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

1. 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

2. 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

3. 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

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

Console output

File input

Console input

File output

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

6. 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++

7. 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

8. 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

9. 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'

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

Using 'try' and 'catch' blocks

Using 'if' statements

Through 'switch' statements

By using 'finally' blocks

11. What does the 'this' pointer refer to in C++?

Current object

Previous object

Next object

Global object

12. 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

13. 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

14. 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++

15. 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

16. 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

17. 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

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

variableType variableName;

name = value;

value variableName;

type variableName = value;

19. 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

20. Explain the difference between pass by value and pass by reference in C++.

Pass by value copies the actual parameter, while pass by reference uses the address of the actual parameter

Pass by value is faster than pass by reference

Pass by reference copies the actual parameter, while pass by value uses the address of the actual parameter

There is no difference between pass by value and pass by reference in C++

C++ MCQ Test 4