Apollo Computers React Js Frontend Developer Interview Questions and Answers

C language is a general-purpose, procedural computer programming language.

• Developed by Dennis Ritchie at Bell Labs in 1972

• Used for system programming, embedded systems, and application software

• Influenced many other programming languages such as C++, Java, and Python

Count the number of pairs in an array whose sum is equal to a given number k.

• Iterate through the array and for each element, check if k minus the element exists in the array.

• Use a hash table to store the frequency of each element in the array.

• If the array contains duplicates, handle them separately to avoid overcounting.

• Time complexity can be improved to O(n) using a two-pointer approach.

Abstract class is a class that cannot be instantiated and is used as a base class for other classes.

• An abstract class can have abstract and non-abstract methods.

• Abstract methods have no implementation and must be implemented by the derived class.

• An abstract class can have constructors and fields.

• An abstract class can be used to define a common interface for a group of related classes.

• Example: Animal is an abstract clas...read more

I am a software developer with experience in various programming languages and a passion for creating innovative solutions.

• Proficient in Java, C++, and Python

• Experience with web development using HTML, CSS, and JavaScript

• Familiarity with agile development methodologies

• Strong problem-solving and analytical skills

• Excellent communication and teamwork abilities

Array is a collection of elements of same data type. Linked list is a data structure where each element points to the next one.

• Arrays have fixed size, linked lists can grow dynamically

• Accessing elements in an array is faster than in a linked list

• Inserting or deleting elements in a linked list is faster than in an array

• Arrays are stored in contiguous memory locations, linked lists are not

• Arrays are used for random acces

The OSI model is a conceptual model that describes the communication functions of a telecommunication or computing system.

• The OSI model has 7 layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has a specific function and communicates with the layers above and below it.

• The Physical layer deals with the physical transmission of data, while the Application layer deals with u...read more

The OSI model is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system.

• The OSI model has 7 layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has a specific function and communicates with the layers above and below it.

• The Physical layer deals with the physical transmission of data, while the Applicati...read more