NCR Corporation Interview Questions and Answers

Q1. What are interfaces and what is difference between an interface and abstract class
Add your answer
Q2. What are solid principles and explain them
Ans. 
SOLID principles are a set of five design principles for writing maintainable and scalable code.
• Single Responsibility Principle (SRP) - a class should have only one reason to change

• Open-Closed Principle (OCP) - a class should be open for extension but closed for modification

• Liskov Substitution Principle (LSP) - subtypes should be substitutable for their base types

• Interface Segregation Principle (ISP) - clients should n...read more
Answered by AI
Add your answer
Q3. What are extension methods
Ans. 
Extension methods are static methods that allow adding new functionality to existing types without modifying the original type.
• Extension methods are defined in a static class.

• They must be declared with the 'this' keyword before the first parameter.

• They can be called as if they were instance methods of the extended type.

• Extension methods can be used to add functionality to built-in types or custom types.

• Example: adding ...read more
Answered by AI
Add your answer
Q4. Does c# support multiple inheritence
Ans. 
No, C# does not support multiple inheritance.
• C# only supports single inheritance, where a class can inherit from only one base class.

• However, C# does support multiple interface inheritance, where a class can implement multiple interfaces.

• This is achieved using the 'interface' keyword instead of 'class'.
Answered by AI
Add your answer
Q5. How routing is done in mvc
Ans. 
Routing in MVC is done through the use of routes, which map URLs to controller actions.
• Routes are defined in the RouteConfig.cs file in the App_Start folder

• Routes consist of a URL pattern and a corresponding controller action

• Routes can also include optional parameters and constraints

• Routing is done through the use of the ASP.NET routing engine

• Routing can be customized by creating custom route handlers
Answered by AI
Add your answer
Q6. What are filters in mvc
Ans. 
Filters in MVC are used to intercept and modify HTTP requests and responses.
• Filters can be used to implement authentication and authorization.

• They can also be used for caching and logging.

• Examples of filters include AuthorizationFilter, ActionFilter, and ExceptionFilter.
Answered by AI
Add your answer
Q7. What is difference between virtual and override keywords
Ans. 
Virtual keyword is used to declare a method in a base class that can be overridden in a derived class. Override keyword is used in the derived class to override the implementation of the virtual method.
• Virtual keyword is used in the base class to declare a method that can be overridden in the derived class

• Override keyword is used in the derived class to override the implementation of the virtual method

• Virtual methods p...read more
Answered by AI
Add your answer
Q8. What are indexes in sql
Ans. 
Indexes in SQL are used to improve the performance of queries by allowing faster data retrieval.
• Indexes are created on one or more columns of a table.

• They work like a book index, allowing the database to quickly find the data.

• Indexes can be clustered or non-clustered.

• Clustered indexes determine the physical order of data in a table.

• Non-clustered indexes create a separate structure to store the index data.

• Indexes should...read more
Answered by AI
Add your answer
Q9. What is difference between stored procedure and function
Ans. 
Stored procedures are used to perform a set of actions, while functions return a single value.
• Stored procedures are precompiled and stored in the database, while functions are compiled at runtime.

• Functions can be used in SQL statements, while stored procedures cannot be used in SQL statements.

• Functions can be called from within stored procedures, but stored procedures cannot be called from within functions.
Answered by AI
Add your answer
Q10. Tell me about yourself
Add your answer
Q11. What is dependency injection
Ans. 
Dependency injection is a design pattern used to remove hard-coded dependencies and make code more modular and testable.
• Dependency injection involves injecting dependencies into a class rather than having the class create them itself.

• This allows for easier testing and swapping out of dependencies.

• There are three types of dependency injection: constructor injection, setter injection, and interface injection.

