析构

#include <iostream>
using namespace std;


class Area
{
private:
    int *length;
    int *width;
public:
    Area(int a, int b);
    ~Area();
    int area();


};


Area :: Area(int a, int b)
{
    length = new int;
    width = new int;
    *length = a;
    *width = b;


}


Area :: ~Area()
{
    delete length;
    cout<<"length free"<<endl;
    delete width;
    cout<<"width free"<<endl;
}


int Area :: area()
{
    return (*length) * (*width);
}


int main()
{
    Area are(4, 5);
    cout<<are.area()<<endl;
    
    return 0;
}