Dcm Architects Software Developer Interview Questions and Answers

30min Pseudo Code,Ratio and Proportion

1 hour Array,HashMap

Q1. Write a program a string is Anagram or not
Ans. 
Program to check if a string is an Anagram or not
• Create a function that takes in two strings as input

• Sort the characters in both strings and compare if they are equal

• Return true if they are anagrams, false otherwise
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Q2. How to connect mongodb with database
Ans. 
To connect MongoDB with a database, you need to use the MongoDB URI and a MongoDB client library.
• Use the MongoDB URI to specify the connection details such as host, port, username, password, and database name

• Install a MongoDB client library like Mongoose for Node.js or pymongo for Python

• Use the client library to establish a connection to the MongoDB database and perform CRUD operations
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Q3. What is event listener
Ans. 
An event listener is a function that waits for a specific event to occur and then triggers a response.
• Event listeners are commonly used in web development to handle user interactions like clicks, keypresses, etc.

• They are attached to specific elements and listen for events to occur on those elements.

• Once the event occurs, the listener executes a callback function to respond to the event.

• Example: Adding a click event lis...read more
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Q4. What is polymorphism
Ans. 
Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Inheritance in object-oriented programming languages like Java allows for polymorphism.
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Q1. How to reverse a string without using extra space
Ans. 
Use two pointers to swap characters in place
• Initialize two pointers, one at the beginning of the string and one at the end

• Swap characters at the two pointers and move them towards each other until they meet or cross

• Repeat the process until the entire string is reversed
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Q2. Find a number that not present in array in O(N) time complexity array contain only 0 to n numbers
Ans. 
Use bitwise XOR operation to find the missing number in O(N) time complexity.
• Iterate through the array and XOR all the elements with their indices and the array length.

• The missing number will be the result of XORing all the elements with their indices and the array length.
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Q3. Why should you join this company
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Q4. How many interview have you give previously and why you get rejected
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Q1. Difference between string and string builder.
Ans. 
String is immutable, while StringBuilder is mutable and more efficient for concatenating strings.
• String is immutable, meaning once created, its value cannot be changed. StringBuilder is mutable, allowing for modifications without creating new objects.

• String concatenation creates a new string object each time, while StringBuilder modifies the existing object directly.

• StringBuilder is more efficient for concatenating mul...read more
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Q2. What is async and await
Ans. 
Async and await are keywords in JavaScript used to work with asynchronous code.
• Async is used to define a function as asynchronous, allowing it to run in the background without blocking the main thread.

• Await is used to pause the execution of an async function until a Promise is settled, and then resumes the function with the resolved value.

• Async/await is a more readable and cleaner way to write asynchronous code compare...read more
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Q1. What is HashMap?
Ans. 
HashMap is a data structure that stores key-value pairs and provides constant time complexity for basic operations.
• HashMap allows quick access to values based on their keys

• Keys must be unique and values can be duplicated

• HashMap is not thread-safe and requires synchronization for concurrent access

• Java's HashMap implementation uses hashing to distribute keys across buckets
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Q2. It’s a collection framework.
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Practice atleast 20 questions for every topic.

Q1. Introduction Achievement background education
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Q2. Ask about technical skills and ask questions about projects
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Q1. Sql Query Sequence and basically asks the SqlServer Releted question and Webform Also.
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The first round was an aptitude test. There were 30 questions with 1 marks for each.

After being selected from the first round the second round was the Coding test there were 6 sets and 1 set had 3 questions. they told me to do it in an online compiler without an internet connection.

Q1. After being selected from the coding test. They took technical interviews and asked very basic questions like oops and all but they were doing cross-questioning.
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