Qmex Steel Construction Software Development Engineer 1 Interview Questions and Answers

Q1. Complete oops concepts with examples?
Ans. 
OOP is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.
• OOP focuses on creating objects that interact with each other to solve problems.

• Key concepts include encapsulation, inheritance, and polymorphism.

• Encapsulation involves bundling data and methods that operate on the data into a single unit.

• Inheritance allows classes to inherit at...read more
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Q2. Virtual function and virtual Destructor?
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Q3. Multithreading with example?
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Multithreading is the ability of a CPU to execute multiple threads concurrently, allowing for improved performance and responsiveness.
• Multithreading allows multiple tasks to be executed simultaneously on a single CPU core.

• Each thread has its own program counter, stack, and set of registers.

• Example: A web browser using multithreading to load a webpage while simultaneously downloading images in the background.
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Q1. Oops, concepts with examples?
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Q2. Matrix rotate by 180 degrees?
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Rotate a 2D matrix by 180 degrees in place without using extra space.
• Iterate through the matrix and swap elements symmetrically across the center row.

• Use two pointers, one starting from the first row and the other from the last row, to swap elements.

• Repeat the swapping process for each row until the entire matrix is rotated.

• Example: Input matrix = [[1,2,3],[4,5,6],[7,8,9]], Output matrix = [[9,8,7],[6,5,4],[3,2,1]]
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Standard process in hackerrank

Q1. Standard interview with live coding
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Q2. Find the second largest element in an array
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Q1. Describe yourself in 3 words
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Aptitude, electronics

Q1. Transformer and power supply
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Q2. What is a pointer
Ans. 
A pointer is a variable that stores the memory address of another variable.
• Pointers are used to access and manipulate memory locations directly.

• They are commonly used in programming languages like C and C++.

• Example: int *ptr; // declares a pointer to an integer variable
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Q1. What all thinks happen on powering on a device.
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When a device is powered on, several processes occur including booting up the operating system, initializing hardware components, loading necessary drivers, and launching user interface.
• Booting up the operating system

• Initializing hardware components

• Loading necessary drivers

• Launching user interface
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Q1. What is the usage of Yield keyword
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Yield keyword is used in Python to pause and resume a generator function.
• Yield keyword is used to return a value from a generator function and pause its execution.

• When the generator function is called again, it resumes from where it was paused.

• Yield can be used in a loop to generate a sequence of values without storing them all in memory.

• Example: def my_generator(): yield 1 yield 2 yield 3
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Q2. How will you n number of parmeters to a function where you n is variable number and you don't know the parameters that will be received
Ans. 
Use variadic arguments in C++ to handle variable number of parameters in a function
• Use variadic arguments in C++ to create a function that can accept any number of parameters

• Example: void myFunction(int firstParam, ...)

• Access the parameters using va_list and va_start macros

• Example: va_list args; va_start(args, firstParam); int nextParam = va_arg(args, int);

• End the argument list with va_end macro
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Q3. SQL join query and use aggregate function in it
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SQL join query combines data from multiple tables based on a related column, and aggregate functions perform calculations on grouped data.
• Use JOIN keyword to combine data from multiple tables based on a related column

• Use aggregate functions like SUM, AVG, COUNT, etc. to perform calculations on grouped data

• Example: SELECT orders.order_id, SUM(order_details.quantity) FROM orders JOIN order_details ON orders.order_id = or
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Q4. Software management framework that I am following, and different scrum terminologies
Ans. 
I follow the Agile software management framework and am familiar with various Scrum terminologies.
• Agile software management framework focuses on iterative development and collaboration.

• Scrum is a specific Agile framework that includes roles like Scrum Master and Product Owner.

• Some Scrum terminologies include Sprint, Daily Standup, Backlog, and User Stories.
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MCQ’s only, DSA and other MCQ 1 hour

Q1. Project related questions
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Q2. Coding problem in any basic programming language
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Q1. General HR and salary discussions
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Q2. Location and other related queries
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Q1. What is your understanding of memory concepts in the C programming language?
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90 min, DSA, hacker platform 3 question

Q1. 2D DP WITH SPACE OPTIMIZATION
Ans. 
2D DP with space optimization is a technique to reduce memory usage while solving dynamic programming problems.
• Use a 1D array instead of a 2D array to store values in dynamic programming problems.

• Update the values in the 1D array based on the dependencies between subproblems.

• Example: Solving the longest common subsequence problem using 2D DP with space optimization.
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Q2. GRAPH WITH BFS ON TREE
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Breadth First Search (BFS) on a tree involves visiting nodes level by level starting from the root.
• Start by visiting the root node, then visit all its children before moving on to the next level

• Use a queue data structure to keep track of nodes to visit next

• Repeat the process until all nodes have been visited
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Q1. Explain Java oops concepts, exceptions, and java 8 features
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Java OOPs concepts include inheritance, polymorphism, encapsulation, and abstraction. Exceptions are used for error handling. Java 8 features include lambda expressions, streams, and functional interfaces.
• OOPs concepts: Inheritance (e.g. class B extends class A), Polymorphism (e.g. method overloading, overriding), Encapsulation (e.g. private variables with public methods), Abstraction (e.g. abstract classes, interfaces...read more
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Q1. Java8 Stream Related Questions
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Q2. Spring Boot Basics
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