeof(D); return 0; }

16. Whenever a program has a virtual base class, the base class constructor will be executed first as compared to other constructors

17. Which class is not used for creating any object?

18. What things does a derived class will not inherit?

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