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.

Q1. What is c++ & why it is used?

C++ is the object-oriented programming language.C++ is considered as one of the most esteemed languages to work with when it comes to Operating systems, and games.C++ language is a middle-level programming language designed by Bjarne Stroustrup in the year 1979 in Bell Laboratories. It is an object-oriented language that has features like Inheritance, Polymorphism, Encapsulation, and Abstraction.

It is used to teach the graphics libraries in high-level applications and the applications that are used to communicate with devices over the network.

Q2. What is the latest version on C++?

The latest version of C++ is ISO/IEC 14882:2017 which is also known as C++17. This is the fifth edition.

Q3. Explain the difference between C & C++?
S.no C Programming Language C++ Programming Language
1. C is a procedural programming language C++ is a procedural and object-oriented programming language
2. The data and functions are different entities C++ data and functions both are encapsulated together into an object
3. Functions cannot be defined inside the structures Functions can be described inside the structures
4. The information cannot remain hidden so that it can be manipulated by another code Encapsulation hides the data thus protecting the data to get used by another code
Q4. What are the advantages of C++? Explain

The benefits of C++ language are:-

  • Faster compared to high-level languages.
  • can be executed on many devices and is easily portable.
  • very good in individual bit changes, so it is perfect for hardware device drivers.
  • great function Library
  • fast and quick language
  • Allows the function overloading.
Q5. Why is C++ called OOPs? Explain

C++ is called OOPs because it supports Object-oriented Programming which means C++ look into the problem regarding objects rather than the procedure for doing that problem.

Q6. What is oops and list its features in C++?

OOPS stands for Object-Oriented Programming.OOPS refers to the programming in which programming is based on the objects that can contain data and code rather than based on the functions and procedures.

Features of OOP
  • Object
  • Class
  • Data Hiding and Encapsulation
  • Dynamic Binding
  • Message Passing
  • Inheritance
  • Polymorphism
Q7. Please explain Class & Object in C++?

Class:- Class is the collection of the same type of objects and objects are the variables of the type Class and once the Class has been defined any number of objects can be added to that same class. For examples Eagle, Sparrow, Pigeon, Crow are the objects of the Class Bird

Objects:- Object is the collection of the entities, and the objects occupy the space in the memory. An object contains data and code. When any program is executed the objects interact with each other by sending the messages without knowing their data and code.

Q8. What is polymorphism & list its types in C++?

The simple meaning of polymorphism is more than one form. In C++ a program can have more than one function with the same name that can perform different activities

Types of polymorphism in C++

  • ad-hoc polymorphism
  • parametric polymorphism
  • subtype polymorphism
Q9. What is namespace & why it is used in C++?
Q10. What is a Loop? What are different types of loops in C++?

In C++ loop is used to perform specific repetitive tasks until a condition is satisfied.


for ( variable initialization; condition; variable update ) {
   // Code to execute while the condition is true

while ( condition )
    // Code to execute while the situation is true

do {
} while ( condition );

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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