C++ Concepts Quesions

START LEARNING

#1. What is C++ primarily known as?

A scripting language

An object-oriented programming language

A functional programming language

A markup language

#2. Which of the following is used to define a class in C++?

structure

module

class

define

#3. What does the #include directive do in C++?

Declares functions

Imports libraries

Compiles the code

Initializes variables

#4. Which operator is used to access members of a class through an object?

#5. What is the correct syntax to create a pointer in C++?

int ptr;

int ptr*;

int* ptr;

*int ptr;

#6. Which keyword is used to prevent a function from being overridden in C+

override

final

constant

virtual

#7. How is memory dynamically allocated in C++?

calloc()

new

allocate

malloc()

#8. What is the default return type of a C++ function?

float

double

void

int

#9. Which of the following is an access specifier in C++?

static

hidden

public

secure

#10. What is the use of the this pointer in C++?

To define a namespace

To create a virtual function

To refer to the current object

To access static members

#11. What is a constructor in C++?

A destructor

A member variable

A function with the same name as the class

A static function

#12. Which operator is overloaded for object creation in C++?

new

sizeof

#13. What is the output of cout << 5 / 2;?

2.5

#14. What is an abstract class in C++?

A class with at least one pure virtual function

A class with no members

A class with all member functions defined

A class without a constructor

#15. What is the function of the virtual keyword in C++?

To enable function overriding

To create a static function

To define a macro

To create a real function

#16. Which STL container stores elements in key-value pairs?

vector

deque

list

map

#17. What is the default access level of members in a class?

private

static

public

protected

#18. What is the size of an empty class in C++?

1 byte

8 bytes

4 bytes

0 bytes

#19. What does the friend keyword do in C++?

Creates a copy of the class

Restricts access to a function

Allows a non-member function to access private members

Enables inheritance

#20. What is the role of a destructor in C++?

Overloads operators

Allocates memory

Initializes objects

Frees resources allocated to an object

#21. Which of these is a valid syntax for a namespace?

namespace sample { }

space sample { }

class sample { }

namespace:sample { }

#22. Which operator is not overloadable in C++?

#23. Which function is used to read a line of text in C++?

read()

getline()

cin()

scanf()

#24. What is polymorphism in C++?

A way to reuse code

The ability to take multiple forms

A type of constructor

A type of inheritance

#25. What does std stand for in C++?

Structure definition

Storage device

Standard

Static declaration

#26. What is the purpose of the static keyword in C++?

Defines a global variable

Declares a private function

Shares a variable among all objects

Creates a local copy

#27. What does public inheritance mean in C++?

All base class members become private

All members become public

Derived class cannot access the base class

Public and protected members remain accessible

#28. Which header file includes the definition for input-output streams?

stdlib.h

input.h

iostream

stdio.h

#29. Which of these is not a C++ loop construct?

while

foreach

for

do-while

#30. What is RAII in C++?

A way to allocate resources

A memory leak error

Resource Allocation Is Initialization

A type of constructor

#31. What does cin represent in C++?

Standard output stream

Standard input stream

Character input

File input stream

#32. What is an iterator in C++?

A memory allocator

A data type

A loop variable

A pointer-like object for traversing a container

#33. Which of these is a valid function declaration in C++?

int function(int x);

int x function();

function int(int x);

declare function(int x): int;

#34. Which keyword is used to handle exceptions in C++?

try

throw

All of the above

catch

#35. What is the return type of main() in C++?

double

void

int

string

#36. What is nullptr in C++?

An undefined variable

A null array

A null value for strings

A null pointer constant

#37. Which of these is a characteristic of a template in C++?

It handles input-output operations

It is used for defining constants

It allows code reuse for different data types

It defines a function only for integers

#38. What is the purpose of the virtual keyword in C++?

To enable late binding

To define a destructor

To declare a function as static

To make a function pure virtual

#39. What is the default value of an uninitialized pointer in C++?

NULL

Undefined

nullptr

#40. What does the delete operator do in C++?

Allocates memory

Deletes static variables

Deletes functions

Frees dynamically allocated memory

Finish

Results

Congratulations !

Opps! Try Again

For More Information Visit : – India gk

Contact for website Design and development – Chaturbhuja Sons

Menus 📃

Indian Insights 📖

Important QA (महत्वपूर्ण प्र. उ. )

Lifestyle and Entertainment (जीवनशैली और मनोरंजन)

CodeQuest 📖

Web Design

JavaScript & Frameworks

Programming Languages

Database & SQL (Coming soon)

SOCIAL SHARING 🖐

Welcome to CodeQuest

HTML, CSS & Bootstrap