Online Coding Lessons C and C++ Coding 3

Question 1

What is a dangling pointer in C?

Accepted Answer

A pointer to freed or out-of-scope memory

Answer

A pointer set to NULL

Answer

A pointer to a constant

Answer

A pointer to an array

Question 2

In C++, which feature allows a function to operate on multiple types using a single definition?

Accepted Answer

Templates

Answer

Inheritance

Answer

Namespaces

Answer

Overloading

Question 3

What does the 'static' keyword do for a local variable inside a C function?

Accepted Answer

Preserves its value between calls

Answer

Makes it global

Answer

Allocates it on the heap

Answer

Makes it constant

Question 4

Which C++ smart pointer ensures exclusive ownership of a resource?

Accepted Answer

std::unique_ptr

Answer

std::shared_ptr

Answer

std::weak_ptr

Answer

std::auto_ptr

Question 5

What is the output type of the C comparison expression (5 > 3)?

Accepted Answer

An int with value 1

Answer

A boolean true

Answer

A char

Answer

A float

Question 6

In C++, what is the purpose of a destructor?

Accepted Answer

Clean up resources when an object is destroyed

Answer

Initialize members

Answer

Copy an object

Answer

Compare two objects

Question 7

What does the preprocessor directive #include do in C?

Accepted Answer

Inserts the contents of another file

Answer

Compiles a file

Answer

Defines a macro

Answer

Links a library at runtime