C++ Inheritance MCQ

Inheritance is one of the foundational pillars of Object-Oriented Programming (OOP). In C++, it allows a class (called the derived or child class) to inherit properties and behaviors from another class (known as the base or parent class). This mechanism promotes the reusability of code, enabling developers to create a new class based on an existing one, inheriting its attributes and behaviors. 

 To help beginners test their understanding of C++ inheritance, here's a quiz tailored just for you. Dive in, and after each question, you'll find the correct answer with a concise explanation. Let's see how much you know!

1. Which keyword is used to inherit a class in C++?

a) extends
b) implements
c) inherits
d) public/private/protected

Answer:

d) public/private/protected

Explanation:

In C++, inheritance is declared using one of the access specifiers: public, private, or protected.

2. Which type of inheritance leads to the diamond problem in C++?

a) Single Inheritance
b) Multilevel Inheritance
c) Multiple Inheritance
d) Hierarchical Inheritance

Answer:

c) Multiple Inheritance

Explanation:

The diamond problem arises due to ambiguity when a class inherits from two classes that have a common base class. This occurs in multiple inheritance.

3. What is the type of inheritance where one class inherits from multiple classes?

a) Single Inheritance
b) Multilevel Inheritance
c) Multiple Inheritance
d) Hierarchical Inheritance

Answer:

c) Multiple Inheritance

Explanation:

Multiple inheritance means a class can inherit properties and behaviors from more than one parent class.

4. By default, the members of the base class are _____ in the derived class.

a) private
b) public
c) protected
d) None of the above

Answer:

a) private

Explanation:

By default, the inherited members of a base class take the private access specifier in the derived class.

5. Which of the following can be inherited from the base class?

a) Public members only
b) Private members only
c) Both public and protected members
d) All members (public, protected, and private)

Answer:

c) Both public and protected members

Explanation:

In C++, derived classes inherit both public and protected members of the base class, but not its private members.

6. What is the type of inheritance where a derived class has only one base class?

a) Single Inheritance
b) Multilevel Inheritance
c) Multiple Inheritance
d) Hierarchical Inheritance

Answer:

a) Single Inheritance

Explanation:

Single inheritance means that a class can inherit from only one base class.

7. In which type of inheritance do multiple derived classes share a single base class?

a) Single Inheritance
b) Multilevel Inheritance
c) Multiple Inheritance
d) Hierarchical Inheritance

Answer:

d) Hierarchical Inheritance

Explanation:

In hierarchical inheritance, multiple derived classes share the same base class.

8. Which of the following cannot be inherited?

a) Constructor
b) Destructor
c) Friends
d) All of the above

Answer:

d) All of the above

Explanation:

In C++, constructors, destructors, and friend functions of the base class are not inherited by the derived class.

9. If the base class's destructor is not virtual, what can happen?

a) Compilation error
b) Runtime error
c) Object slicing
d) Incorrect destructor call for the derived class

Answer:

d) Incorrect destructor call for the derived class

Explanation:

If the base class destructor is not virtual and a derived class object is deleted through a base class pointer, then the derived class's destructor will not be called, leading to potential resource leaks.

10. When a derived class object is destroyed, which destructor is called first?

a) Base class destructor
b) Derived class destructor
c) Both simultaneously
d) It's random

Answer:

b) Derived class destructor

Explanation:

When a derived class object is destroyed, the derived class destructor is called first, followed by the base class destructor.



Related C++ Source Code Examples:

memcpy() function in C++ memmove() function in C++ memchr() function in C++ memcmp() function in C++ memset() function in C++ strcpy() function in C++ strcat() function in C++ strncat() function in C++ strlen() function in C++ strncmp() function in C++ strcmp() function in C++ strcoll() function in C++ strchr() function in C++ strspn() function in C++ strcspn() function in C++ strpbrk() function in C++ strstr() function in C++ strtok() function in C++ strerror() function in C++ fopen() function in C++ fclose() function in C++ freopen() function in C++ setbuf() function in C++ fprintf() function in C++ fscanf() function in C++ scanf() function in C++ printf() function in C++ sprintf() function in C++ sscanf() function in C++ fgetc() function in C++ fputc() function in C++ fgets() function in C++ fputs() function in C++ fread() function in C++ fwrite() function in C++ malloc() function in C++ realloc() function in C++ calloc() function in C++ free() function in C++ rand() function in C++ exit() function in C++ abort() function in C++ system() function in C++ bsearch() function in C++ qsort() function in C++ atoi() function in C++ atol() function in C++ atof() function in C++ strtod() function in C++ strtol() function in C++ abs() function in C++ clock() function in C++ time() function in C++ difftime() function in C++ mktime() function in C++ asctime() function in C++ ctime() function in C++ localtime() function in C++ strftime() function in C++ iscntrl() function in C++ isalnum() function in C++ isalpha() function in C++ isblank() function in C++ iscntrl() function in C++ isdigit() function in C++ islower() function in C++ isupper() function in C++ tolower() function in C++ toupper() function in C++ Stack Implementation in CPP Queue Implementation in CPP Deque Implementation in CPP Priority Queue Implementation in CPP Linked List Implementation in C++ Doubly Linked List Implementation in CPP Circular Linked List Implementation in CPP Binary Tree Implementation in CPP Binary Search Tree Implementation in CPP Hash Table Implementation in CPP AVL Tree Implementation in CPP Bubble Sort Algorithm in CPP Selection Sort Implementation in CPP Insertion Sort Algorithm in CPP Merge Sort Algorithm in CPP Quick Sort Algorithm in CPP Heap Sort Algorithm in CPP Shell Sort Algorithm in CPP Linear Search Algorithm in CPP Binary Search Implementation in CPP C++ Singleton Design Pattern Example C++ Factory Method Pattern Example C++ Abstract Factory Pattern Example C++ Builder Pattern Example C++ Prototype Design Pattern Example C++ Adapter Design Pattern Example C++ Bridge Pattern Example C++ Composite Pattern Example C++ Decorator Pattern Example C++ Facade Pattern Example C++ Flyweight Design Pattern Example C++ Proxy Pattern Example C++ Chain of Responsibility Pattern Example C++ Command Design Pattern Example C++ Interpreter Design Pattern Example C++ Iterator Design Pattern Example C++ Mediator Pattern Example C++ Memento Pattern Example C++ Observer Pattern Example C++ State Pattern Example C++ Strategy Pattern Example C++ Template Method Design Pattern Example C++ Visitor Design Pattern Example

Comments

Post a Comment