Explanation: In the above program, classA has two private integer member variables x and y.
The classB has a one-integer variable z, and it is derived from classA. In function main(),
b is an object of classB, and p is a pointer. The pointer p is initialized with the address of
public member variable z. The memory location of p is initialized with 3 (initialization
of z). By applying a decrease operation on pointers, previous locations are accessed, and ini-
tializations of memory locations are done (initialization of y and x). The address of x is passed
to function show(). By applying an increase operation with the pointer address, ...
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