XenonStack Associate Security Engineer Interview Questions and Answers

Three programming questions
1 pattern
2 string
Array

Q1. Simple core Java
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Q1. About your self
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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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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.

General DS, Algo and Basic CS question.

Q1. General OS, DS and DB question.
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Q2. Gneral programming question.
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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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Normal DSA and sql is more then enough.

Q1. Project and subject related questions.
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Asked JS based Questions and assisment

Q1. Asked basic question on team work and hobbies
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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++
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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
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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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