what is pointer past the end of an object means?

Question

In C++ Primer, Chapter 2, \"Variables and Basic Types\", it says:

it is possible for a pointer to an object and a pointer one past the end of a different

Answer 1

"one past" means "+1 operation on the pointer". The following code generates:

0x7ffffcf6a848
0x7ffffcf6a84c
0x7ffffcf6a84c

As you can see, the address of "one past a", i.e., &a + 1 is the same as &b.

    int a = 2; 
    int b = 3;
    cout<< &a << endl << &a + 1 << endl << &b <