Explanation:In the above program, the classes A1, A2, and A3 are declared. The mem-
ber variables of all these classes are protected. The class A2 is derived from classA1. The
classA3 is derived from class A2. Thus, the class A2 acts as a derived class as well as
a base class. The function get() reads data through the keyboard, and the function show()
displays data on the screen. Both the functions are invoked using object x of class A3.
11.8 MULTIPLE INHERITANCE
Multiple inheritance ...
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