0 Structures vs Classes in C++

C++ programming language provides structures (using keyword struct) and classes (using keyword class) to create user-defined data types. Instances of these data types are known as objects.
C++ structures and  C++ classes are exactly same except default access specifier of their members. In C++ struct all members are public by default while in class all are private by default.

Example:-
class A{
                int i;   //private by default
                public:
                  int j; 

            };

struct B{
              int i;  //public by default;
              private:
                int j;
            };