To land lucrative offers at top companies, you must master Object-oriented programming interview questions in C# and C++. Being skilled in C# and C++ is essential if the company you're applying to primarily uses these programming languages. Object-oriented programming interview questions on C# and C++ are crucial during technical interviews due to their importance in the tech field.
C# is a statically-typed, object-oriented, generic, and component-oriented programming language. If you are inclined towards web or game development, you can build dynamic websites and applications using C#. In this article, we will provide you with a comprehensive list of questions to practice that will help you assess your C# tech interview prep.
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You must go through the following C# object-oriented programming interview questions to brush up on the basic OOP concepts in context with C#.
The key differences between an interface and an abstract class are:
This is one of the most common object-oriented programming interview questions C#. If you have conflicting method names, you will not be able to independently implement their body in the same class due to the same name and signature. To avoid confusion, you will have to use the interface name before the method name.
Polymorphism refers to having many forms. In OOP, polymorphism is the ability of different types of objects to provide a unique interface for different implementations of methods. The two types of polymorphism in C# are:
Method overloading or compile-time polymorphism is when two or more methods have the same name but different parameters. You can create a method with the same name but with a different signature at compile time. The different ways of overloading methods are by changing:
Access modifiers are keywords that specify the declared accessibility of a type or a member. There are five types of access modifiers:
A method that can be redefined in a derived class is called a virtual method. In C#, it can be implemented on the base and derived classes. It is used when more functionality is needed in the derived class. You can create a virtual method in the base class using the virtual keyword. This method is overridden in the derived class with the help of the override keyword.
Encapsulation is one of the key features of C# and is often a part of object-oriented programming interview questions C#. It is the process of enclosing one or more items in a physical or logical package. In OOP methodology, encapsulation prevents access to implementation details.
You can define a class in terms of another class via inheritance, making it easier to create and maintain an application. Inheritance allows reuse of the code functionality and speeds up implementation time.
For instance, if you create a class, you need not write the new data members and member functions completely. You can simply designate that the new class should inherit an existing class's members and member functions. The existing class is the base class, and the new class is the derived class.
C# supports the following types of inheritances:
Interfaces are used in C# for the following reasons:
An implicit interface implementation is the most regular way to implement members of an interface. You implement implicitly and do not specify the interface name of the members.
Explicit interface implementation requires you to specify the interface name of the members. Explicitly implemented members can be accessed through an Interface instance and not by using a class instance.
You should be prepared to elucidate each of the following three types of design patterns while answering object-oriented programming interview questions C#:
Following are the key differences between encapsulation and abstraction:
Don’t forget to check the top C# Coding Interview Questions and Answers you need to prepare
If you are applying for senior software developer positions, you should be familiar with advanced OOP concepts and be prepared for scenario-based, object-oriented programming interview questions in C#.
C# and C++ are object-oriented programming languages with similar code. While C# is comparatively newer, C++ has been famous for many decades. Preparing object-oriented programming C++ interview questions can help you stand out from the competitors.
Learn about C++ STL container fundamentals in detail here.
This completes our list of the most anticipated object-oriented programming interview questions on C++ and C#. In addition to these questions, you must practice mock interviews to nail the most challenging technical interviews.
Q1. What are the important concepts for object-oriented programming interview questions in C#?
You should thoroughly prepare OOPs concepts, including classes, objects, data hiding, overloading, encapsulation, abstraction, polymorphism, and inheritance, to nail the most challenging object-oriented programming interview questions in C#.
Q2. Which companies put up object-oriented programming interview questions in C#?
Accenture, Google, Delivery Hero, Wipro, Infosys, HCL, TCs, Microsoft, Stack Overflow, Intuit, and Trustpilot are amongst the top tech companies that use C# in their tech stacks. You should be prepared for object-oriented programming interview questions C# if you are applying for software engineering roles at any of these companies.
Q3. How should I prepare for C# object-oriented programming interview questions?
To nail the technical interview rounds at FAANG+ companies, you should begin by studying the basic and advanced concepts of C#. Once you know the crucial concepts, start practicing the most anticipated C# object-oriented programming interview questions. You must go through coding problems to improve your speed and accuracy. Finally, enroll in mock interviews to get familiar with the actual interview environment and receive feedback from hiring managers who are closely acquainted with the FAANG companies' interview processes.
Q4. How is object-oriented programming different from procedural?
Procedural programming is based on a modular approach wherein larger programs are broken into procedures. A procedure is a set of instructions executed one after another. Contrastingly, OOP is based upon objects, and an object contains various elements (methods and variables).
You can specify the scope of data using access modifiers in OOP, but they are not used in procedural programming. Thus, procedural programming allows access to the entire data anywhere in the program.
Q5. Which language is better for coding interview rounds: C++ or C#?
C++ code is faster than C# code, and thus it is a better option for applications where performance is important. However, if you are a beginner planning to prepare any particular language for coding interview rounds, you should opt for the language mentioned in the job description or the one that is easier to learn. Experts suggest that C# is easier and quicker to learn.
Preparing for technical interviews, especially the challenging ones, steers you on the path to becoming a better software professional with improved coding, problem-solving, and behavioral skills. You become more confident at taking and cracking interviews.
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