What is the Difference Between class and struct?

The keywords class and struct both declare a so-called class type. The declared class will have different properties, such as default member access, depending on whether class or struct was used.

class

?inline

members private by default
private inheritance from base class by default
incompatible with C
typically used for larger classes

struct

?inline

members public by default
public inheritance from base class by default
compatible with C
typically used for aggregates, traits