TCS iON C Developer Interview Questions and Answers

Online zoom coding test will be there - 4 questions - 2 about output of code & 2 about technical questions.

Q1. Polymorphism and explain about virtual polymorphism
Ans. 
Polymorphism is the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• Virtual polymorphism is achieved through virtual functions in C++.

• Virtual functions allow a function in a base class to be overridden in a derived class.

• Example: Animal class with virtual function 'makeSound' overridden in Dog a
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Q2. Write code for virtual polymorphism and explain
Ans. 
Virtual polymorphism allows objects of different classes to be treated as objects of a common superclass.
• Create a base class with virtual functions

• Create derived classes that override the virtual functions

• Use pointers or references of the base class to call the overridden functions
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Q1. About yourself should explain
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Q2. Reason for job change
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Q3. Salary negotiations and location
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Q1. Brief about your project ?
Ans. 
Developed a web application for managing inventory and sales for a retail store.
• Used Angular framework to create a responsive and user-friendly interface.

• Implemented features for adding, updating, and deleting products in the inventory.

• Integrated with backend APIs to fetch real-time sales data and generate reports.

• Utilized Angular Material for designing consistent UI components.
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Q2. What is angular? what is SPA?
Ans. 
Angular is a popular front-end framework for building web applications. SPA stands for Single Page Application.
• Angular is a front-end framework developed by Google for building dynamic web applications.

• It uses TypeScript for building applications with components, services, and modules.

• SPA is a web application that loads a single HTML page and dynamically updates the content as the user interacts with the app.

• SPA provid...read more
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Q3. What is lazy loading?
Ans. 
Lazy loading is a technique in web development where resources are loaded only when needed, improving performance.
• Lazy loading helps reduce initial load time by loading resources on demand

• It is commonly used in Angular for loading modules, components, or routes asynchronously

• Lazy loading can improve user experience by speeding up page load times
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Q4. What is rxjs? in deep?
Ans. 
RxJS is a library for reactive programming using Observables to handle asynchronous data streams.
• RxJS stands for Reactive Extensions for JavaScript.

• It allows you to work with asynchronous data streams and handle events.

• Operators like map, filter, and mergeMap are used to manipulate and combine streams.

• Subscriptions are used to listen to and react to changes in the data streams.

• Example: Using RxJS to make HTTP requests
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Q5. Angular and javascript basic question?
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Q6. Difference between ?? and ?:
Ans. 
?? is the nullish coalescing operator, while ? is the optional chaining operator in Angular.
• ?? is used to provide a default value when a variable is null or undefined.

• ? is used to safely access nested properties of an object without causing errors.

• Example: const name = person?.name; // safe access to 'name' property of 'person' object
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Hackearth online coding test for 1 hour

Q1. Dsa question and output questions
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Q2. Find k largest element in an array
Ans. 
Use sorting or heap data structure to find k largest elements in an array of strings.
• Sort the array in descending order and return the first k elements.

• Use a max heap data structure to efficiently find the k largest elements.

• Examples: ['apple', 'banana', 'orange', 'kiwi'], k=2 -> ['orange', 'kiwi']
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Q1. Remove duplicates from array
Ans. 
Remove duplicates from array of strings
• Create a Set to store unique strings

• Iterate through the array and add each string to the Set

• Convert the Set back to an array to get the unique strings
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Q2. Output related questions on student class object
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Technology advantage or not

All aptitude topics,logical reasoning

Q1. Oops,2 coding questions
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Q2. Palindrome,even number
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Q1. What do you know
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Q2. Do you have any questions
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Q1. It was mainly java, interviewers are very good and supportive to elaborate more about problem.
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Q2. Scenario based on your earlier work experience
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Q1. What is your approach to building basic logic skills?
Ans. 
My approach to building basic logic skills involves practicing problem-solving exercises, breaking down complex problems into smaller parts, and seeking feedback to improve.
• Practice problem-solving exercises regularly to strengthen logical thinking abilities.

• Break down complex problems into smaller, more manageable parts to better understand the problem and find solutions.

• Seek feedback from peers or mentors to identify...read more
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Q1. Some behavioural questions?
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Q1. REST API for User CRUD
Ans. 
Design a RESTful API for CRUD operations on user resources.
• Use HTTP methods like GET, POST, PUT, DELETE for CRUD operations

• Create endpoints like /users for listing all users, /users/{id} for specific user

• Use status codes like 200 for success, 404 for not found, 400 for bad request

• Implement authentication and authorization mechanisms for security

• Include request and response body formats like JSON or XML
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Q2. Two Sum Leetcode problem
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Q3. Basic questions based on the candidate technical skills
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Q1. Basics to Intermediate level of questions based on the skills mentioned in the resume
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Q2. Projects related discussions
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Q1. I was informed to upload the supporting documents. ( They rejected me after this eventhough all my documents are genuine )
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