Although you start to define a value for b.

But after b =&; a； B has been reassigned.

At this time, what is stored in B is not the value of A, but the value of A, which is the address of the memory where 1 is located, EF0 1.

Similarly, y is the address value of the stored value of b (EF0 1).

Y points to B, and finally Y outputs the value of B, which is the address value of A..