Top 150 C++ Interview Questions and Answers

Classes in C++ are user-defined data types that encapsulate data and functions.

• Classes are used for object-oriented programming.

• They allow for data abstraction and encapsulation.

• Classes can have member variables and member functions.

• Objects are insta...read more

File handling refers to the process of managing and manipulating files on a computer system.

• File handling involves tasks such as creating, reading, writing, updating, and deleting files.

• Common file operations include opening a file, reading its conte...read more

DifferentJava and XLC++ are programming languages with distinct features and use cases in software development.

• DifferentJava is a variant of Java, focusing on enhanced features for specific applications.

• XLC++ is a C++ compiler from IBM, optimized for...read more

ref and out are C# keywords for passing arguments by reference, allowing methods to modify the original data.

• ref requires the variable to be initialized before being passed. Example: 'int x = 10; SomeMethod(ref x);'

• out does not require initialization...read more

Python can be embedded in C++ using the Python/C API.

• Include the Python header files in the C++ code.

• Initialize the Python interpreter in the C++ code.

• Call Python functions from C++ code using the Python/C API.

• Pass data between Python and C++ using P...read more

Assembly language can be embedded in C++ using inline assembly or by linking assembly files.

• Inline assembly can be used to write assembly code directly in C++ code.

• Assembly files can be linked with C++ code using the linker.

• Inline assembly can be pla...read more

Overheating in electronics can lead to performance issues and damage. Proper cooling and maintenance are essential.

• Ensure proper ventilation around devices to allow heat dissipation.

• Use heat sinks or fans to enhance cooling, especially in high-perfor...read more

Data structures in C++ are used to organize and store data efficiently.

• C++ provides various built-in data structures like arrays, linked lists, stacks, queues, trees, and graphs.

• These data structures can be used to store and manipulate data in an eff...read more

Swapping two variables can be done using a temporary variable, arithmetic operations, or bitwise XOR.

• Using a temporary variable: Example: int a = 5, b = 10; int temp = a; a = b; b = temp;

• Using arithmetic operations: Example: int a = 5, b = 10; a = a ...read more

Managing buffer space in C++ involves careful allocation, deallocation, and monitoring of memory usage to prevent leaks and overflows.

• Use dynamic memory allocation with 'new' and 'delete' to manage buffer sizes based on runtime requirements.

• Utilize s...read more

Templates are pre-designed formats that streamline processes and ensure consistency in various applications.

• Templates provide a standardized structure for documents, presentations, and models.

• In modeling, templates can be used to create consistent da...read more

I have worked with various payroll software including ADP, Paychex, and QuickBooks.

• ADP

• Paychex

• QuickBooks

Design patterns in C++ are reusable solutions to common problems in software design.

• Design patterns help in creating flexible, maintainable, and scalable code.

• Examples of design patterns in C++ include Singleton, Factory, Observer, and Strategy.

• Each ...read more

Concurrency in C++ allows multiple tasks to run simultaneously, improving performance and efficiency.

• Concurrency in C++ can be achieved using threads, mutexes, condition variables, and atomic operations.

• Threads allow multiple functions to run concurr...read more

Lambda expressions are anonymous functions that can be used to create concise and readable code.

• Lambda expressions are used to create inline functions without a formal definition.

• They are often used in functional programming languages like Java, Pyth...read more

Go is simpler, more efficient, and easier to learn compared to C++.

• Go has a simpler syntax and is easier to read and write compared to C++.

• Go has built-in concurrency support with goroutines and channels, making it easier to write concurrent programs...read more

The 'this' keyword in JavaScript refers to the current object or context.

• Used to refer to the current object within a method

• Helps avoid naming conflicts with global variables

• Can be used to call another method within the same object

The new operator is used to create an instance of a class or to allocate memory for an array.

• The new operator is used to create objects in Java.

• It is used to allocate memory for an array.

• The new operator is followed by the name of the class or array ...read more

To declare a file in software development, you typically need to specify the file type, name, and location.

• Use a file declaration statement in the programming language you are using (e.g. 'File myFile = new File("example.txt");' in Java)

• Specify the f...read more

C++ and Java are programming languages used for software development.

• C++ is a high-performance language used for system programming, game development, and other performance-critical applications.

• Java is an object-oriented language used for developing...read more

C++ is a statically typed language with a focus on performance and low-level memory manipulation, while Python is dynamically typed and emphasizes readability and simplicity.

• C++ is statically typed, meaning variable types must be declared at compile ...read more

Data structures in C++ are used to store and organize data efficiently.

• Data structures like arrays, linked lists, stacks, queues, trees, and graphs are commonly used in C++ programming.

• Arrays are used to store a collection of elements of the same dat...read more

You can find the size of an array in C or C++ by dividing the total size of the array by the size of one element.

• Calculate the total size of the array by multiplying the number of elements by the size of each element.

• Divide the total size by the size...read more

Python is easier to learn, has simpler syntax, and is more versatile than C++.

• Python has a simpler syntax and is easier to read and write than C++.

• Python is an interpreted language, which means it doesn't need to be compiled before running.

• Python has...read more

Yes, the string class can be extended in most programming languages.

• Inheritance can be used to extend the functionality of the string class.

• By creating a new class that inherits from the string class, additional methods and properties can be added.

• Ex...read more

QPointer is a deprecated Qt class used for storing and managing pointers.

• QPointer is used to avoid dangling pointers in Qt applications.

• It is a template class that can be used with any QObject-derived class.

• QPointer is now deprecated and replaced by ...read more

dpointer is a Qt framework concept used for efficient memory management.

• dpointer is a private implementation pointer.

• It is used to hide implementation details from the public API.

• dpointer allows for copy-on-write semantics.

• It reduces memory usage and...read more