Sophisticated C Plus Plus Test - 76+ MCQs: C++ Quiz: Test Your C++ Programming Knowledge with Challenging Questions

1. Which data type is used to store characters in C++?

char

int

float

double

2. How do you declare a variable in C++?

variableType variableName;

name = value;

value variableName;

type variableName = value;

3. How is polymorphism achieved in C++?

Through function overloading only

By using the 'polymorphic' keyword

By using pointers and virtual functions

By declaring a function as 'polymorphic'

4. What is the purpose of the 'inline' keyword in C++?

To define a variable with constant value

To specify that a function should be expanded in line

To declare a function as an internal link

To create an inline virtual function

5. What is the difference between '++i' and 'i++' in C++?

No difference, they are interchangeable

++i increments before the current value is used

i++ increments after the current value is used

++i is used for integers, while i++ is used for floats

6. What is the role of the 'std::thread' class in C++?

To create threads for parallel execution

To manage thread synchronization

To define thread-local variables

To implement multithreading in C++

7. How do you create a multi-line comment in C++?

#* ... *#

// ... //

/* ... */

''' ... '''

8. Which type of loop is controlled by a condition at the end?

for loop

while loop

do-while loop

if-else loop

9. What is a lambda expression in C++?

A function pointer

An anonymous function

A constant function

A function with no parameters

10. What is the purpose of the 'namespace' keyword in C++?

To define a new space for variables

To create a new class

To organize code into a named scope

To declare a new type

11. What is the purpose of 'void' in a function declaration in C++?

To declare a function with no parameters

To indicate the function returns nothing

To declare a variable with no type

To specify a function with variable arguments

12. What is the purpose of the 'virtual' keyword in C++?

To create a pure virtual function

To define a static member function

To enable runtime polymorphism

To declare a constant variable

13. What is the 'auto' keyword used for in C++?

To declare a variable with automatic storage duration

To specify automatic type deduction

To include automatic memory management

To declare an automatic pointer

14. What is the purpose of 'namespace' in C++?

To define a class in C++

To create a user-defined data type

To organize code into separate logical units

To declare a constant variable

15. How do you include the header file 'cmath' in C++?

#include <math.h>

#include <cmath>

#include math.h

#import <cmath>

16. What is the purpose of the 'const' keyword in C++?

To declare a constant variable

To define a class constructor

To allocate memory dynamically

To create a conditional statement

17. In C++, how do you swap the values of two variables without using a third variable?

a = b; b = a;

temp = a; a = b; b = temp;

a += b; b = a - b; a -= b;

a = a ^ b; b = a ^ b; a = a ^ b;

18. What is the role of the 'friend' keyword in C++?

To declare a function that is not a member of the current class

To indicate that a function can be accessed only by the class itself

To specify a function as a friend of another class, allowing it to access private members

To declare a function with unlimited access to any class

19. Explain the concept of smart pointers in C++.

Pointers with high intelligence

Pointers that automatically deallocate memory

Pointers that can point to any data type

Smart pointers are not allowed in C++

20. How is function overloading implemented in C++?

By defining the same function with different return types

By defining functions with the same name but different parameters

By using the 'override' keyword

By using the 'overload' modifier

21. What is the difference between 'delete' and 'delete[]' in C++?

'delete' is used to deallocate memory for a single object, while 'delete[]' is used for arrays

'delete[]' is used to deallocate memory for a single object, while 'delete' is used for arrays

