3140 EXAM

Question 1

In OOP, what is a proper noun?

Answer 1

An Object

Question 2

In OOP, what are common nouns?

Answer 2

Classes

Question 3

What can make a common noun represent an object?

Answer 3

Determiner (MY laptop)

Question 4

In OOP, what is an adjective?

Answer 4

Attribute value (implying type)

Question 5

In OOP, what does a plural noun suggest?

Answer 5

A collection of objects

Question 6

In OOP, what three things could represent a collection of objects?

Answer 6

1. A Container class
2. A Table in a database
3. Multiplicity relationship

Question 7

In OOP, what are verbs?

Answer 7

Operations

Question 8

In OOP, what is signified by “is a”

Answer 8

Inheritance

Question 9

In OOP, what is signified by “Has a…Shares a”

Answer 9

Aggregation

Question 10

As you move down a class hierarchy, the objects become _____ specialized?

Answer 10

More

Question 11

How does a class specify which classes it inherits from?

Answer 11

base specification list

Question 12

If the base class access specifier is omitted, what is the default?

Answer 12

Private

Question 13

How many base classes can a derived class specifically initialize?

Answer 13

Only it’s direct base class

Question 14

What 2 keywords can be used with virtual functions in a derived class?

Answer 14

1. virtual
2. override

Question 15

What is a vtable?

Answer 15

Virtual Function Table

Question 16

How do you make a class abstract?

Answer 16

Virtual function = 0

Question 17

If a derived class does not override a virtual function from an abstract base class, what happens?

Answer 17

The derived class becomes abstract as well

Question 18

What is the best practice when making a base class with regards to destructors?

Answer 18

Make a virtual destructor

Question 19

Why should you create a virtual destructor for a base class?

Answer 19

Executing delete on a pointer to a base that points to a derived object has undefined behaviour

Question 20

How does a class inherit from multiple classes that inherit from the same base class?

Answer 20

The classes need to be virtual

Question 21

How do you get the class of an object a pointer is pointing to? (class ClassName)

Answer 21

typeid(*ptr).name()

Question 22

How do you test if a pointer to an object is part of a specific heirarchy?

Answer 22

dynamic_cast< HEIRARCHY* >(ptr.get())

Question 23

What does this return:
dynamic_pointer_cast< HEIRARCHY >(ptr)

Answer 23

A shared pointer to whatever class in the hierarchy you pass it