Among object-oriented languages, one feature that varies considerably is whether the language allows multiple inheritance. c++ does but ada does not. java takes a middle ground approach of allowing multiple inheritance of interfaces but not classes. using a c++ example, illustrate some of the complexities that multiple inheritance introduces. how does c++ deal with them? why does java's middle ground approach offer some of the benefits of multiple inheritance while avoids its problems.

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?

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