Techwalnut Innovations Associate Software Engineer Interview Questions and Answers

Q1. Swap two variables, prime number
Ans. 
To swap two variables, use a temporary variable to store one value before swapping them.
• Create a temporary variable to store one of the values

• Assign the first variable to the temporary variable

• Assign the second variable to the first variable

• Assign the temporary variable to the second variable
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Q2. Based on Linux, SQL and other
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Q3. What are pointers
Ans. 
Pointers are variables that store memory addresses of other variables or functions.
• Pointers are used to access and manipulate memory directly.

• They are commonly used in programming languages like C and C++.

• Example: int *ptr; // declaring a pointer to an integer variable
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Q4. Commands on SQL and Linux
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Q5. Questions related to HR
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Q1. What is the difference between drop and delete in SQL?
Ans. 
Drop removes a table from the database while delete removes specific rows from a table.
• DROP is a DDL (Data Definition Language) command used to remove a table and its data from the database.

• DELETE is a DML (Data Manipulation Language) command used to remove specific rows from a table based on a condition.

• DROP command is irreversible and all the data in the table is lost, while DELETE can be rolled back if used within a...read more
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Q2. What are the different commands in SQL?
Ans. 
SQL commands are used to interact with databases and perform various operations like querying, updating, and deleting data.
• SELECT - retrieves data from a database

• INSERT - adds new data to a database

• UPDATE - modifies existing data in a database

• DELETE - removes data from a database

• CREATE - creates a new database or table

• ALTER - modifies the structure of a database object

• DROP - deletes a database object

• JOIN - combines row...read more
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There were two coding questions

There was oncampus coding round , where 1 question was given.

Q1. Tell me something about yourself?
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Q2. What are your projects?
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Q1. Where do you see yourself after 5 years?
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Q1. Read the sentence
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Q2. Listen and repeat the sentence
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Mercel platform 1 hour

Q1. Explain ur project
Ans. 
Developed a web-based project management tool for tracking tasks and deadlines.
• Used HTML, CSS, and JavaScript for front-end development

• Implemented backend functionality using Node.js and MongoDB

• Incorporated user authentication and authorization features

• Utilized RESTful APIs for communication between front-end and back-end
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Q2. One code according to ur cluster
Ans. 
I would write a code snippet based on the specific cluster or category provided.
• Identify the specific cluster or category provided in the question

• Write a code snippet that aligns with the requirements of the cluster

• Ensure the code is accurate and relevant to the given cluster
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General aptitude, behaviourial and some analytical questions

Q1. Tell me about yourself
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Q2. Questions from projects mentioned in resume
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Q3. Few basic technical questions
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Numerical based questions are there mostly

Good basic level coding questions

Q1. Tell me about urself
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Q2. Tell about ur projects
Ans. 
I have worked on various projects including a web application for online shopping and a mobile app for task management.
• Developed a web application using HTML, CSS, and JavaScript for online shopping

• Created a mobile app using React Native for task management

• Implemented RESTful APIs for communication between front-end and back-end systems
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Q1. Difference between abstract class and interface
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, fields, and methods, while interface cannot have any of these.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Abstract classes are used to provide a common base for multiple classes, while interfaces define a contract that implementin
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Q2. Why static and final key words used
Ans. 
Static and final keywords are used in Java to define class-level variables and constants respectively.
• Static keyword is used to define class-level variables and methods, which are shared among all instances of the class.

• Final keyword is used to define constants that cannot be changed once initialized.

• Static variables are accessed using the class name, while final variables are accessed using object references.

• Example: ...read more
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Q1. Basic questions related to your resume
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Q2. Question related to Java
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Q1. Basic HR round questions
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