Interview Questions

Explain difference between a structure, union and class in C++

Classes vs structures in C++:

Classes and structures in C++ are same except class defaults to private and structures to public.

Both have data members, member function, this pointer, static member functions.

Difference between union, classes and structures in C++:

Union is also similar to classes and structures except:

1. unions cannot be used as base or derived class in inheritance
2. unions cannot have static members
3. defaults to public

Sample program showcasing unions in C++ similarities with classes in C++:

union personalInfo

  int id;
  char name[20];
  void print()



int main()
  union personalInfo me;;
  return 0;