Infotech Associate Software Engineer Interview Questions and Answers

6 medium coding questions

Q1. What do you mean by Object oriented programing?
Ans. 
Object-oriented programming is a programming paradigm based on the concept of objects, which can contain data and code.
• Objects are instances of classes, which define the structure and behavior of the objects.

• Encapsulation, inheritance, and polymorphism are key principles of object-oriented programming.

• Example: In a banking application, a 'Customer' class can have attributes like name and account balance, and methods li
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Q2. What is relational database? what are it's advantages?
Ans. 
Relational database is a type of database that stores and organizes data in tables with relationships between them.
• Data is stored in tables with rows and columns

• Tables can have relationships with each other through keys

• SQL is commonly used to query and manipulate data in relational databases

• Examples include MySQL, PostgreSQL, Oracle
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Some questions from aptitute and some from web development

Q1. Html css js sql
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Q2. What is table tag
Ans. 
The table tag is an HTML element used to create a table structure on a web page.
• The table tag is used to define the start and end of a table.

• It is typically used in conjunction with the tr (table row) and td (table data/cell) tags.

• Tables can be used to display tabular data, such as a list of items or a grid of information.

• Table tags can also include attributes like border, cellpadding, cellspacing, etc.

• Example:

  Cell 1

  C
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Q3. Give inner join operation
Ans. 
Inner join is an operation that combines rows from two or more tables based on a related column between them.
• Inner join returns only the matching rows between the tables.

• It is performed using the JOIN keyword in SQL.

• The common column used for joining should have the same data type in both tables.

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column;
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Q1. Coding round for some js
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40 questions-aptitude test followed by a technical test comprising 10 questions.

Q1. Add two linked list minimum cost path print all the nodes in a tree except the leaf nodes.
Ans. 
The question asks for adding two linked lists, finding the minimum cost path, and printing all nodes in a tree except the leaf nodes.
• To add two linked lists, traverse both lists simultaneously and add corresponding nodes.

• To find the minimum cost path, use algorithms like Dijkstra's or A*.

• To print all nodes in a tree except the leaf nodes, perform a depth-first traversal and print non-leaf nodes.
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Q1. Mix of hr + technical questions. Didn't ask much deep in technical questions.
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Online test on cocubes which contains 60 questions in 60 minutes.

Q1. Basic questions and sudo code
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Q1. Basically scenario based Logical Questions
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Q1. It is just formality asking you about are your flexibility and salary discussion
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Round duration - 60 Minutes
Round difficulty - Easy

This round started with a coding questions in which I was expected to first explain my approach and then code the solution. This was followed by some more questions from Operating System and Computer Networks.

Q1. 
Minimum Number of Swaps to Sort an Array
Find the minimum number of swaps required to sort a given array of distinct elements in ascending order.
Input:
T (number of test cases)
For each test case:
N (siz...read more
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Q2. How can you print numbers from 1 to 100 using more than two threads in an optimized approach?
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Q3. What is the difference between a process and a program?
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Q4. What is the difference between a process and a thread?
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Q5. Can you describe the OSI Reference Model?
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Q6. What is the use of a router and how does it differ from a gateway?
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Q7. Can you explain the TCP/IP model?
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Round duration - 60 Minutes
Round difficulty - Medium

This round had 2 coding questions followed by some questions from OOPS and Java.

Q1. 
Spiral Order Traversal of a Binary Tree
Given a binary tree with N nodes, your task is to output the Spiral Order traversal of the binary tree.
Input:
The input consists of a single line containing elem...read more
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Q2. 
Two Sum Problem Statement
Given an array A of size N, sorted in non-decreasing order, return two distinct indices whose values add up to a given 'target'. The array is 0 indexed. If multiple answers exist...read more
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Q3. What do you mean by data encapsulation?
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Q4. Can you explain the Singleton Class in Java?
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Q5. What is the garbage collector in Java?
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Round duration - 30 Minutes
Round difficulty - Easy

This was a typical HR round with some standard Behavioral questions.

Q1. Can you tell me something about yourself?
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Q2. Why should we hire you?
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Q1. What is object oriented programming language in java
Ans. 
Java is an object-oriented programming language that uses classes and objects to organize and structure code.
• Java is based on the concept of classes and objects

• Classes define the properties and behaviors of objects

• Objects are instances of classes that can interact with each other

• Java supports encapsulation, inheritance, and polymorphism

• Examples of object-oriented programming in Java include creating a class for a car w...read more
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