WASP3D Associate Software Engineer Interview Questions and Answers

Q1. What is the process of data cleansing?
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Q2. What validation methods are utilized by data analysts?
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Aptitude Question on various standard topics .

Q1. Application of stack in real life.
Ans. 
Stacks are used in real life for managing undo operations in text editors, backtracking in maze solving, and managing function calls in programming.
• Undo operations in text editors - allows users to go back to previous states of a document

• Backtracking in maze solving - helps in keeping track of visited paths and backtracking when necessary

• Managing function calls in programming - helps in keeping track of function calls
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Q2. Difference between i++ and ++i through implementation.
Ans. 
i++ and ++i are both increment operators in C++ but have different behaviors.
• i++ is a post-increment operator which increments the value of i after using it in an expression.

• ++i is a pre-increment operator which increments the value of i before using it in an expression.

• Example: int i = 5; int a = i++; // a = 5, i = 6; int b = ++i; // b = 7, i = 7;
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Q1. About your intro and family background.
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It was quite easy, all the questions were from leetcode

Round duration - 60 minutes
Round difficulty - Medium

This round had questions related to aptitude and coding

Q1. 
Find Duplicates in an Array Problem Statement
You are provided with an array/list ARR of size 'N', containing integers ranging from 0 to N - 1. Some elements in this array might be repeating. Your task is...read more
Ans. 
Identify duplicate elements in an array of integers ranging from 0 to N-1.
• Iterate through the array and keep track of seen elements using a hash set.

• If an element is already in the set, it is a duplicate and can be added to the result.

• Return the list of duplicate elements found in the array.
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Round duration - 60 minutes
Round difficulty - Medium

This round had some questions from OOPS and some from DBMS

Q1. What is compile-time polymorphism, and how does it differ from runtime polymorphism?
Ans. 
Compile-time polymorphism is achieved through function overloading and operator overloading, while runtime polymorphism is achieved through virtual functions and inheritance.
• Compile-time polymorphism is resolved during compile-time based on the number and types of arguments passed to a function.

• Examples of compile-time polymorphism include function overloading, where multiple functions with the same name but different ...read more
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Q2. What are the ACID properties in DBMS?
Ans. 
ACID properties in DBMS ensure data integrity and consistency.
• Atomicity: All transactions are either completed in full or not at all.

• Consistency: Data must be in a valid state before and after a transaction.

• Isolation: Transactions should be isolated from each other until they are completed.

• Durability: Once a transaction is committed, changes are permanent and cannot be lost.

• Example: If a bank transfer fails midway, the...read more
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Q3. What are the various types of inheritance in Object-Oriented Programming?
Ans. 
The various types of inheritance in Object-Oriented Programming include single inheritance, multiple inheritance, multilevel inheritance, hierarchical inheritance, and hybrid inheritance.
• Single inheritance: A class inherits from only one base class.

• Multiple inheritance: A class inherits from more than one base class.

• Multilevel inheritance: A class inherits from a class, which in turn inherits from another class.

• Hierarc...read more
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Round duration - 30 minutes
Round difficulty - Easy

This was my last round and I hoped it to go good just like the other rounds. The interviewer was very straight to the point and professional. The interview lasted for 30 minutes.

Q1. What is something about you that is not included in your resume?
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It was an online assessment. Some coding questions. Some cs fundamental mcqs. SQL query, Rest Api question.

An assignment to create a game using nodejs/ go lang/ java.

Q1. Discussion related to Assignment. Told some changes and told to add some more functionalities.
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Q2. Some APIS were given. It was case study. You had to show the dishes to a customer according to his preferences.
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Q1. Basic concepts of OOPS, web development, some easy-medium level coding questions. Your projects and aspirations.
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Q2. Theoretical concepts of DBMS, OS & Computer Network, basic SQL queries.
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Q1. Why should we hire you?
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Q2. What are your strengths and weaknesses?
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Q3. Tell me about yourself.
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Round duration - 90 minutes
Round difficulty - Medium

It was an MCQ + coding based round consisting of multiple choice questions from topics like Aptitude, Logical reasoning, English, Programming ,etc. and 2 coding problems

Q1. 
Prime Numbers within a Range
Given an integer N, determine and print all the prime numbers between 2 and N, inclusive.
Input:
Integer N
Output:
Prime numbers printed on separate lines
Example:
Input...read more
Ans. 
Generate and print all prime numbers between 2 and N, inclusive.
• Iterate from 2 to N and check if each number is prime

• A prime number is only divisible by 1 and itself

• Print each prime number on a new line
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Q2. 
Print All Permutations of a String
Given an input string STR, generate and print all possible permutations of the string.
Input:
str
Output:
All permutations of the input string, each on a new line.
...read more
Ans. 
Generate and print all possible permutations of a given input string.
• Use recursion to generate all permutations by swapping characters in the string.

