Ace Your C++ Skills 2026 – Rock the ‘Thinking in C++’ Challenge!

A struct in C++ and a class in C++ are both data structures that contain data and functions, but they have some differences. A struct defaults to public access for its members, while a class defaults to private. This means that when using a struct, all of its members are accessible from any part of the code, whereas with a class, its data and functions are not accessible from outside of the class unless explicitly declared as public.

Option A is incorrect because structs in C++ can actually have member functions, just like classes.

Option C is incorrect because structs in C++ can inherit from other structs or classes.

Option D is incorrect because there are actually some differences between structs and classes in C++. One of these differences being the default access level, as mentioned in the correct answer.