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C++ Interview Questions (2023)

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C++ Interview Questions

C++ Interview Questions (2023)

C++ is a general-purpose programming language that was developed in the early 1980s by Bjarne Stroustrup. It is an extension of the C programming language and supports both procedural and object-oriented programming paradigms. C++ is a compiled language, which means that the code written in C++ is converted into machine code by a compiler before it is executed.

In this blog post, we will discuss C++ programming interview questions with answers based in 2023, (C++ Interview Question 2023), here we have provided you with top 50 questions and answers related to C++ programming language, which are asked in interview. If you go for an interview in any IT sector company, then all these questions are definitely asked. That’s why we have prepared top 50 questions and answers for you on this blog related C++ Programming Language.

C++ Interview Questions

C++ Interview Questions with Answers

Questions 1. What is C++ programming?

Answer: C++ is a general-purpose programming language used to create computer software. It is an extension of the C programming language, and it supports object-oriented programming, procedural programming, and generic programming.

 

Questions 2. What are the basic concepts of object-oriented programming (OOP) in C++?

Answer: The basic concepts of OOP in C++ are encapsulation, inheritance, and polymorphism.

 

Questions 3. What is polymorphism in C++?

Answer: Polymorphism is the ability of an object to take on many forms. In C++, polymorphism is achieved through function overloading and virtual functions.

 

Questions 4. What is function overloading in C++?

Answer: Function overloading is the process of creating multiple functions with the same name but different parameters. The compiler chooses the appropriate function based on the arguments passed to the function.

 

Questions 5. What is the difference between pass by value and pass by reference in C++?

Answer: In pass by value, a copy of the actual parameter is made and passed to the function. In pass by reference, a reference to the actual parameter is passed to the function.

 

Questions 6. What is a class in C++?

Answer: A class is a blueprint for creating objects. It defines a set of attributes and methods that an object of that class can have.

 

Questions 7. What is an object in C++?

Answer: An object is an instance of a class. It has its own set of attributes and methods.

 

Questions 8. What is inheritance in C++?

Answer: Inheritance is the process of creating a new class from an existing class. The new class inherits the attributes and methods of the existing class.

 

Questions 9. What is the difference between public, private, and protected access specifiers in C++?

Answer: Public members can be accessed from anywhere, private members can only be accessed from within the class, and protected members can be accessed from within the class and its subclasses.

 

Questions 10. What is a constructor in C++?

Answer: A constructor is a special member function of a class that is called when an object of that class is created. It initializes the object’s attributes.




Questions 11. What is a destructor in C++?

Answer: A destructor is a special member function of a class that is called when an object of that class is destroyed. It deallocates the object’s resources.

 

Questions 12. What is the difference between a copy constructor and an assignment operator in C++?

Answer: A copy constructor is used to create a new object from an existing object, while an assignment operator is used to assign the value of one object to another object.

 

Questions 13. What is operator overloading in C++?

Answer: Operator overloading is the process of defining new meanings for operators such as +, -, *, /, and =.

 

Questions 14. What is a template in C++?

Answer: A template is a generic class or function that can work with different types of data.

 

Questions 15. What is a virtual function in C++?

Answer: A virtual function is a function that can be overridden by a subclass. It is used to implement polymorphism.

 

Questions 16. What is a friend function in C++?

Answer: A friend function is a function that is not a member of a class but has access to the private members of the class.

 

Questions 17. What is a static member function in C++?

Answer: A static member function is a function that belongs to a class rather than an instance of the class. It can be called without creating an object of the class.

 

Questions 18. What is a namespace in C++?

Answer: A namespace is a way to group related functions and variables together. It is used to avoid naming conflicts.

 

Questions 19. What is the difference between a pointer and a reference in C++?

Answer: A pointer is a variable that stores the memory address of another variable. A reference is an alias for a variable. Once a reference is created, it cannot be changed to refer to another variable.

 

Questions 20. What is const in C++?

Answer: Const is a keyword used to indicate that a variable or function parameter cannot be modified.

C++ Interview Question

C++ Interview Questions (2023)

Questions 21. What is the difference between const and constexpr in C++?

Answer: Const indicates that a value cannot be modified, while constexpr indicates that a value can be computed at compile time.

 

Questions 22. What is a lambda function in C++?

Answer: A lambda function is an anonymous function that can be used to define a function inline.

