Question

Whenever I try to compile my program, I get a strange error. I have tried to look it up, and trying different methods of overloading it, but I still get errors.

istream& operator >> ( istream& in, MysteryCard& theMysteryCard ) 
{
  int value;
  in >> value;
theMysteryCard.change(value);
  return in;
}

---

All of my variables are right, and the functions work, but I do not know why it isn’t working.

13 no match for 'operator>>' in 'in >> value'

The change function is public as well.

Answer 1

It appears to me that you’re missing an include. Make sure you have #include <istream> and that you have either a using declaration for std::istream or a using directive for namespace std.