See the code below:

```
#include <vector>
#include <iostream>
int main(int argc, char *argv[]) {
  std::vector<double> obj(10,0);
  std::cout << &obj << std::endl;
  std::cout << &obj[0] << std::endl;
}

```

I want to know the difference between these two addresses & thanks!
As I know, for a array like `a[5]`, `&a` <=> `&a[0]` <=> `a`.