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

1. 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

2. Which header file is used for input and output functions in C++?

iostream.h

inputoutput.h

stdio.h

iostream

3. 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

4. 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

5. 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

6. What is the RAII (Resource Acquisition Is Initialization) principle in C++?

A technique for initializing resources before acquiring them

A principle that states resources should be acquired before being initialized

A design pattern where resource management is tied to object lifetime

A programming paradigm for handling exceptions in C++

7. What does the 'sizeof' operator return in C++?

Size of the variable

Size of the memory block

Number of elements in an array

Size of the type

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

variableType variableName;

name = value;

value variableName;

type variableName = value;

9. Explain the concept of move semantics in C++.

A technique for efficient resource management

A way to move objects between different memory locations

A method to optimize function calls

Move semantics is not supported in C++

10. 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

11. Explain the difference between 'malloc' and 'new' in C++.

They are interchangeable, both used for dynamic memory allocation

Only 'malloc' is used for memory allocation

Only 'new' is used for memory allocation

Neither 'malloc' nor 'new' is used for memory allocation

12. What is the result of the expression '5 + 3 * 2' in C++?

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

Shift left

Shift right

Bitwise AND

Bitwise OR

14. 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

15. What is the difference between 'override' and 'final' in C++?

'override' is used to indicate that a function overrides a virtual function, while 'final' indicates that a class cannot be inherited

'final' is used to indicate that a function overrides a virtual function, while 'override' indicates that a class cannot be inherited

There is no difference between 'override' and 'final' in C++

Both 'override' and 'final' are used to prevent function overriding

16. 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'

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

True

Any non-zero value

18. 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

19. In C++, what is the 'sizeof' operator used for?

To determine the size of a variable

To find the square root

To concatenate strings

To calculate the average

20. How do you declare a constant in C++?

const variableType constantName = value;

variableType constantName = value;

constant variableType constantName = value;

constantName = const variableType value;

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

char

int

float

double

22. How is exception handling done in C++?

Using 'try' and 'catch' blocks

Using 'if' statements

Through 'switch' statements

By using 'finally' blocks

23. 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

24. How is a reference different from a pointer in C++?

References cannot be used for dynamic memory allocation

Pointers cannot be used for function parameters

References cannot be used to access array elements

Pointers cannot be used in object-oriented programming

25. 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

26. What does the 'endl' manipulator do in C++?

Ends the program

Ends a loop

Ends a line and flushes the buffer

Ends a function

27. 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

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 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

30. 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++

C++ MCQ Test 3