【求助】为什么析构两次不报错？？

//cat类
#include <iostream>
using namespace std;
class cat
{private:
    static int howmanycat;
public:
    cat(){cout<<"构造\n";howmanycat++;}
    static void gethowmanycat(){cout<<howmanycat<<endl;}
    ~cat(){cout<<"析构\n";--howmanycat;}
};
int cat::howmanycat=0;
void main()
{
    int n;
    cout<<"n=";
    cin>>n;
    cat *p;
    p=new cat[n];
    for(int i=0;i<n;i++)
    {
        (p+i)->gethowmanycat();
         (p+i)->~cat();
    }
    delete [] p;
}