NCR Corporation Software Engineer III Interview Questions and Answers

Q1. Explain advantages of Angular
Ans. 
Angular offers advantages such as two-way data binding, dependency injection, and modular architecture.
• Two-way data binding allows automatic synchronization of data between the model and the view, reducing the need for manual DOM manipulation.

• Dependency injection helps manage dependencies and promotes code reusability by allowing components to be easily injected with their dependencies.

• Modular architecture enables deve...read more
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Q2. Explain about ngmodel
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ngModel is a directive in AngularJS that binds the value of HTML controls to application data.
• ngModel is used for two-way data binding in AngularJS.

• It can be used with input, select, textarea, and custom form controls.

• Example:
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Q1. Java coding questions
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Q2. Core java and spring questions
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Q1. Salary expectation
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Q1. Asked to explain past project and contribution
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Q2. Write sql querying to count employees per department
Ans. 
SQL query to count employees per department
• Use GROUP BY clause to group employees by department

• Use COUNT() function to count the number of employees in each department

• Join the employee table with the department table if necessary
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Q3. Write a program using Java Stream API
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Program using Java Stream API to filter even numbers from a list
• Create a list of numbers

• Use stream() method to convert list to stream

• Use filter() method with lambda expression to filter even numbers

• Collect the filtered numbers using collect() method
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Q4. Questions related to Java 8 features
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Q1. Java questions and basics of testing
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Easy and general coding questions and communication round

Q1. Introduction about us
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Q2. Strengths and weakness
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Q1. Java 8 questions were asked
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Q2. Database related,Spring
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Q1. Introduction about your work and Tech work
Ans. 
I have been working as a Software Engineer for the past 5 years, specializing in developing web applications using Java and JavaScript.
• Proficient in Java and JavaScript

• Experience in developing web applications

• Strong understanding of software development principles

• Familiarity with agile methodologies

• Knowledge of database management systems

• Experience with version control systems like Git

• Ability to work in a team and comm
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Q2. All Details of OOPs concepts
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Q3. Write a code by using OOPs technology result doesn't matter approach will be considered
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Coding Round two questions with OOPs concepts

Q1. Explain center limit theorm
Ans. 
The center limit theorem states that the sum or average of a large number of independent and identically distributed random variables will tend towards a normal distribution.
• The theorem applies to a wide range of distributions, not just normal distributions.

• It is often used in statistical analysis to estimate population parameters.

• The theorem assumes that the random variables are independent and identically distributed...read more
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Q2. Difference between covariance and correlation
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Covariance measures how two variables vary together, while correlation measures the strength of their linear relationship.
• Covariance can be positive, negative, or zero, indicating the direction of the relationship between the variables.

• Correlation ranges from -1 to 1, with 0 indicating no linear relationship and -1 or 1 indicating a perfect negative or positive linear relationship, respectively.

• Covariance is affected b...read more
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Q3. Basics of performance matrix
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Q1. How embeddings works
Ans. 
Embeddings are a way to represent words or phrases as vectors in a high-dimensional space.
• Embeddings are learned through neural networks that analyze large amounts of text data.

• They capture semantic and syntactic relationships between words.

• They are used in natural language processing tasks such as language translation and sentiment analysis.

• Popular embedding models include Word2Vec and GloVe.
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Q2. How word2vec is generated
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word2vec is a neural network model used to generate word embeddings.
• word2vec uses a shallow neural network with one input layer, one hidden layer, and one output layer.

• It learns to predict the context of a word by training on a large corpus of text.

• The output of the hidden layer is used as the word embedding.

• There are two approaches to word2vec: continuous bag of words (CBOW) and skip-gram.

• CBOW predicts a word given it...read more
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Q3. If client ask you improve the performance of the model without changing architect and data what will be your first step
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Q4. What is an API? how to deploy it
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API stands for Application Programming Interface. It is a set of protocols and tools for building software applications.
• API is a way for different software components to communicate with each other

• It defines how software components should interact with each other

• API can be deployed on a server or cloud platform

• API can be accessed through HTTP requests

• API documentation is important for developers to understand how to us
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Q1. Some basic HR questions and negotiations
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Merit and demerit of Machine learning ?

General Aptitude and reasoning

Q1. Oops concept, DBMS , Data Structure
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Q2. What is Normalisation?
Ans. 
Normalisation is the process of organizing data in a database to reduce redundancy and improve data integrity.
• It involves dividing larger tables into smaller ones and defining relationships between them.

• Normalization helps to eliminate data inconsistencies and anomalies.

• There are different levels of normalization, such as first normal form (1NF), second normal form (2NF), and so on.

• Normalization can improve database pe...read more
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Q3. What is polimorphism?
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Polymorphism is the ability of an object to take on many forms.
• It allows objects of different classes to be treated as if they were objects of the same class.

• It is achieved through method overriding and method overloading.

• Example: A shape class can have multiple subclasses like circle, square, etc. and all can be treated as shapes.

• Example: A method can take an object of a parent class as a parameter and it can accept a
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Q4. What is Stack and Pre and post Tree formation
Ans. 
Stack is a data structure that follows LIFO. Pre and post tree formation are methods of traversing a tree.
• Stack is used for backtracking, undoing, and recursion.

• Pre-order traversal visits the root node first, then left subtree, then right subtree.

• Post-order traversal visits the left subtree, then right subtree, then root node.
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Q1. Tell me about yourself
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Q2. Tell me About company ?
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Round duration - 90 minutes
Round difficulty - Medium

Q1. 
Height of a Binary Tree
You are provided with an arbitrary binary tree consisting of 'N' nodes where each node is associated with a certain value. The task is to determine the height of the tree.
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Ans. 
The height of a binary tree is the maximum number of edges from the root to a leaf node.
• Traverse the tree recursively and keep track of the maximum height

• If the current node is null, return 0

• Otherwise, calculate the height of the left and right subtrees and return the maximum height plus 1
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Q2. 
Trapping Rain Water Problem Statement
You are given a long type array/list ARR of size N, representing an elevation map. The value ARR[i] denotes the elevation of the ith bar. Your task is to determine th...read more
Ans. 
The question asks to calculate the total amount of rainwater that can be trapped in the given elevation map.
• Iterate through the array and find the maximum height on the left and right side of each bar.

• Calculate the amount of water that can be trapped on each bar by subtracting its height from the minimum of the maximum heights on both sides.

• Sum up the trapped water for all bars and return the total amount.
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Round duration - 45 minutes
Round difficulty - Medium

Q1. 
Merge Two Sorted Arrays Problem Statement
Given two sorted integer arrays ARR1 and ARR2 of size M and N, respectively, merge them into ARR1 as one sorted array. Assume that ARR1 has a size of M + N to hol...read more
Ans. 
The task is to merge two sorted arrays into one sorted array.
• Create a new array with size M + N to store the merged array

• Use two pointers to iterate through the elements of ARR1 and ARR2

• Compare the elements at the current pointers and add the smaller element to the new array

• Move the pointer of the array from which the element was added

• Repeat the process until all elements are merged

• If there are remaining elements in AR...read more
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