Contact Info

C++ Interview Questions Answers

Home Computer Science C++

Professional C++ FAQ Questions and Answers

Welcome to our comprehensive Trivia Quiz and interview preparation guide. Below you will find a curated list of popular Trivia Questions and Answers specifically for C++. Whether you are preparing for a technical interview or just testing your knowledge, these FAQ Questions will help you succeed.

What is C++?

C++ is a general-purpose programming language that supports procedural, object-oriented, and generic programming.

Who developed C++ and when?

C++ was developed by Bjarne Stroustrup in 1983.

What are the key features of C++?

Key features include object-oriented programming, operator overloading, templates, and memory management.

What is the difference between C and C++?

C is procedural, while C++ supports object-oriented programming and additional features like classes and templates.

What is a class in C++?

A class is a blueprint for creating objects that encapsulate data and functions.

What is an object in C++?

An object is an instance of a class, representing real-world entities.

What is the difference between struct and class in C++?

In C++, the default access modifier for a struct is public, while for a class, it is private.

What are C++ access specifiers?

Access specifiers include public, private, and protected.

What is a constructor in C++?

A constructor is a special member function that initializes objects of a class.

What is a destructor in C++?

A destructor is a member function that cleans up resources when an object is destroyed.

What is the difference between a shallow copy and a deep copy in C++?

A shallow copy duplicates pointers, while a deep copy duplicates the actual data.

What is operator overloading in C++?

Operator overloading allows defining custom behavior for operators when applied to objects.

What are C++ templates?

Templates enable generic programming by allowing functions and classes to work with any data type.

What is function overloading in C++?

Function overloading allows multiple functions with the same name but different parameter types or counts.

What is function overriding in C++?

Function overriding allows a derived class to provide a specific implementation of a base class method.

What is inheritance in C++?

Inheritance allows a class to derive properties and behavior from another class.

What are the types of inheritance in C++?

Types include single, multiple, multilevel, hierarchical, and hybrid inheritance.

What is polymorphism in C++?

Polymorphism allows functions or methods to operate differently based on the object they act upon.

What is the difference between compile-time and run-time polymorphism in C++?

Compile-time polymorphism is achieved using function overloading and templates; run-time polymorphism is achieved using virtual functions.

What is a virtual function in C++?

A virtual function allows a derived class to override a method of its base class.

What is a pure virtual function?

A pure virtual function is a function declared in a base class and must be overridden in derived classes.

What is an abstract class in C++?

An abstract class has at least one pure virtual function and cannot be instantiated.

What is the difference between new and malloc() in C++?

new initializes objects and calls constructors; malloc() only allocates memory.

What is a namespace in C++?

A namespace prevents name conflicts by encapsulating identifiers in a distinct scope.

What are C++ access modifiers?

Access modifiers control access to class members and include public, private, and protected.

What is the difference between references and pointers in C++?

References are aliases for variables and must be initialized, while pointers store memory addresses and can be reassigned.

What is the purpose of this pointer in C++?

The this pointer points to the current instance of a class.

What is dynamic binding in C++?

Dynamic binding occurs when a function call is resolved at runtime using virtual functions.

What is static binding in C++?

Static binding occurs when a function call is resolved at compile time.

What are smart pointers in C++?

Smart pointers manage memory automatically and include unique_ptr, shared_ptr, and weak_ptr.

What is an inline function in C++?

An inline function is expanded at the point of its call to reduce overhead.

What is the difference between struct and class in C++?

struct members are public by default; class members are private by default.

What are C++ exception handling keywords?

Keywords include try, catch, throw, and finally.

What is the Standard Template Library (STL) in C++?

STL is a library that provides generic classes and functions for data structures and algorithms.

What is a vector in C++?

A vector is a dynamic array that can grow and shrink in size.

What is the difference between vector and array in C++?

vector is dynamic and resizable; array has a fixed size.

What is the difference between stack and heap memory in C++?

Stack memory is used for static and local variables, while heap memory is used for dynamic allocation.

What is a friend function in C++?

A friend function can access private and protected members of a class.

What is function overriding in C++?

Function overriding allows a derived class to provide its implementation of a base class method.

What is the difference between deep copy and shallow copy?

A deep copy duplicates objects, while a shallow copy duplicates references.

What is a static function in C++?

A static function belongs to the class rather than an instance of the class.

What is multiple inheritance in C++?

Multiple inheritance allows a class to inherit from more than one base class.

What is a virtual destructor in C++?

A virtual destructor ensures proper cleanup of derived class resources.

What is RAII in C++?

Resource Acquisition Is Initialization (RAII) manages resources using object lifetimes.

What is the mutable keyword in C++?

The mutable keyword allows a member variable to be modified even in a const object.

What are C++ streams?

Streams are used for input and output operations, such as cin and cout.

What is the role of the virtual keyword in C++?

The virtual keyword enables dynamic binding and polymorphism.

What is the explicit keyword in C++?

The explicit keyword prevents automatic conversions for constructors.

What is the difference between public, protected, and private inheritance in C++?

These determine the visibility of base class members in the derived class.

How do you implement a singleton class in C++?

Use a private constructor, a static method, and a static instance to implement a singleton.