编辑代码

#include <iostream>
using namespace std;
class Fruit
{
    protected:
        int weight;
    public: 
        Fruit(int a)
        {
            cout << "Fruit Constructor" <<endl;
            weight = a;
        }
        virtual ~Fruit()
        {
            cout << "Fruit Destructor" <<endl;
        }
        virtual void display()
        {    
            cout << "weight=" << weight <<endl;
        }
};
 
class Banana :public Fruit
{
    private:
        string origin="";
    public:
        Banana(string a,int b):origin(a),Fruit(b)
        {
            cout << "Banana Constructor" <<endl;
        };
        ~Banana()
        {
            cout << "Banana Destructor" <<endl;
        }
        void display()
        {    
            cout << "origin=" << origin <<",weight="<<weight<<endl;
        }
};
int main() {
    Fruit *pf=new Banana("Chongqing",10);
    pf->display();
    delete pf;
	return 0;
}