Ignitarium Technology Solutions Embedded Software Developer Interview Questions and Answers

Round duration - 30 minutes
Round difficulty - Easy

Q1. How do you search for a node in a linked list?
Ans. 
To search for a node in a linked list, iterate through the list and compare each node's value with the target value.
• Start at the head of the linked list

• Iterate through each node by following the 'next' pointer

• Compare the value of each node with the target value

• Return the node if found, otherwise return null
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Q2. How do you detect a loop in a linked list?
Ans. 
To detect a loop in a linked list, we can use Floyd's Cycle Detection Algorithm.
• Initialize two pointers, slow and fast, at the head of the linked list.

• Move slow pointer by one step and fast pointer by two steps.

• If there is a loop, the two pointers will eventually meet.

• Alternatively, we can use a hash set to store visited nodes and check for duplicates.
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Q3. Implement a stack using a singly linked list.
Ans. 
Implement a stack using a singly linked list
• Create a Node class with data and next pointer

• Create a Stack class with top pointer pointing to the top of the stack

• Implement push, pop, and peek operations by manipulating the linked list

• Example: Node class - Node { int data; Node next; }
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Round duration - 40 minutes
Round difficulty - Easy

Q1. What is the top view of a binary tree?
Ans. 
The top view of a binary tree shows the nodes visible from the top when looking down from the root node.
• The top view of a binary tree is the set of nodes visible from the top when looking down from the root node.

• Nodes at the same horizontal distance from the root are considered at the same level in the top view.

• If multiple nodes are at the same horizontal distance, only the topmost node at that level is included in the...read more
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Q2. Explain the process of deleting a node from a linked list, covering all possible cases.
Ans. 
Deleting a node from a linked list involves updating pointers to maintain the list's integrity.
• Identify the node to be deleted by traversing the list

• Update the previous node's next pointer to skip the node to be deleted

• Free the memory allocated to the node to be deleted
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Q1. On python, on storage
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Q1. On python , oops concept ,
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Q1. Why you are changing the job
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1 easy, 1 medium and 1 hard LC

Q1. 1. How will access files in a different server? 2. There are several files all containing similar key value pairs. The values differ in all files. How will you identify all the values that are same and ot...read more
Ans. 
To access files in a different server, use protocols like FTP or SSH. To identify similar key value pairs in multiple files, compare values using a script or tool.
• Use FTP or SSH protocols to access files in a different server

• Write a script or use a tool to compare key value pairs in multiple files

• Identify values that are the same and different across files

• Example: Use Python script to read files and compare key value p
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Q1. What is oops concept example with each one
Ans. 
Object-oriented programming concepts include encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: bundling data and methods that operate on the data into a single unit (class). Example: class Car with properties like make, model, and methods like start(), stop().

• Inheritance: creating new classes based on existing classes, inheriting their attributes and methods. Example: class SUV inheriting from cl...read more
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Q2. What is data structures and types with examples of all types
Ans. 
Data structures are ways of organizing and storing data in a computer so that it can be accessed and used efficiently.
• Types of data structures include arrays, linked lists, stacks, queues, trees, graphs, and hash tables.

• Arrays are a collection of elements stored in contiguous memory locations, accessed using an index.

• Linked lists are a series of nodes where each node contains data and a reference to the next node.

• Stack...read more
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Q3. What is class and objects with example and code
Ans. 
A class is a blueprint for creating objects in object-oriented programming. Objects are instances of classes.
• A class defines the properties and behaviors of objects. For example, a 'Car' class may have properties like 'color' and 'model', and behaviors like 'drive' and 'stop'.

• An object is an instance of a class. For example, 'myCar' can be an object of the 'Car' class with specific values for 'color' and 'model'.

• Code e...read more
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Q4. What is virutal function and staic functions
Ans. 
Virtual functions are functions in a base class that are overridden in derived classes, while static functions belong to the class itself rather than instances.
• Virtual functions allow for dynamic binding and polymorphism in object-oriented programming.

• Static functions are associated with the class itself and can be called without creating an instance of the class.

• Example: virtual void display() = 0; // pure virtual fun...read more
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Q5. What is project u did in present company
Ans. 
Developed a web-based project management tool for tracking tasks and deadlines.
• Used AngularJS for front-end development

• Implemented RESTful APIs for communication between front-end and back-end

• Utilized MySQL database for storing project data
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Write a function over loading and friend class with example?

Virtual round for fundamental coding.

Physical round for coding assignment given on a paper.

Q1. How does twisted cable work? How to see CAN voltage levels on Oscilloscope?
Ans. 
Twisted cables reduce electromagnetic interference and CAN voltage levels can be observed using an oscilloscope.
• Twisted cables consist of pairs of wires twisted together to cancel out electromagnetic interference.

• The twisting helps maintain a consistent impedance, reducing signal degradation over distance.

• To see CAN voltage levels, connect the oscilloscope probes to the CAN High and CAN Low lines.

• Set the oscilloscope t...read more
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Q2. Swap the bits in a byte.
Ans. 
Swapping bits in a byte involves exchanging the positions of bits within an 8-bit binary number.
• A byte consists of 8 bits, indexed from 0 to 7.

• To swap bits, you can exchange pairs: (0, 7), (1, 6), (2, 5), (3, 4).

• Example: For byte 10110010, swapping gives 01011001.

• Use bitwise operations: AND, OR, and XOR to manipulate bits efficiently.

• In programming, you can use masks to isolate and swap bits.
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Q3. Why you want to join the company?
Ans. 
I am excited to join the company for its innovative projects, collaborative culture, and opportunities for professional growth.
• The company's commitment to cutting-edge technology aligns with my passion for innovation, as seen in my previous work on AI-driven applications.

• I admire the collaborative culture here, which fosters teamwork and knowledge sharing, similar to my experience in agile development teams.

• The opportu...read more
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Q4. How soon you can join the company?
Ans. 
I can join the company in two weeks, allowing time for a smooth transition from my current role.
• I need to provide my current employer with a two-week notice period.

• This timeframe ensures I can wrap up ongoing projects and hand over responsibilities.

• If needed, I can negotiate a quicker start date if my current employer agrees.
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Q1. Some technical question on advanced java
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Q1. Scenario based question design swiggy app on microservice architecture
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