There is no difference between 'delete' and 'delete[]' in C++

Both 'delete' and 'delete[]' are used for dynamic memory allocation

22. How is operator overloading implemented in C++?

By using the 'overload' keyword

By defining functions with the same name but different parameters

Through the 'operator' modifier

By using the 'operator' keyword followed by the operator to be overloaded

23. What is the value of 'true' in C++?

True

Any non-zero value

24. What is the syntax for a single-line comment in C++?

25. How does exception handling work in C++?

By using the 'try', 'catch', and 'finally' blocks

By declaring exceptions in the function signature

By using the 'throw' statement to signal an exception

Exception handling is not supported in C++

26. What is a destructor in C++?

A function that constructs an object

A function that destructs an object

A function that initializes an object

A function that copies an object

27. What is a smart pointer in C++?

A pointer with high intelligence

A pointer that automatically manages memory

A pointer used for polymorphism

A pointer with enhanced performance

28. What is the purpose of 'cout' in C++?

To read input from the user

To write output to the console

To declare a constant variable

To define a class constructor

29. What is the role of the 'typeid' operator in C++?

To identify the type of an object

To compare types of two objects

To define a new data type

To check if an object is of a specific type

30. What is the purpose of the 'auto' keyword in C++11?

To define automatic variables

To automatically allocate memory

To specify automatic type deduction

To create automatic functions

31. What is the 'virtual' keyword used for in C++?

To create virtual machines

To indicate that a function can be overridden in derived classes

To specify that a variable is dynamic

To enable dynamic memory allocation

32. How do you implement multiple inheritance in C++?

C++ does not support multiple inheritance

Using the 'extends' keyword

By defining classes with more than one base class

Using the 'inherit' keyword

33. In C++, what is the 'nullptr' keyword used for?

To represent a null pointer

To define a null variable

To declare a constant pointer

To indicate a null reference

34. What is the purpose of the 'std::algorithm' header in C++?

To define mathematical algorithms

To include commonly used algorithms in C++

To manage file input and output

To implement sorting algorithms

35. What is a reference variable in C++?

A variable used for referencing other variables

A variable referring to an address

A variable that can't be referenced

A variable representing a constant value

36. What is the Rule of Three in C++?

A rule stating that every class should have three member functions

A guideline for managing memory in C++

A rule that prohibits using more than three libraries in a C++ program

A rule related to constructor overloading

37. Explain the use of 'std::move()' in C++.

A function to move the cursor position in the console

A way to move an object without making a copy

A function to move data between different memory locations

A function to move to the next iteration in a loop

38. How is memory allocated for a dynamic array in C++?

Using the 'new' keyword

Automatically by the compiler

Through the 'malloc' function

By declaring it as 'dynamic' in the array declaration

39. What is the difference between 'const' and 'constexpr' in C++?

'const' is used for constant variables, while 'constexpr' is used for constant expressions

'constexpr' is used for constant variables, while 'const' is used for constant expressions

There is no difference between 'const' and 'constexpr' in C++

'const' and 'constexpr' are interchangeable in C++

40. How is dynamic memory allocated in C++?

Using 'auto' keyword

By declaring a variable as 'dynamic'

Through the 'malloc' function

Using 'new' and 'delete' operators

41. What is a template in C++?

A pre-defined code template

A function with a fixed template

A class or function that can work with any data type

A design pattern in C++

42. What is the purpose of the 'const_cast' operator in C++?

To cast a variable to a constant

To cast away the const qualifier

To concatenate strings

To compare constants

43. How are header files used in C++?

To include graphics in a program

To provide a visual representation of code

To declare the structure of a class

To include function prototypes and definitions in multiple files

44. What does the '>>' operator do in C++?

Shift left

Shift right

Bitwise AND

Bitwise OR

45. How is a copy constructor different from an assignment operator in C++?

They perform the same operation

A copy constructor creates a new object, while an assignment operator modifies an existing one

An assignment operator is used for primitive types, while a copy constructor is used for objects

A copy constructor is used for primitive types, while an assignment operator is used for objects

46. Explain the difference between 'stack' and 'heap' in C++ memory management.

Stack is used for static memory allocation, while heap is used for dynamic memory allocation

Stack is used for dynamic memory allocation, while heap is used for static memory allocation

There is no difference between stack and heap in C++ memory management

Both stack and heap are used for static memory allocation

47. What is the purpose of 'friend' functions in C++?

To declare a function as a friend

To allow access to private or protected members of a class

To specify a function as a mutual friend

To create a function for friendly interactions

48. What is the 'cin' object used for in C++?

Console output

File input

Console input

File output

49. In C++, how do you initialize an array of integers with values 1, 2, and 3?

int arr[3] = {1, 2, 3};

int arr[] = {1, 2, 3};

arr[] = {1, 2, 3};

int arr[3] = (1, 2, 3);

50. What is the 'nullptr' keyword used for in C++?

To define a null variable

To initialize pointers to null

To create a null object

To represent an undefined variable

C++ MCQ Test 1