 

Questions 23. What is a smart pointer in C++?

Answer: A smart pointer is a class that wraps a pointer and provides automatic memory management.

 

Questions 24. What is a dynamic memory allocation in C++?

Answer: Dynamic memory allocation is the process of allocating memory at runtime using new and delete operators.

 

Questions 25. What is a virtual destructor in C++?

Answer: A virtual destructor is a destructor that is declared as virtual in the base class. It ensures that the correct destructor is called when an object of a derived class is destroyed.




Questions 26. What is a pure virtual function in C++?

Answer: A pure virtual function is a virtual function that has no implementation in the base class. It must be implemented in the derived class.

 

Questions 27. What is a template specialization in C++?

Answer: A template specialization is a way to define a specific implementation of a template for a particular type.

 

Questions 28. What is an exception in C++?

Answer: An exception is an error that occurs during the execution of a program. It can be caught and handled by an exception handler.

 

Questions 29. What is the difference between a try block and a catch block in C++?

Answer: A try block is used to enclose the code that might throw an exception, while a catch block is used to handle the exception.

 

Questions 30. What is the Standard Template Library (STL) in C++?

Answer: The Standard Template Library (STL) is a collection of classes and functions that provide reusable data structures and algorithms.

C++ Interview Question

Questions 31. What is the difference between a vector and an array in C++?

Answer: A vector is a dynamically resizable array, while an array has a fixed size.

 

Questions 32. What is an iterator in C++?

Answer: An iterator is an object that can traverse a container, such as a vector or a list.

 

Questions 33. What is a deque in C++?

Answer: A deque (double-ended queue) is a container that allows insertion and deletion at both ends.

 

Questions 34. What is a set in C++?

Answer: A set is a container that stores unique elements in sorted order.

 

Questions 35. What is a map in C++?

Answer: A map is a container that stores key-value pairs in sorted order.

 

C++ Interview Questions (2023)

Questions 36. What is a multiset in C++?

Answer: A multiset is a container that stores multiple elements in sorted order.

 

Questions 37. What is a multimap in C++?

Answer: A multimap is a container that stores multiple key-value pairs in sorted order.

 

Questions 38. What is a function object in C++?

Answer: A function object is an object that behaves like a function. It can be called using the function call operator ().

 

Questions 39. What is a hash table in C++?

Answer: A hash table is a data structure that maps keys to values using a hash function.

 

Questions 40. What is a thread in C++?

Answer: A thread is a sequence of instructions that can be executed concurrently with other threads.

 

Questions 41. What is a mutex in C++?

Answer: A mutex is a synchronization object that can be used to ensure that only one thread can access a shared resource at a time.

 

Questions 42. What is a condition variable in C++?

Answer: A condition variable is a synchronization object that can be used to block a thread until a certain condition is met.

 

Questions 43. What is a future in C++?

Answer: A future is an object that represents the result of an asynchronous operation.

 

Questions 44. What is a promise in C++?

Answer: A promise is an object that can be used to set the value of a future.

 

Questions 45. What is move semantics in C++?

Answer: Move semantics is a feature in C++ that allows efficient transfer of resources from one object to another, avoiding unnecessary copying.




Questions 46. What is perfect forwarding in C++?

Answer: Perfect forwarding is a feature in C++ that allows a function to forward its arguments to another function while preserving the exact types and cv-qualifiers.

 

Questions 47. What is the difference between a class and a struct in C++?

Answer: The only difference between a class and a struct in C++ is that the default access level in a class is private, while the default access level in a struct is public.

 

Questions 48. What is the difference between a reference and a pointer in C++?

Answer: A reference is an alias for a variable, while a pointer is a variable that stores the memory address of another variable.

 

Questions 49. What is the difference between an abstract class and an interface in C++?

Answer: An abstract class can have implementation details and non-pure virtual functions, while an interface in C++ is a class containing only pure virtual functions.

 

Questions 50. What is the difference between overloading and overriding in C++?

Answer: Overloading is the process of defining multiple functions with the same name but different parameters, while overriding is the process of redefining a virtual function in a derived class.

C++ Interview Question

Conclusion

So, you learned here Top 50 C++ Programming Interview Questions with Answers, all these questions are very important, if you are from IT sector. I hope you have understood all questions and answers very well and if you have any doubt, regarding it then you can ask in the comment section.

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1 Comment

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