In the given example, class A2 and A3 are derived from the same base class i.e., class A1 (hierarchical inheri-
tance). The classes A2 and A3 both can access variable a1 of class A1. The class A4 is derived from class A2
and class A3 by multiple inheritances. If we try to access the variable a1 of class A1, the compiler shows error
messages as given below.
(a) Error PRG58.CPP 30: Member is ambiguous: ‘A1::a1’ and ‘A1::a1’
(b) Error PRG58.CPP ...
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