VVDN Technologies Software Engineer Interview Questions and Answers

A pointer is a variable that stores the memory address of another variable, enabling direct memory access and manipulation.

• Pointers are used in languages like C and C++ to manage memory efficiently.

• Example: int *ptr; // ptr is a pointer to an integer.

• Pointers can be dereferenced to access the value at the memory address they point to.

• Example: *ptr = 10; // assigns 10 to the integer variable pointed by ptr.

• Pointers...read more

When a device is powered on, several processes occur including booting up the operating system, initializing hardware components, loading necessary drivers, and launching user interface.

• Booting up the operating system

• Initializing hardware components

• Loading necessary drivers

• Launching user interface

Java is a versatile programming language used for building applications across various platforms.

• Java is object-oriented, promoting code reusability and modularity. Example: Using classes and objects to model real-world entities.

• Java has a rich standard library that supports data structures, networking, and GUI development. Example: Using ArrayList for dynamic arrays.

• Java runs on the Java Virtual Machine (JVM), al...read more

Program to print a pattern of stars in a specific shape.

• Use nested loops to print the stars in the desired pattern.

• The number of stars in each row increases by one until the middle row, then decreases by one.

• The number of spaces between the stars decreases by one until the middle row, then increases by one.

Classes are templates for creating objects, functions are blocks of code that perform a specific task, and objects are instances of a class.

• Classes define the properties and methods of an object

• Functions are reusable blocks of code that can take input and return output

• Objects are created from a class and have their own unique properties and methods

• Example: Class - Car, Function - startEngine(), Object - myCar

Program to check if a given string is a palindrome

• Remove all non-alphanumeric characters from the string

• Convert the string to lowercase

• Reverse the string and compare with the original string

Encapsulation is a fundamental OOP principle that restricts direct access to an object's data and methods.

• Encapsulation helps in data hiding, protecting object integrity.

• It allows controlled access through public methods (getters/setters).

• Example: A class 'BankAccount' with private balance and public methods to deposit/withdraw.

• Encapsulation promotes modularity and maintainability in code.

Digital modulation techniques are methods used to encode digital information onto an analog carrier signal.

• Amplitude Shift Keying (ASK)

• Frequency Shift Keying (FSK)

• Phase Shift Keying (PSK)

• Quadrature Amplitude Modulation (QAM)

• Orthogonal Frequency Division Multiplexing (OFDM)