• Maintain a visited array to keep track of characters already used in a particular permutation.

• Print each permutation as it is generated.

• Handle duplicate characters by skipping swapping if the character is already in the current position.
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Round duration - 75 minutes
Round difficulty - Medium

There were 2 interviewers. Firstly, they asked me to give my introduction. Then they asked me to explain any one of my projects in detail along with its demonstration. After this, they began with the DSA and computer fundamentals part.

Q1. 
Find All Pairs Adding Up to Target
Given an array of integers ARR of length N and an integer Target, your task is to return all pairs of elements such that they add up to the Target.
Input:
The first line ...read more
Ans. 
Given an array of integers and a target, find all pairs of elements that add up to the target.
• Iterate through the array and for each element, check if the difference between the target and the element exists in a hashmap.

• If it exists, add the pair to the result. If not, add the element to the hashmap.

• Handle cases where the same element is used twice in a pair.

• Return the pairs found or (-1, -1) if no pair is found.
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Q2. 
Queue Using Stacks Implementation
Design a queue data structure following the FIFO (First In First Out) principle using only stack instances.
Explanation:
Your task is to complete predefined functions t...read more
Ans. 
Implement a queue using stacks with enQueue, deQueue, peek, and isEmpty operations.
• Use two stacks to simulate a queue - one for enqueueing and one for dequeueing.

• For enQueue operation, push elements onto the enqueue stack.

• For deQueue operation, if the dequeue stack is empty, transfer elements from enqueue stack to dequeue stack.

• For peek operation, return the top element of the dequeue stack.

• For isEmpty operation, check...read more
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Q3. 
Swap Kth Elements in an Array
Given an array ARR of size N, perform the operation to swap the Kth element from the beginning with the Kth element from the end of the array.
Example:
Input:
N = 5, K = 2
...read more
Ans. 
Swap Kth elements in an array with given constraints.
• Create a temporary variable to store the Kth element from the start

• Swap the Kth element from the start with the Kth element from the end

• Return the modified array
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An online test was taken on Aspiring Minds platform. The test duration was of 1 hour and test consists of questions related to aptitude, english and coding.

Q1. Why java is known as platform independent language?
Ans. 
Java is platform independent because it uses the concept of bytecode and virtual machine.
• Java code is compiled into bytecode, which is a platform-independent representation of the code.

• The bytecode is then executed by the Java Virtual Machine (JVM), which is specific to each platform.

• This allows Java programs to run on any platform that has a compatible JVM.

• The JVM acts as an interpreter, translating the bytecode into ...read more
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Q2. What is exception handling. How to implement it?
Ans. 
Exception handling is a mechanism to handle runtime errors and prevent program crashes.
• Exception handling is used to catch and handle errors that occur during program execution.

• It involves the use of try-catch blocks to catch exceptions and handle them gracefully.

• The try block contains the code that might throw an exception, and the catch block handles the exception.

• Multiple catch blocks can be used to handle different...read more
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Q3. Given a list of custom class objects. Write a program to sort that list based on one of its properties.
Ans. 
Sort a list of custom class objects based on one of its properties.
• Use a sorting algorithm like bubble sort, insertion sort, or merge sort.

• Implement a comparison function to compare the desired property of the objects.

• Apply the sorting algorithm to the list of objects using the comparison function.
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Q4. Write a SQL query to print number of rows in a table.
Ans. 
A SQL query to count the number of rows in a table.
• Use the COUNT() function in SQL to count the number of rows in a table.

• Specify the table name in the FROM clause.

• Use the result of the COUNT() function to print the number of rows.
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Q5. What are fundamental pillars of OOPS programming. Explain each of them in detail.
Ans. 
The fundamental pillars of OOPS programming are encapsulation, inheritance, and polymorphism.
• Encapsulation: It is the process of hiding the internal details of an object and providing a public interface for interacting with it.

• Inheritance: It allows creating new classes by inheriting properties and behaviors from existing classes, promoting code reuse.

• Polymorphism: It enables objects of different classes to be treated ...read more
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Q1. Tell me about yourself
Ans. Tell me about your experience and learnings which you got from your internships.
Answered by Aman Mehta
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Q2. Where do you see yourself after 5 years?
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