7/10 -- Test Your C++ Knowledge with the CPP Questions Quiz!

1. Which of the following is a correct way to initialize a std::vector in C++?

std::vector<int> v = {1, 2, 3};

std::vector<int> v = 1, 2, 3;

std::vector<int> v(1, 2, 3);

std::vector<int> v(1, 2, 3, 4);

2. What is the output of the following code? int main() { int a = 10; int b = 20; swap(a, b); cout << a << " " << b; return 0; }

10 20

20 10

Compiler error

Runtime error

3. Which C++ feature allows a function or an operator to be defined for multiple data types?

Polymorphism

Inheritance

Overloading

Encapsulation

4. What is the primary use of the 'std::unique_ptr' class in C++?

To ensure only one reference to a dynamically allocated object

To allow multiple references to a dynamically allocated object

To provide reference counting for dynamic objects

To create arrays of dynamic objects

5. Which keyword is used to prevent a method from being overridden in a derived class?

static

final

const

override

6. In C++, what is the purpose of the 'decltype' specifier?

To define a new type

To automatically deduce the type of an expression

To declare a variable constant

To delete a dynamically allocated object

7. What does the following code print? #include <iostream> void func(const int& x) { std::cout << x << std::endl; } int main() { int y = 10; func(y); return 0; }

Compiler error

Garbage value

Runtime error

8. Which of the following is correct about virtual functions in C++?

They must be defined in the derived class.

They cannot have a return type.

They support runtime polymorphism.

They cannot be overridden in the derived class.

9. What is the use of the 'std::move' function in C++?

To copy an object

To move an object, enabling transfer of resources

To delete an object

To create a new object

10. Which of the following statements about 'templates' in C++ is true?

Templates allow functions and classes to operate with generic types.

Templates can only be used with classes, not functions.

Templates need to be defined in a separate file.

Templates are executed at runtime

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