Write a C++ program that declares int variables x, y, z and int* pointer variables p, q, r. Set x, y, z to three different values. Set p, q, r to the addresses of x, y, z respectively.

1. Print with labels the values of x, y, z, p, q, r, *p, *q, *r.
2. Print the message: Swapping pointers.
3. Execute the swap code: r = p; p = q; q = r;