Deck 10: Defining Classes

Question 1

When several items variables or variables and functions) are grouped together into a single package, that is known as ______________.

Answer 1

data) encapsulation

Question 2

A member function that allows the user of the class to find out the value of a private data type is called a ___________________.

Answer 2

accessor function.

Question 3

A structure can only be passed to a function as a call-by-value parameter

Answer 3

False

Question 4

A structure definition ends with the closing brace and a _________.

Question 5

A derived class is more specific than its parent, or base class.

Question 6

All constructors for a class must be private.

Question 7

A function may return a structure.

Question 8

A member function that allows the user of the class to change the value of a private data type is called a ____________________.

Question 9

Different class may not have member functions with the same name.

Question 10

The assignment operator may not be used with objects of a class.

Question 11

A structure variable is a collection of smaller values called ____________ values

Question 12

Who can access private members in a class?

Question 13

Two different structure definitions may have the same member names.

Question 14

A struct variable is declared differently from a predefined type such as an int.

Question 15

The double colon ::) is known as the __________ operator.

Question 16

It is possible to have multiple private labels in a class definition.

Question 17

The keyword ________ defines a structure type definition.

Question 18

When a structure contains another structure variable as one of its members, it is known as a ___________________.

Question 19

A class member function may be private.

Question 20

Class data members are almost always public.

Question 21

In the following class constructor definition, the part of the header starting with a single colon is called the ________________.
BankAccount::BankAccount): balance0), interest0.0)

Question 22

What is wrong with the following structure definition?
Struct MyStruct
{
Int size;
Float weight;
}

A) Nothing
B) Can not have mixed data types in a structure
C) missing semicolon
D) Braces are not needed.

Question 23

If you have a class with a member function called displayostream& out), that will send the values in the class to the parameter stream, and you need to call that function from within another member function, how would you call it to print the data to the screen? ___________________________

Question 24

A member function of a class should be made private

A) always
B) only if it will never be used
C) if it will only be used by other members of the class
D) never, it is illegal to make a member function private.

Question 25

A class in which modifications to the implementation appear to be invisible to the user of the class is known as _________________.

Question 26

A member function that gets called automatically when an object of the class is declared is called a _______________.

Question 27

In a structure definition, the identifiers declared in the braces are called

A) classes
B) structs
C) member names
D) variables

Question 28

Given the following strucure definitions, what is the correct way to print the person's birth year?
Struct DateType
{
Int day;
Int month;
Int year;
}
Struct PersonType
{
Int age;
Float weight;
DateType birthday;
}
PersonType person;

A) cout << person.birthday.year;
B) cout << year;
C) cout << birthday.year;
D) cout << peson.year;

Question 29

C++11 allows you to have a constructor call another constructor. This feature is called _________________________.

Question 30

When defining a class, the class should be composed of the kind of values a variable of the class can contain, and

A) member functions for that class
B) the keyword private
C) other class definitions
D) nothing else

Question 31

Given the following strucure definition, what is the correct way to initialize a variable called today?
Struct DateType
{
Int day;
Int month;
Int year;
}

A) DateType today1,1,2000);
B) DateType today = 1,1,2000);
C) DateType today = {1,1,2000);
D) DateType today = {1,1,2000,0);

Question 32

The name of a constructor is _____________

Question 33

Which of the following is the correct function definition header for the getAge function which is a member of the Person class?

A) int getAge);
B) int getAge)
C) int Person:getAge)
D) int Person::getAge)

Question 34

Given the following class definition and the following member function header, which is the correct way to output the private data?
Class Person
{
Public:
Void outputPersonostream& out);
Private:
Int age;
Float weight;
Int id;
};
Void Person::outputPersonostream& out)
{
//what goes here?
}

A) out << person.age << person.weight << person.id;
B) out << person;
C) out << age << weight << id;
D) outputPersonperson);

Question 35

You specify an individual member of a struct by using

A) the assignment operator
B) an ampersand
C) an underscore
D) The dot operator

Question 36

If class A is derived from class B, then B is a _______ of A.

Question 37

C++11 allows you to directly set the member variables to initial values in the definition of the class. This feature is called __________________.

Question 38

To assign values to a structure variable, you use the

A) equals operator
B) assignment operator
C) extraction operator
D) less than operator

Question 39

The constructor of a class that does not have any parameters is called a __________ constructor.

Question 40

What can a constructor return? _______________

Question 41

A Member function that allows the user of the class to see the value in a data member is known as

A) a mutator function
B) a mutation
C) a manipulator function
D) an accessor function

Question 42

Data members or member functions of a class that are declared to be private may

A) only be accessed by the main program
B) only be accessed by members of the class
C) not be accessed by the class
D) are considered to be global variables

Question 43

Member functions of a class

A) may not be in the private section
B) must be in the private section
C) may be in either section
D) can not be called in the main program

Question 44

In a class, all members are ____________ by default

A) public
B) private
C) global
D) all of the above

Question 45

In a struct, all members are ____________ by default

A) public
B) private
C) global
D) all of the above

Question 46

Which part of the ADT tells the programmer using it how to use it?