• Examples of ...read more
Answered by AI
Add your answer
Q12. What is singleton design pattern
Ans. 
Singleton design pattern restricts the instantiation of a class to a single instance and provides a global point of access to it.
• Used when only one instance of a class is required throughout the system

• Provides a global point of access to the instance

• Implemented using a private constructor, static method, and static variable

• Example: Logger class in Java
Answered by AI
Add your answer

Q1. Tell me about yourself
Add your answer
Q2. What are different projects that I have worked
Add your answer
Q3. Did you face any challenges in your earlier projects
Add your answer
Q4. What is your salary expectations
Add your answer
Q5. Explain about dependency injection
Ans. 
Dependency injection is a design pattern that allows objects to receive dependencies from external sources rather than creating them internally.
• Dependency injection helps to decouple components and make them more reusable and testable.

• There are three types of dependency injection: constructor injection, setter injection, and interface injection.

• Example: Instead of creating a database connection object inside a class, w...read more
Answered by AI
Add your answer
Q6. What is a singleton design pattern
Ans. 
Singleton design pattern restricts the instantiation of a class to a single instance and provides a global point of access to it.
• Used when only one instance of a class is required throughout the system

• Provides a global point of access to the instance

• Implemented using a private constructor, static method, and static variable

• Example: Logger class, Database connection class
Answered by AI
Add your answer

Q1. Why should we hire you?
Add your answer
Q2. Share details of your previous job.
Ans. 
In my previous role, I developed scalable web applications and collaborated with cross-functional teams to enhance user experience.
• Developed a customer relationship management (CRM) system using React and Node.js, improving client interaction by 30%.

• Collaborated with UX/UI designers to implement responsive designs, resulting in a 25% increase in user engagement.

• Led a team of 4 engineers in an Agile environment, success...read more
Answered by AI
Add your answer
Q3. What are your salary expectations?
Add your answer
Q4. Why are you looking for a change?
Add your answer
Q5. Tell me about yourself.
Add your answer

Q1. Explain Solid Principles
Ans. 
Solid Principles are a set of five design principles for writing clean, maintainable, and scalable code.
• Single Responsibility Principle (SRP) - A class should have only one reason to change.

• Open/Closed Principle (OCP) - Software entities should be open for extension but closed for modification.

• Liskov Substitution Principle (LSP) - Objects of a superclass should be replaceable with objects of its subclasses without affe...read more
Answered by AI
Add your answer
Q2. What are Design Patterns
Ans. 
Design patterns are reusable solutions to common problems encountered in software design and development.
• Design patterns provide a way to communicate solutions to common design problems

• They help in making code more maintainable, scalable, and reusable

• Examples include Singleton, Factory, Observer, and Strategy patterns
Answered by AI
Add your answer

Q1. Explain the current project architecture you are working on.
Ans. 
Our current project architecture follows a microservices design pattern with Docker containers and Kubernetes for orchestration.
• Microservices architecture

• Docker containers

• Kubernetes for orchestration
Answered by AI
Add your answer
Q2. Why you are intrested in NCR
Ans. 
I am interested in NCR because of its reputation for innovation and cutting-edge technology in the software industry.
• NCR has a strong reputation for innovation and cutting-edge technology

• I am excited about the opportunity to work on challenging projects at NCR

• I believe NCR offers a great platform for career growth and development
Answered by AI
Add your answer

All aptitude coding and mcqs

Q1. Tell me about oops in java
Ans. 
Oops in Java refers to Object-Oriented Programming concepts like inheritance, polymorphism, encapsulation, and abstraction.
• Oops stands for Object-Oriented Programming

• Key concepts include inheritance, polymorphism, encapsulation, and abstraction

• Example: Inheritance allows a class to inherit attributes and methods from another class
Answered by AI
Add your answer
Q2. Some recursion based questions
Add your answer

Write a program to print first and last letters of words alternatively from am list

Q1. Explain oops concept and it's pillars
Ans. 
OOPs stands for Object-Oriented Programming. It is based on four main pillars: Inheritance, Encapsulation, Abstraction, and Polymorphism.
• Inheritance: Allows a class to inherit properties and behavior from another class. Example: class B extends class A.

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: using private access modifiers to restrict access to certain data.

• Abstract...read more
Answered by AI
Add your answer
Q2. Android architecture , thread v/s coroutine
Add your answer