9

#include <iostream>
class cObject {
private:
    int id;
    double weight;

public:
    cObject(int id, double w): id { id },
        weight { w } { }

    void print() {
        std::cout << "Object #" << id << " has weight " << weight << "\n";
    }

    cObject operator--() {
        return cObject(id, weight - 1.0);
    }

    cObject operator--(int) {
        cObject o(id, weight);
        weight -= 1.0;
        return o;
    }
};

int main() {
    cObject a(1, 8);
    cObject b(2, 2);

    a.print();
    b.print();

    (a--).print();
    (--b).print();
}