C++ interview questions and Answers

Last updated on Feb 10, 2022
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C++ interview questions

Developed as “advanced” version of C, C++ works on similar concepts of C language while making significant performance gains in hardware. C++ is one of the top words STILL used on the world’s high web applications like facebook.com, google.com, youtube.com. C++ is also used to make games, and it is a hugely popular language in legacy system applications. We are also highlighting some of the C++ Interview Question and Answers for freshers and experienced as well.

Advantages of C++

  • C++ is faster compared to high-level languages.
  • C++ can be executed on many devices and is easily portable.
  • C++ is perfect in individual bit changes, so it is ideal for hardware device drivers.
  • C++ has an excellent function Library
  • C++ is a fast and quick language.
  • C++ allows the function overloading.

Most Frequently Asked C++ interview questions

Here in this article, we will be listing frequently asked C++ interview questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

Q11. Please explain the reference variable in C++?

Reference variable in C++ is used to give the alternative name to the already defined variable. There is one condition that the reference variable must be initialized at the time of declaration. The reference variables are declared by putting ‘&’ in the constitution

Q12. What are member functions used in C++?

A member function of a class in C++ is a function that has its definition or its prototype within the class like any other variable. Member function operates on an object of the quality of which it is a member, and it has access to all the members of a class for that object.

A member function can be defined inside the class and outside the class.

Q13. What do you mean by public protected and private in C++?
Q14. What do you mean by “this” pointer?

In C++ every object can access its address through this pointer, in other words, it holds the address of the current object or points to the current object.

Q15. Explain the difference between class and struct in C++?
S.no Class Structure
1. Members of Class are Private Members of Class are Public
2. Declared as Class Declared as Struct
3. Used for a more significant amount of Data Used for a smaller amount of Data
4. Supports Inheritance Does not support Inheritance
5. The object is created on the Heap memory The objective is formed on the Stack Memory
Q16. What do you mean by volatile and mutable keywords used in C++?
Q17. What is a storage class used in C++?
Q18. What do you mean by inline function in C++?
Q19. What do you mean by overhead in C++?
Q20. Explain the difference between realloc() and free() in C++?
Development History of C++

C++, a general-purpose object-oriented language was developed by Bjarne Stroustrup of Bell Labs in the year 1979. When C++ was developed its name was C with classes, and it was built as an extension to the C language, but later it was named C++ in 1983 which means the increment of C by 1.C++ has the features like Classes, Abstraction, and Inheritance.C++ is considered to be a little complex language

Here are some of the essential C++ interview questions and answers that will support you in learning the C++ language basics.

Since it is a complex language, it is essential to know the basics accurately to start doing the programs, and therefore we have given you some essential C++ technical interview questions and answers so that you can learn the basics very well.

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