CPP Syntax Fundamentals & Data Structures 3

Question 1

What does 'std::move' do to an object?

Accepted Answer

Casts the object to an rvalue reference, enabling move semantics

Answer

std::move is a cast to rvalue reference; it signals that the object's resources can be transferred rather than copied.

Question 2

Which STL data structure provides LIFO (Last-In, First-Out) behavior?

Accepted Answer

std::stack

Answer

std::stack implements LIFO semantics; elements are pushed and popped from the same end (top).

Question 3

What is the result of this expression in C++?
```cpp
std::cout << (true + true + false);
```

Accepted Answer

2

Answer

In arithmetic context, true converts to 1 and false to 0, so 1+1+0 = 2.

Question 4

What is a 'dangling pointer' in C++?

Accepted Answer

A pointer that points to memory that has been freed or gone out of scope

Answer

A dangling pointer points to memory that is no longer valid, such as after delete or when a local variable's scope ends.

Question 5

Which keyword is used to prevent a derived class from overriding a virtual function in C++11 and later?

Accepted Answer

final

Answer

The 'final' specifier prevents further overriding of a virtual function in derived classes.

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