Deck 11: Inheritance and Composition

Question 1

Inheritance is an example of a(n) ____ relationship.

A) is-a
B) has-a
C) handshaking
D) had-a

Answer 1

A

Question 2

A derived class can directly access the protected members of the base class.

Answer 2

True

Question 3

The private members of a base class can be directly accessed by a derived class.

Answer 3

False

Question 4

The constructors of a derived class can (directly) initialize only the (public data) members inherited from the base class of the derived class.

Question 5

Existing classes, from which you create new classes, are called ____ classes.

A) child
B) base
C) sibling
D) derived

Question 6

Which of the following class definitions makes the public members of the class aClass become the public members of the class bClass?

A) class aClass: public bClass
{
//)..
};
B) class bClass: public aClass
{
//)..
};
C) class bClass: aClass
{
//)..
};
D) class aClass: bClass
{
//)..
};

Question 7

The class io is the base class of the C++ stream classes istream and ostream.

Question 8

Which of the following is true about inheritance?

A) All public member functions of the base class become the public member functions of the derived class.
B) All public member variables of the base class become the public member variables of the derived class.
C) All public members of the base class become the public members of the derived class.
D) The public member variables of the base class become the public or private member variables of the derived class.

Question 9

Which of the following is a valid definition of the derived class bClass?

A) class aClass: public bClass
{
//)..
};
B) class bClass: public aClass
{
//)..
};
C) class aClass::bClass
{
//)..
};
D) class bClass::aClass
{
//)..
}

Question 10

____ is a "has-a" relationship.

A) Inheritance
B) Encapsulation
C) Composition
D) Polymorphism

Question 11

In multiple inheritance, the derived class has more than one base class.

Question 12

If inheritance is private, all members of the base class, including private members, become private members of the derived class.

Question 13

A call to the base class's constructor is specified in the heading of the definition of a derived class constructor.

Question 14

In protected inheritance, public and protected members of the base class become the protected members of the derived class.

Question 15

The new classes that we create from existing classes are called ____ classes.

A) sibling
B) base
C) derived
D) parent

Question 16

Classes can create new classes from existing classes. This important feature ____.

A) encourages code reuse
B) aids the separation of data and operations
C) provides public access to the internal state of an object
D) results in more software complexity

Question 17

If the derived class does not override a public member function of the base class, you may specify a call to that public member function by using the name of the function and the appropriate parameter list.

Question 18

Consider the following class definition: The class dClass is derived from the class bClass using the ____ type of inheritance.

A) public
B) private
C) protected
D) static

Question 19

Suppose that bClass is a class. Which of the following statements correctly derives the class dClass from bClass?

A) class dClass:: public bClass
{
//classMembersList
};
B) class dClass: private bClass
{
//classMembersList
};
C) class dClass:: protected bClass
{
//classMembersList
};
D) class bClass: public dClass
{
//classMembersList
};

Question 20

A derived class cannot directly access public members of a base class.

Question 21

The ____ members of an object form its internal state.

A) private
B) protected
C) public
D) static

Question 22

The constructor of a derived class cannot directly access the ____________________ member variables of the base class.

Question 23

In ____________________ (aggregation), one or more members of a class are objects of another class type.

Question 24

If the corresponding functions in the base class and the derived class have the same name but different sets of parameters, then this function is ____ in the derived class.

A) reused
B) redefined
C) overloaded
D) overridden

Question 25

C++ provides ____ functions as a means to implement polymorphism in an inheritance hierarchy, which allows the run-time selection of appropriate member functions.

A) redefined
B) overridden
C) virtual
D) overloaded

Question 26

OOP implements ____.

A) UML
B) IPE
C) EIP
D) OOD

Question 27

Consider the following class definitions: Which of the following correctly sets the values of x and y?

A) void dClass::setXY(int a, int b)
{
BClass::setX(a);
Y = b;
}
B) void dClass::setXY(int a, int b)
{
X = a;
Y = b;
}
C) void dClass::setXY(int a, int b)
{
X = bClass::setX(a);
Y = bClass::setY(b);
}
D) void dClass::setXY(int a, int b)
{
X = bClass.setX(a);
B = y;
}

Question 28

Which of the following is true about a derived class?

A) A derived class can directly access any member variable of the base class.
B) A derived class can redefine any public member function of the base class.
C) A derived class can have at most one base class.
D) A derived class can redefine any member function of the base class.

Question 29

Which of the following statements about inheritance is true if memberAccessSpecifier is protected?

A) The private members of the base class become protected members of the derived class.
B) The derived class can directly access any member of the base class.
C) The public members of the base class become protected members of the derived class.
D) The protected members of the base class become private members of the derived class.

Question 30

The preprocessor directive ____________________ is used to prevent multiple inclusions of a header file in a program.

Question 31

To ____ a public member function of a base class in the derived class, the corresponding function in the derived class must have the same name, number, and types of parameters.

A) redefine
B) overload
C) rename
D) reuse

Question 32

If inheritance is public, all protected members of the base class are ____________________ members of the derived class.

Question 33

Consider the following class definitions: Which of the following statements correctly redefines the member function print of bClass?

A) void dClass::print() const
{
DClass:print();
Cout << " " << y << endl;
}
B) void dClass::print() const
{
Cout << x << " " << y << endl;
}
C) void bClass::print() const
{
Cout << x << " " << y << endl;
}
D) void dClass::print() const
{
BClass::print();
Cout << "y = " << y << endl;
}

Question 34

Consider the following class definitions: Which of the following dClass constructor definitions is valid in C++?

A) dClass::dClass(double a, double b, double c)
: bClass()
{
X = a;
Y = b;
Z = c;
}
B) dClass::dClass(double a, double c)
{
X = a;
Z = c;
}
C) dClass::dClass(double a, double b)
: bClass()
{
X = a;
Y = b;
}
D) dClass::dClass(double a, double b, double c)
: bClass(a, b)
{
Z = c;
}

Question 35

If the derived class classD overrides a public member function functionName of the base class classB, then to specify a call to that public member function of the base class, you use the statement ____.

A) classD::functionName();
B) classB::functionName();
C) classD.functionName();
D) classB.functionName();

Question 36

____ is the ability to combine data, and operations on that data, in a single unit.

A) Inheritance
B) Encapsulation
C) Polymorphism
D) Composition

Question 37

In OOD, a program is a collection of interacting ____________________; in structured programming, a program is a collection of interacting functions.

Question 38

____ is the ability to use the same expression to denote different operations.

A) Inheritance
B) Encapsulation
C) Polymorphism
D) Composition

Question 39

The ____ members of an object form its external state.

A) private
B) public
C) protected
D) static

Question 40

What is the output of the following program?

A) 2 3
2 3
B) 2 3
3 5 8
C) 3 5 8
3 5 8
D) 5 8
3 5 8

Question 41

C++ provides ____________________ functions as a means to implement polymorphism in an inheritance hierarchy.