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27. Suppose the unary ! operator is an overloaded member function of class String. For a String object s, which function call is generated by the compiler when it finds the expression Is? a. s.operator!0 b. s.operator!(default valuel, default value?,...) c. operator!(s d. A compiler error results because no arguments are given 28. Select the false statement regarding inheritance. a. A derived class can contain more attributes and behaviors than its base class b. A derived class can be the base class for other derived classes c. Some derived classes can have multiple base classes. d. Base classes are usually more specific than derived classes 29. The is-a relationship represents. a. Composition. b. Inheritance. c. Information Hiding. d. A friend. ao. which of the following is most likely a base class of the other three? b, convertible. c. miniVan. d. sedan. 31. Which of the following is not a good example of a hierarchy likely to be inheritance? a. Airplanes. b. Geometric shapes. c. Animals. d. Prime numbers. 32. To declare class subClass a privately derived class of superClassone would writer would write: a. class subclass : private superClass b. class subclass :: private superClass c. class subclass <private superClass> d. class subclass inherits private superClass 33. Assuming the definition, class BasePlusCommissionEmployee: public CommissionEmployee which of the following is false? a. The colon (:) in the header of the class definition indicates inheritance. b. The keyword public indicates the type of inheritance. c. All the public and protected members of class BasePlusCommissionEmployee are inherited as public and protected members, respectively, into class CommissionEimployee. d. CommissionEmployee is the base class and BasePlusCommissionEmployee is the derived class.
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Answer #1

28. d) Base classes are usually more specific than derived class.

Explanation: Base classes are always supposed to be generic and derived class to be more specific.

29. b) inheritance

Explanation:

In object-oriented programming, the concept of IS-A is a totally based on Inheritance, which can be of two types Class Inheritance or Interface Inheritance. It is just like saying "A is a B type of thing". For example, Apple is a Fruit, Car is a Vehicle etc. Inheritance is uni-directional. For example, House is a Building. But Building is not a House.

It is a key point to note that you can easily identify the IS-A relationship. Wherever you see an extends keyword or implements keyword in a class declaration, then this class is said to have IS-A relationship.

30. a) automobile

Explanation: Automobile is the most generic class among all others, hence, it should be the base class.

31. d) prime numbers

Explanation: Prime numbers do not exhibit any hierarchial relationship.

NOTE: As per HOMEWORKLIB POLICY, I am allowed to answer only 4 questions (including sub-parts) on a single post. Kindly post the remaining questions separately and I will try to answer them. Sorry for the inconvenience caused.

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