24/7 Customer Software Engineer Interview Questions and Answers

C++ program to reverse a string

• Use a loop to iterate through the string

• Swap the characters at the beginning and end of the string

• Continue swapping until the middle of the string is reached

Serialize a tree data structure

• Use pre-order traversal to serialize the tree

• Store null values as a special character

• Use a delimiter to separate nodes

• Example: 1,2,null,null,3,4,null,null,5,null,null

• Deserialize by splitting the string and using a queue

AngularJS is a JavaScript framework for building dynamic web applications.

• AngularJS is a client-side MVC framework.

• It allows developers to build single-page applications.

• It extends HTML with new attributes and tags.

• AngularJS uses two-way data binding to automatically synchronize data between the model and the view.

• It provides dependency injection and modularization features.

• Some popular examples of websites built with

A directive is a programming construct that provides instructions to a compiler or interpreter.

• Directives are used to control the behavior of a program or to provide additional information to the compiler or interpreter.

• They are typically written as special comments or statements in the code.

• Examples of directives include #include in C/C++ to include header files, #pragma to control compiler-specific behavior, and #def

A factory is a design pattern that provides an interface for creating objects of a certain class.

• A factory encapsulates the object creation logic and hides it from the client.

• It allows the client to create objects without knowing the specific class or implementation details.

• Factories can be used to create different types of objects based on certain conditions or parameters.

• They promote loose coupling and flexibility in...read more

Services are software components that perform specific tasks or provide functionality to other software applications.

• Services are self-contained and independent modules that can be accessed by other software components.

• They can be used to handle business logic, data processing, communication with external systems, etc.

• Examples of services include web services, microservices, RESTful APIs, and cloud services.

• Services ca...read more

A factory is responsible for creating and managing objects, while a service is responsible for providing specific functionality or performing tasks.

• A factory is used to create and initialize objects, often based on certain parameters or configurations.

• A service is a component that provides specific functionality or performs tasks for other components or systems.

• Factories are commonly used in object-oriented programming...read more

A program to sort an array of strings.

• Use a sorting algorithm like bubble sort, insertion sort, or quicksort.

• Compare strings using a comparison function.

• Implement the sorting algorithm in a function that takes the array as input and modifies it in place.

This program displays words separated by spaces.

• Use an array of strings to store the words.

• Iterate through the array and print each word followed by a space.

• Exclude the space after the last word.

A provider is a software component or service that supplies data, functionality, or resources to other software applications.

• A provider is responsible for delivering data, services, or resources to other software components or applications.

• Providers can be APIs, libraries, frameworks, or any other software component that offers functionality to other software.

• Examples of providers include database management systems, c

The $watch and $digest are two important concepts in AngularJS for data binding and updating the view.

• $watch is a function in AngularJS that allows you to watch for changes in a specific variable or expression.

• $digest is a function in AngularJS that triggers a process called the digest cycle, which updates the bindings and synchronizes the model and view.

• The $watch function takes two parameters: the variable or express...read more

ng-repeat is a directive in AngularJS used to repeat HTML elements for each item in an array.

• ng-repeat is used to create a loop in AngularJS

• It is commonly used to display a list of items from an array

• The directive is placed on an HTML element and uses the 'item in array' syntax

• It can also be used with filters and sorting

• Example:

• {{ item }}

ng-getValue is not a standard attribute in Angular. It may be a custom directive or a typo.

• Check if ng-getValue is a custom directive or attribute in your Angular application

• Verify if it is being used correctly in the HTML template

• If it is a typo, correct it to the appropriate attribute or directive

Developing CSS without using bootstrap involves writing custom CSS code to style web pages.

• Write CSS code to define styles for HTML elements

• Use CSS selectors to target specific elements

• Apply CSS properties to modify the appearance of elements

• Create media queries for responsive design

• Implement CSS animations and transitions

• Optimize CSS code for performance

CDN stands for Content Delivery Network. It is a distributed network of servers that deliver web content to users based on their geographic location.

• CDN improves website performance by reducing latency and increasing page load speed.

• CDN caches content in multiple locations, allowing users to access it from a server closest to them.

• CDN can handle high traffic loads and distribute it across multiple servers.

• Popular CDN p...read more

To display different colors in a table using CSS for odd and even rows, you can use the :nth-child() selector.

• Use the :nth-child(odd) selector to target odd rows and apply a specific color using the background-color property.

• Use the :nth-child(even) selector to target even rows and apply a different color using the background-color property.

• For example, you can use CSS code like this: tr:nth-child(odd) { background-c...read more

To develop CSS for different devices, use media queries, responsive design principles, and testing on various devices.

• Use media queries to apply different CSS styles based on the device's screen size

• Follow responsive design principles to ensure the layout adapts to different devices

• Test the CSS on various devices to ensure compatibility and responsiveness

The $rootscope is a service in AngularJS that provides a global scope for sharing data between controllers.

• It is a part of the AngularJS framework.

• It is used to share data between controllers.

• It is a singleton object accessible throughout the application.

• It can be used to broadcast and listen to events.

jQuery is a fast, small, and feature-rich JavaScript library that simplifies HTML document traversal and manipulation, event handling, and animation.

• jQuery is a JavaScript library.

• It simplifies HTML document traversal and manipulation.

• It provides easy event handling and animation.

• jQuery is fast, small, and feature-rich.