c++ create, assign and compare a new variable to two object inside an Operator Overloaded function

Question

Apologize for my english. I'm trying to solve a very simple problem in c++. But i'm new in c++ so can't solve this :( I'm trying to use operator overloading with header files. For new I'm trying to implementing this question. But I got error in getStatusPoint method.

int getStatusPoint(Alien const& alien)
{
    return alien.getHeight()*alien.getWeight()*aliean.getGender();
}

bool Alien::operator>(const Alien& alien) const {
    return(getStatusPoint(*this) > getStatusPoint(alien));
}

If I use don't use getStatusPoint method then its working fine. Can anyone please help me to solve this question using getStatusPoint().

Answer 1

Your error message suggests that neither getHeight nor getWeight is marked as const. You should define

class Alien ... {
public:
  int getHeight() const { ... }
  ...
};

Your implementation should neither write access to a field of your class nor call a non-const method of your class.

Answer 2

像int getHeight() const;一样声明您的getHeight() ， getWeight()和getGender() const int getHeight() const;