class and struct in C++

Differences between keywords class and struct in C++:

- In absence of an access-specifier for a base class, public is assumed when the derived class is declared struct and private is assumed when the class is declared class;
- Member of a class defined with the keyword class are private by default. Members of a class defined with the keywords struct or union are public by default;
- Keyword class can be used to declare a template parameter, while struct cannot;
- Keyword struct is compatible with C language, while class is not.