A) the implementation
B) the interface
C) the abstractness
D) the scope resolution

Question 47

Given the following class definition, what is missing?
Class ItemClass
{
Public:
ItemClassint newSize, float newCost);
Int getSize);
Float getCost);
Void setSizeint newSize);
Void setCostfloat newCost);
Private:
Int size;
Float cost;
};

A) nothing
B) a default constructor
C) accessor functions
D) mutator functions

Question 48

Given the following class, what would be the best declaration for a constructor that would allow the user to initialize the object with an initial age and cost?
Class Wine
{
Public:
Wine);
Int getAge);
Float getCost);
Private:
Int age;
Float cost;
}

A) int getAgeint newAge);
B) Wine);
C) Wineint age);
D) Wineint newAge, float newCost);

Question 49

Given the following class and object declaration, how would you print out the age and cost of a bottle of wine?
Class Wine
{
Public:
Wine);
Int getAge);
Float getCost);
Private:
Int age;
Float cost;
}
Wine bottle;

A) cout << bottle;
B) cout << Wine.age, Wine.cost;
C) cout << bottle.getAge) << bottle.getCost);
D) cout << bottle.getAge << bottle.getCost;
E) cout << bottle.age << bottle.cost;

Question 50

A derived class has access to

A) the private functions and variables of its ancestor classes
B) the public functions and variables of its ancestor classes
C) only the functions and variables defined it its class
D) none of the above

Question 51

If you design a class with private data members, and do not provide mutators and accessors, then

A) The private data members can still be accessed from outside the class by using the & operator
B) The data can not be changed or viewed by anyone.
C) None of the above
D) A and B

Question 52

If you are designing a class for an ADT, you can tell if the class is an ADT if

A) when you change the implementation of the class, none of the rest of the program needs to change.
B) when you change the interface of the class, nothing else needs to change.
C) you change the privte part and the rest of the program using the ADT does not compile.
D) everything must be changed.

Question 53

A class member function that automatically initializes the data members of a class is called

A) the init function
B) an operator
C) a constructor
D) a cast

Question 54

Given the following class, what would be the best declaration for a mutator function that allows the user of the class to change the age?
Class Wine
{
Public:
Wine);
Int getAge);
Float getCost);
Private:
Int age;
Float cost;
}

A) int getAgeint newAge);
B) Wine);
C) void setAge);
D) void setAgeint newAge);

Question 55

If you have a class named myPersonClass, which of the following correctly declare a constructor in the class definition?

A) myPersonClass::myPersonClass);
B) myPersonClass);
C) init);
D) cast);

Question 56

Given the following class definition, how would you declare an object of the class, so that the object automatically called the default constructor?
Class ItemClass
{
Public:
ItemClass);
ItemClassint newSize, float newCost);
Int getSize);
Float getCost);
Void setSizeint newSize);
Void setCostfloat newCost);
Private:
Int size;
Float cost;
};

A) ItemClass) myItem;
B) ItemClass myItem1, 0.0);
C) ItemClass myItem;
D) ItemClass myItem);
E) You can not do this

Question 57

A data type consisting of data members and operations on those members which can be used by a programmer without knowing the implementation details of the data type is called

A) an abstract definition type
B) an available data type
C) an abstract data type
D) a primitive data type

Question 58

given the following class definition, how could you use the constructor to assign values to an object of this class?
Class CDAccount
{
Public:
CDAccount);
CDAccountfloat interest, float newBalance);
Float getBalance);
Float getRate);
Void setRatefloat interest);
Void setBalancefloat newBalance);
Private:
Float balance, rate;
};
And the following object declaration
CDAccount myAccount;

A) myAccount = CDAccountfloat myRate, float myBalance);
B) myAccount = CDAccount {myRate, myBalance};
C) myAccount = CDAccount[myRate, myBalance];
D) myAccount = CDAccountmyRate, myBalance);

Question 59

Developing an ADT means that the user of your class does not have to know the details about how the class is implemented. This is known as

A) interface
B) implementation
C) testing and debugging
D) information hiding

Question 60

A member function that allow the user of the class to change the value in a data member is known as

A) a mutator function
B) a mutation
C) a manipulator function
D) an accessor function

Question 61

Which of the following function declarations will accept either cout or a file stream object as its argument?

A) void output fstream &outFile);
B) void output ofstream &outFile);
C) void output ostream &outFile);
D) void output iostream &outFile);