10+ Diebold Nixdorf Software Engineer Interview Questions and Answers

Polymorphism is the ability of an object to take on many forms. Constructors and destructors are special methods in classes.

• Polymorphism allows objects to be treated as instances of their own class or as instances of their parent class.

• Constructors are used to initialize objects when they are created. Destructors are used to clean up after an object when it is destroyed.

• Classes are templates for creating objects. They define the properties and methods that an object will have...read more

Mergesort is a divide-and-conquer algorithm that sorts an array by dividing it into two halves, sorting each half, and merging them.

• Divide the array into two halves

• Sort each half recursively

• Merge the two sorted halves

• Repeat until the entire array is sorted

• Example: ['apple', 'banana', 'cherry', 'date'] -> ['apple', 'banana', 'cherry', 'date'] -> ['apple', 'banana'], ['cherry', 'date'] -> ['apple'], ['banana'], ['cherry'], ['date'] -> ['apple', 'banana'], ['cherry', 'date'] -> ...read more

Data can be passed in Angular from component to component using input properties, output properties, services, and state management libraries like NgRx.

• Use @Input decorator to pass data from parent to child component

• Use @Output decorator to emit events from child to parent component

• Use services to share data between components

• Use state management libraries like NgRx for complex data sharing scenarios

Check if a string is palindrome or not

• Reverse the string and compare with original

• Compare characters from start and end of string

• Ignore spaces and punctuation marks while comparing

Remove duplicates in linked lists

• Traverse the linked list and keep track of visited nodes using a hash table

• If a node is already visited, remove it from the linked list

• Time complexity: O(n), Space complexity: O(n)

GATE is not my preferred choice as I am more interested in software development than research.

• I am more interested in practical application of software development than theoretical research

• I believe my skills and interests align better with software engineering roles

• I have researched and found that software engineering roles do not require a GATE qualification

Reverse words in a string

• Split the string into an array of words

• Reverse the array

• Join the array into a string

Encapsulation is the process of hiding implementation details and exposing only the necessary information to the user.

• Encapsulation is achieved through access modifiers like public, private, and protected.

• It helps in achieving data abstraction and information hiding.

• Encapsulation provides better control over the data and prevents unauthorized access.

• Example: A class with private variables and public methods to access those variables.

• Encapsulation is one of the four fundamenta...read more

Reverse a given string

• Create an empty string

• Iterate through the original string in reverse order

• Append each character to the empty string

• Return the reversed string

Code to check if a given string is a palindrome or not.

• Create a function that takes a string as input

• Remove all non-alphanumeric characters and convert to lowercase

• Compare the original string with its reverse to check for palindrome