What does struct object represents?

#include<iostream>
using namespace std;



struct  A{

   int a;
   int s;
};
int main()
{
    A *S =new A();
    A  obj1=S[0];
    printf(" 0x%x",obj1);
}

My question is when i see the out put it seems be 0x0; and is some cases it becomes 0xFFFFFFFF

can someone explain?