10+ Interview Questions and Answers

Global variables are accessible from any part of the program and can be modified by any function.

• Global variables are declared outside of any function.

• They can be accessed and modified by any function in the program.

• If a function modifies the value of a global variable, the new value is visible to all other functions.

• Global variables can be useful for sharing data between functions.

• However, overuse of global variables can make code harder to understand and maintain.

Pre and post fix operators are used to increment or decrement a value before or after it is used in an expression.

• Pre-fix operator (++x) increments the value of x and returns the new value.

• Post-fix operator (x++) returns the value of x and then increments it.

• Both operators can be used with variables of numeric data types.

• They can also be used with pointers to increment or decrement the memory address they point to.

App life cycle refers to the stages an application goes through from installation to removal.

• App is installed on a device

• App is launched and runs

• App goes into background when not in use

• App may be terminated by the user or system

• App data may be cleared or app uninstalled

Split a linked list into even and odd without changing order.

• Create two new linked lists for even and odd numbers.

• Iterate through the original linked list and append nodes to respective even or odd lists.

• Finally, merge the even and odd lists to get the desired result.

XUnit and NUnit are both unit testing frameworks for .NET, with XUnit being newer and more extensible.

• XUnit is newer and more extensible compared to NUnit

• XUnit uses attributes for test methods while NUnit uses attributes for test fixtures

• XUnit does not support TestFixtureSetUp and TestFixtureTearDown like NUnit

• XUnit has better support for parallel testing compared to NUnit

To remove duplicate variables in a string

• Iterate through the string and keep track of each character

• If a character is already encountered, skip it

• Create a new string with non-duplicate characters

ListView control is a graphical control element used to display a list of items in a vertical, scrollable view.

• Used in GUI applications to display a list of items

• Allows users to scroll through the list

• Can be customized with different layouts and styles

• Commonly used in mobile apps and desktop applications

Implement stack data structure

• Use an array or linked list to store elements

• Push operation adds element to top of stack

• Pop operation removes element from top of stack

• Peek operation returns top element without removing it

Program to transpose a matrix

• Iterate through rows and columns of the matrix

• Swap the elements at (i,j) and (j,i) positions

• Return the transposed matrix

Vectors are dynamic arrays that can change in size, while arrays have a fixed size.

• Vectors can grow or shrink in size dynamically, while arrays have a fixed size.

• Vectors can be resized using functions like push_back() and pop_back(), while arrays cannot.

• Vectors are part of the C++ Standard Template Library (STL), while arrays are a fundamental data structure.

• Example: vector vec; int arr[5];

Microservices are a software development technique where applications are composed of small, independent services that communicate over well-defined APIs.

• Microservices are small, independent services that work together to form a complete application

• Each microservice is responsible for a specific function or feature

• Microservices communicate with each other over well-defined APIs

• Microservices can be developed, deployed, and scaled independently

• Examples of companies using micros...read more

Sort an array of 0s, 1s, and 2s.

• Use three pointers to keep track of the positions of 0s, 1s, and 2s.

• Traverse the array and swap elements to their respective positions.

• Time complexity: O(n), Space complexity: O(1).

Use a hash set to find duplicates in an array of strings.

• Create a hash set to store unique elements.

• Iterate through the array and check if each element is already in the hash set.

• If it is, then it is a duplicate. If not, add it to the hash set.

• Return the duplicates found in the array.

OOP concepts are fundamental principles in object-oriented programming that help in organizing and designing code.

• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Ability of a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation details and showing only the necessary features to the outside ...read more