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PCA, or Principal Component Analysis, is a dimensionality reduction technique used to simplify datasets while preserving variance.
PCA transforms data into a new coordinate system, where the greatest variance lies on the first axis.
It helps in reducing the number of features while retaining the essential information, making it easier to visualize data.
For example, in image processing, PCA can reduce the number of p...
A hashmap stores key-value pairs using a hash function for efficient data retrieval.
Uses a hash function to compute an index from the key.
Stores data in an array of buckets, where each bucket can hold multiple entries.
Handles collisions using methods like chaining (linked lists) or open addressing.
Example: Inserting key 'A' with value 1 might hash to index 3, storing (A, 1) at that position.
Retrieving value for ke...
Intents are messaging objects in Android that facilitate communication between components of an application.
Intents can start activities, services, or deliver broadcasts.
Explicit intents specify the target component by name, e.g., starting a specific activity.
Implicit intents declare a general action to perform, allowing the system to find the appropriate component.
Intents can carry data using key-value pairs, e.g...
Python is a high-level, interpreted programming language known for its readability and versatility in various applications.
Easy to learn: Python's syntax is clear and intuitive, making it accessible for beginners. Example: print('Hello, World!')
Versatile: Used in web development, data analysis, artificial intelligence, scientific computing, and more.
Rich libraries: Python has a vast ecosystem of libraries like Num...
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SQL (Structured Query Language) is a standard programming language for managing and manipulating relational databases.
SQL is used to perform tasks such as querying data, updating records, and managing database structures.
Common SQL commands include SELECT (to retrieve data), INSERT (to add new records), UPDATE (to modify existing records), and DELETE (to remove records).
Example of a SELECT statement: SELECT * FROM...
A constructor is a special method in a class that initializes objects when they are created.
Constructors have the same name as the class.
They do not have a return type, not even void.
Example: In Java, 'public ClassName() { }' is a constructor.
Constructors can be overloaded to initialize objects in different ways.
Example: 'public ClassName(int value) { this.value = value; }' initializes with a parameter.
Converting infix to postfix involves using a stack to reorder operators and operands based on precedence and associativity.
1. Initialize an empty stack for operators and an empty list for the output.
2. Read the infix expression from left to right.
3. If the token is an operand, add it to the output list. Example: 'A' -> output: ['A']
4. If the token is an operator, pop from the stack to the output list until the ...
Synthesizing data involves techniques to create synthetic datasets for training machine learning models effectively.
Identify the target variable and features needed for the model.
Use data augmentation techniques, such as rotation or flipping for images.
Employ simulation methods to generate data based on known distributions.
Leverage generative models like GANs (Generative Adversarial Networks) to create realistic s...
This code snippet demonstrates how to reverse a string using various programming techniques.
Using built-in functions: In Python, you can reverse a string with slicing: `reversed_string = original_string[::-1]`.
Using loops: Iterate through the string in reverse order and build a new string: `for char in original_string[::-1]: new_string += char`.
Using recursion: Define a function that calls itself with the substrin...
A linked list is a linear data structure where elements are stored in nodes, each pointing to the next, allowing dynamic memory allocation.
Consists of nodes, each containing data and a reference (or pointer) to the next node.
Types include singly linked lists, doubly linked lists, and circular linked lists.
Singly linked list: Each node points to the next node; e.g., A -> B -> C.
Doubly linked list: Each node p...
I applied via Other
I appeared for an interview in Jul 2025, where I was asked the following questions.
Python is a high-level, interpreted programming language known for its readability and versatility in various applications.
Easy to learn: Python's syntax is clear and intuitive, making it accessible for beginners. Example: print('Hello, World!')
Versatile: Used in web development, data analysis, artificial intelligence, scientific computing, and more.
Rich libraries: Python has a vast ecosystem of libraries like NumPy fo...
I appeared for an interview in Dec 2024.
Numerical aptitude test, logical reasoning test, and technical aptitude test.
Case study GD, topic based GD,Role_play GD
I am a software developer with 5 years of experience in Java, Python, and SQL.
