Perennial Systems Software Developer Interview Questions and Answers

3 coding questions and some McQ questions

Q1. Asked DSa question of TWO sum
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Q2. Dsa question of three sum
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Q1. Dsa question of merge sort
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Q2. DBMS interview questions
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Q3. Operating system questions
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Logical reasoning and Aptitude

Functions with Pointers and strings concepts

Q1. Mainly on Pointers and Dynamic Memory Allocation of 2-D Array
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Q2. Structure Padding and Packing
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First round is online test of 3 virtual rounds consist of aptitude , and coding

Q1. Matrix multiplication
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Q2. Singly linked list
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A singly linked list is a data structure where each element points to the next element in the list.
• Each node in the list contains data and a reference to the next node

• Traversal starts from the head node and follows the next pointers until the end

• Insertion and deletion can be done efficiently at the beginning or end of the list
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Q1. Experience in domains
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Q2. Previous companies
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Q1. SQL basic questions
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Q2. .net and OOP basics
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Oops topic and aptitude

1 round is coding round in pan paper test atleast 5 coding questions and some multiple questions and 1 DSA questions and 4 coding questions correct and dsa correct than interview

Q1. What are oops concepts in java, explain real time scenario
Ans. 
OOPs concepts in Java include inheritance, polymorphism, encapsulation, and abstraction.
• Inheritance allows a subclass to inherit properties and methods from a superclass.

• Polymorphism allows objects to take on multiple forms and behave differently based on their context.

• Encapsulation hides the implementation details of an object and only exposes necessary information.

• Abstraction allows for the creation of abstract class...read more
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Q2. Uses of interface, inheritance
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Interfaces define contracts for behavior, while inheritance allows for code reuse and polymorphism.
• Interfaces allow for loose coupling and abstraction, enabling multiple implementations of the same behavior.

• Inheritance allows for code reuse and extension of existing classes, reducing code duplication.

• Polymorphism allows objects of different classes to be treated as if they were of the same class, simplifying code and i
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Q3. SQL query for join of tables
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SQL query for joining tables
• Use JOIN keyword to combine two or more tables based on a related column

• Specify the columns to be selected using SELECT keyword

• Use ON keyword to specify the condition for joining the tables

• Different types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN
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Q4. Java concepts used in your project
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Used Java concepts such as inheritance, polymorphism, and exception handling in my project.
• Implemented inheritance to create a base class and derived classes with specific functionalities.

• Utilized polymorphism to allow objects of different classes to be treated as if they were of the same class.

• Implemented exception handling to handle errors and prevent program crashes.

• Used interfaces to define a set of methods that a ...read more
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Q5. Overloading vs overriding, practical uses
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Overloading is having multiple methods with the same name but different parameters. Overriding is having a method in a subclass with the same name and parameters as a method in the superclass.
• Overloading is used to provide different ways to call a method with different parameters

• Overriding is used to provide a specific implementation of a method in a subclass

• Overloading is resolved at compile-time while overriding is r...read more
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