What is difference between a structure and class?

Answer 1

in c++ a struct is simply a class with members public by default:

struct app { class app {
int value <=> public: int value;
}; };

Answer 2

Class
it is identifiable entity that share common characteristics & behaviour with object

Structure
collection of data items in desired manner
structure can only have the parameterized constructor.it means a structure can not have non-parameterized constructor default constructor and destructor.