XenonStack HR Trainee Interview Questions and Answers

1) Query for the second highest salary. 2) Determine the frequency of characters in a string and remove those that do not repeat. 3) For a string, convert characters with an odd number of occurrences to lowercase, and replace those with an even number of occurrences with the preceding character.

Normal DSA and sql is more then enough.

Q1. Project and subject related questions.
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Some problems on coding

Q1. Some questions on core java
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Q2. Methodoverloading
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Q3. Object-oriented question
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Q1. About your self
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20 aptitude question 10 was the cut off

There were total 9 question 3 mcq and 6 DSA question easy to moderate.

Q1. Deep discussion on javascript and project. They asked lot of questions on binary search, interviewer wants to check how strong is my basic concept is. Last question was also on binary search(HARD)
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Q1. Deep discussion about my all projects. Again asked 1 DSA question (Easy)
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Q1. This round was basically to tell me that I was selected.
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Q1. Some sql queries and theoritical questions about sql.
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Q2. Everything in your resume will be asked.
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Q1. What is recursive function?
Ans. 
A recursive function is a function that calls itself within its definition.
• A recursive function must have a base case to prevent infinite recursion.

• Recursion is often used to solve problems that can be broken down into smaller, similar subproblems.

• Example: Factorial function, Fibonacci sequence.
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Q2. Difference between c and c++
Ans. 
C is a procedural programming language while C++ is an object-oriented programming language.
• C is a procedural programming language, while C++ is a combination of procedural and object-oriented programming.

• C does not support classes and objects, while C++ does.

• C does not have built-in support for exception handling, while C++ does.

• C does not have namespaces, while C++ does.

• C does not have function overloading, while C++
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Q3. Inheritance and data structures?
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Q1. What are the Oops concepts
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Oops concepts are the fundamental principles of object-oriented programming, including inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex i...read more
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Q2. How to reverse any string
Ans. 
To reverse a string, iterate through the characters and build a new string in reverse order.
• Iterate through the characters of the string from end to start

• Append each character to a new string to build the reversed string

• Return the reversed string as the result
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Q1. Tell me about yourself
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I am a passionate software developer with experience in Java, Python, and web development.
• Experienced in Java, Python, and web development technologies

• Strong problem-solving skills

• Familiar with Agile methodologies

• Completed multiple projects including a web-based inventory management system
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Q1. We are you applied to this job
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Q1. General discussion
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Q1. Java script and output related Questions
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ReactJs assignment related to search bar and pagination