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 dangling pointer references memory that has been freed or has gone out of scope.

Question 2

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

Accepted Answer

Templates

Answer

Templates let you write generic code that works with any type.

Question 3

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

Accepted Answer

Preserves its value between calls

Answer

A static local variable retains its value across multiple function calls.

Question 4

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

Accepted Answer

std::unique_ptr

Answer

std::unique_ptr enforces sole ownership and cannot be copied.

Question 5

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

Accepted Answer

An int with value 1

Answer

In C, relational expressions evaluate to an int, 1 for true and 0 for false.

Online Coding Lessons Practice Test