V2soft Mobile Application Developer Interview Questions and Answers for Experienced

getch() is a function in C that reads a single character from the keyboard without echoing it.

• getch() is defined in the header file.

• It is commonly used to read single characters for menu selection or password input.

• The character read by getch() is not displayed on the screen.

• getch() is a blocking function, meaning it waits for user input before proceeding.

• Example: char ch = getch();

Polymorphism is the ability of an object to take on many forms. In Java, it is achieved through method overriding and interfaces.

• Polymorphism allows objects of different classes to be treated as if they are of the same class.

• Method overriding is when a subclass provides its own implementation of a method that is already defined in its superclass.

• Interfaces allow for polymorphism by defining a set of methods that a clas...read more

POST and GET are HTTP methods used to send data to a server. POST is used to send data in the request body while GET sends data in the URL.

• POST is more secure as it doesn't expose data in the URL

• GET has a limit on the amount of data that can be sent

• POST is used for submitting forms, uploading files, etc.

• GET is used for fetching data from the server

• Examples: POST - submitting a login form, GET - fetching search results

Windows OS is a proprietary operating system developed by Microsoft while Ubuntu is a free and open-source operating system based on Linux.

• Windows OS is more widely used in desktops and laptops while Ubuntu is popular among developers and servers.

• Windows OS has a graphical user interface (GUI) while Ubuntu can be used with or without a GUI.

• Windows OS has a larger selection of software and games available while Ubuntu h...read more

64-bit architecture allows for larger memory addressing and faster processing speeds.

• 64-bit architecture can address more memory than 32-bit architecture

• 64-bit architecture can perform more calculations per clock cycle

• 64-bit architecture is required for certain software applications, such as video editing or scientific simulations

Sorting is the process of arranging data in a particular order.

• Sorting is used to organize data for easier access and retrieval.

• There are various sorting algorithms such as bubble sort, insertion sort, quicksort, etc.

• Sorting can be done in ascending or descending order.

• Examples of sorting include sorting a list of names alphabetically or sorting a list of numbers in numerical order.

Heap sorting is a comparison-based sorting algorithm that divides the input into a sorted and an unsorted region, while insertion sorting builds the final sorted array one item at a time.

• Heap sorting has a worst-case time complexity of O(n log n), while insertion sorting has a worst-case time complexity of O(n^2)

• Heap sorting is not an in-place sorting algorithm, while insertion sorting is

• Heap sorting is more efficient ...read more

Type casting is the process of converting a variable from one data type to another.

• It is also known as type conversion.

• It can be done implicitly or explicitly.

• Explicit type casting involves the use of casting operators.

• Examples include converting an integer to a string or a float to an integer.

• Type casting can lead to loss of data or precision.

Inheritance is a mechanism in OOP where a new class is derived from an existing class.

• Single Inheritance: A derived class inherits from a single base class.

• Multiple Inheritance: A derived class inherits from multiple base classes.

• Multilevel Inheritance: A derived class is created from another derived class.

• Hierarchical Inheritance: Multiple derived classes inherit from a single base class.

• Hybrid Inheritance: Combinatio

The source code for doubly linked list is a data structure that contains nodes with pointers to the previous and next nodes.

• Declare a node struct with data, prev, and next pointers

• Create a head and tail pointer to the first and last nodes

• Implement functions to add, remove, and traverse nodes