Top C++ Interview Questions And Answers to prepare for

Questions to ask at an interview are an essential component of the selection procedure for any firm or organization. One needs to have complete confidence in their answers to the interview questions in order to confront the interviewer. In this lesson on C++ interview questions, you will examine the most often asked C++ interview questions that one ought to be familiar with in order to succeed.

You may anticipate to be asked conceptual questions, multiple-choice questions, output-based questions, and programming questions during any C++ interview; this C++ interview questions and answers lesson will walk you through all of these question types.

1. What exactly is C++?

The computer programming language known as C++ is a superset of the language known as C, but it also includes certain additional features.

2. Does C++ make use of Object-Oriented Programming?

Yes, it does. Object-Oriented Programming is a paradigm that encompasses ideas such as data binding, polymorphism, and inheritance, amongst others. An Object-Oriented Programming System is a type of programming language.

3. What exactly is a Category?

In object-oriented programming, a class is a user-defined data type that serves as the primary building block. It reflects various entities, their properties, and the actions they take.

4. What is an example of an object?

An instance of a class is referred to as an object. Fields, methods, and constructors are all components that can be present in an object.

5. Can you explain what encapsulation is?

The technique of encapsulation involves tying together the data and functions that are contained within a class. It is implemented in order to prohibit direct access to the data for reasons relating to data security. For the purposes of this endeavor, the functions of a class are utilized.

6. What exactly is an abstract?

The act of hiding the internal implementations of a C++ program and exposing only the necessary details is known as an abstraction.

For instance, when you send an important message by email, the only options that are utilized at that moment are writing the content and hitting the submit button. This outcome is nothing more than the success message that is shown to confirm that your email has been delivered successfully. However, the process followed in transferring the data by email is not displayed because it is of no benefit to you.

7. Can you explain what inheritance is?

Classes written in C++ have the ability to inherit portions of the behavior and state that are most frequently used from other classes. Inheritance is the term used to describe this process.

8. Can you explain what an access specifier is and what the different sorts are?

An access specifier is a piece of code that decides how members of a class, such as functions and variables, can be accessed from outside the scope of the class. The following is a list of the three different types of access specifiers in C++:

Members of a class that are marked as private can only be accessed by other members of the same class. They cannot be accessed outside of the class in which they were declared. Even child classes are unable to access the parent class’s private members because of this restriction.

Child classes are able to access the protected members of their parents’ classes, in addition to being able to access the protected members of the class in which they were declared.

Class members who have chosen to make their information accessible to the general public are referred to as public.

9.Can you tell me what the ‘this’ pointer is?

This is a constant pointer that stores the memory address of the object that is currently active in the program. It is denoted by “this.” It is passed along to each and every nonstatic member function call in the form of a secret argument. It can be used as a local variable within the bodies of all nonstatic functions because it is accessible there.

The ‘this’ pointer is not accessible to static member functions because they can be invoked even in the absence of any object, i.e., by using the name of the class.

10.  What are the most significant distinctions between C and C++ programming languages?  Asked during C++ Interview Questions And its Answer.

C doesn’t have support for references, whereas C++ does.
C++ was designed with a number of built-in features, some of which are friend functions, function overloading, inheritance, templates, and virtual functions. The programming language C does not provide support for these features.
In C, exception management is taken care of in the classic if-else approach. On the other hand, C++ provides built-in support for managing exceptions at the level of the programming language.
The scanf() and printf() functions in C are the most common ones used for input and output, respectively. In C++, the standard input stream is denoted by the letter cin, while the standard output stream is denoted by the letter cout.
C is a procedural programming language, although C++ offers support for both object-oriented and procedural programming approaches. C is a procedural programming language.
11. What is the definition of a destructor?

The member function of a class is referred to as its destructor. In addition to having the same name as the class itself, it has the tilde symbol () prefixed to its name. It is possible for it to be executed automatically anytime an object loses the scope it had previously had. A destructor can never have an overload, and its form is the only one that does not require any parameters.

12. What kind of constructor is the default one?

In the event that the provider does not give a constructor for a certain class, the compiler will provide one. It is referred to as a default constructor when the situation occurs when the programmer supplies the constructor with no particular parameters.

13. What key distinctions define a structure as distinct from a class in C++?

When it comes to C++, a class and a structure are not interchangeable due to two key differences. These include:

When a structure is derived from a class or some other structure, the access specifier for the base class or structure is transformed into a public access specifier by default. When a class is derived from another, the default access specifier always has the private access mode.
In contrast, the members of a class are kept private by default, even though the members of a structure are exposed to the public by default. What is meant by the term “static member”?
A static member, as denoted by the static keyword, will only ever have storage space allotted to it in the static storage area during the entirety of the lifetime of the program.

The following are some essential information regarding the static members:

There is no way to virtualize a static member function.
The ‘this’ pointer is not available in static member functions.
In the case of static member functions, the const, const volatile, and volatile declarations are unavailable to use.
14. Can you explain what the Reference variable is?

In C++, the name that is assigned to the variables that are already in use is known as the reference variable. In C++, the memory location that stores the variable name and the memory region that stores the reference variable point are the same. This allows the original variable to be updated by using the reference variable.

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