Is there a difference where to put const for a method in c++?

Question

C++ / C#

Is there any difference between these two code options:

const int get_NOD() {
    return NOD;
  }

and this

int get_NOD() const{
    return NOD;
  }

Answer 1

There is a difference, and a big one:

const int get_NOD() {
    return NOD;
}

-- returns const int and may change *this

int get_NOD() const{
    return NOD;
}

-- returns an int and cannot change *this.
There is no difference between

const int get_NOD() {
    return NOD;
}

and

int const get_NOD() {
    return NOD;
}