5 years of experience in Java, Python, and SQL
Strong problem-solving skills
Experience working in Agile development environment
Familiarity with version control systems like Git
I found this role through a job posting on LinkedIn.
Saw job posting on LinkedIn
Applied through company website
Referred by a friend who works at the company
My long term career goal is to become a senior software architect and lead a team of developers to create innovative solutions.
Work towards gaining expertise in various programming languages and technologies
Take on leadership roles in projects to develop management and communication skills
Attend industry conferences and workshops to stay updated on latest trends and advancements
Seek opportunities for mentorship and pro...
Your company is a leading software development firm specializing in creating innovative solutions for various industries.
Your company has a strong reputation for delivering high-quality software products.
You have a diverse portfolio of clients from different industries.
Your company values innovation and creativity in software development.
Your team is known for its expertise in cutting-edge technologies like AI and bloc...
My favorite programming language is Python because of its simplicity, readability, and versatility.
Python is known for its clean and readable syntax, making it easy to learn and understand.
Python has a large standard library with built-in modules for various tasks, reducing the need for external libraries.
Python is versatile and can be used for web development, data analysis, artificial intelligence, and more.
Object oriented programming is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.
Objects are instances of classes, which define the structure and behavior of the objects.
Encapsulation is the concept of bundling data and methods that operate on the data within a single unit, such as a class.
Inheritance allows classes to inherit attribu...
I appeared for an interview in Sep 2024.
An aptitude test evaluates an individual's potential to excel in a specific area by assessing their strengths and weaknesses in particular abilities.
An assessment that measures an individual's inherent abilities and potential for success in a specific activity.
A coding test is a programming assessment designed to evaluate a candidate's coding skills. It is a standard component of the technical hiring process for software developers and programmers.
Assessment that evaluates a candidate's coding skills
Group discussion (GD) topics for interviews may cover areas such as business, social issues, and current affairs. GDs serve to evaluate a candidate's communication, leadership, and teamwork abilities.
Discussion assignments are prompts that your teacher may assign to you. By participating in these discussions, you can reflect on your learning, share ideas and opinions, or ask and answer questions. Discussions may require you to respond to individual questions or provide multiple responses to an ongoing conversation.
I appeared for an interview in May 2025, where I was asked the following questions.
20 min for 1 round of interview
Multithreading allows multiple threads to run concurrently, improving performance and responsiveness.
Multithreading is used to execute multiple tasks simultaneously within a single process.
It can improve performance by utilizing multiple CPU cores efficiently.
Common multithreading libraries include Java's Thread class and C#'s Task Parallel Library.
Example: In a web server, multithreading can handle multiple client req...
Reverse the number in the array
I applied via Walk-in and was interviewed in Nov 2024. There were 3 interview rounds.
Reverse string ,array sorting
I appeared for an interview in Jun 2025, where I was asked the following questions.
PCA, or Principal Component Analysis, is a dimensionality reduction technique used to simplify datasets while preserving variance.
PCA transforms data into a new coordinate system, where the greatest variance lies on the first axis.
It helps in reducing the number of features while retaining the essential information, making it easier to visualize data.
For example, in image processing, PCA can reduce the number of pixels...
I appeared for an interview in Jun 2025, where I was asked the following questions.
In five years, I see myself as a lead developer, mentoring others and driving innovative projects that impact the industry.
I aim to lead a team of developers, guiding them through complex projects and fostering a collaborative environment.
I plan to deepen my expertise in emerging technologies, such as AI and machine learning, to contribute to cutting-edge solutions.
I envision myself taking on more responsibilities, pos...
I excel in problem-solving and teamwork, but I sometimes struggle with time management under tight deadlines.
Strength: Strong problem-solving skills - I enjoy tackling complex coding challenges, like optimizing algorithms for better performance.
Strength: Effective teamwork - I thrive in collaborative environments, having successfully led a project with cross-functional teams.
Weakness: Time management - I occasionally u...
Some of the top questions asked at the TCS Software Developer interview -
The duration of TCS Software Developer interview process can vary, but typically it takes about less than 2 weeks to complete.
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