Deck 6: Structures and Classes

Question 1

A sure test of whether you have succeeded in producing an Abstract Data Type (whether you have truly separated the interface from the implementation)is whether you can use the ADT then change either the implementation or the client code without being required to change the other.

Answer 1

True

Question 2

A structure variable can be defined directly in the same statement that defines a structure definition.

Answer 2

True

Question 3

Consider these hierarchical structures.
struct Date
{
int year;
//members
};
struct Person
{
Date birthDay;
//other members
};
Person Bill;
The year of Bill's birthday may be accessed as Bill.year;

Answer 3

False

Question 4

Multiple public: and private: sections are prohibited in a class.

Question 5

There is no aggregate initialization available for structure variables.You must declare structure variables then use assignment to initialize the members.

Question 6

Structure definitions are usually global (defined outside any functions).

Question 7

A structure member is access using the index operator [ ],with the member name as index.[ ]

Question 8

No special syntax is necessary to define a function that uses a structure parameter.(This is unlike using an array parameter. )

Question 9

There is no access to private members of a class by any function defined outside the class.

Question 10

The following definition of the structure variables of type myStruct s and t could be made using several definitions using the structure tag.
struct myStruct
{
int i;
double d;
} s,t;

Question 11

Consider the class and struct definitions below.
struct myStruct
{
int i;
double d;
};
class myClass
{
int i;
double d;
};
myStruct a;
a.i = 3;
myClass b;
b.i = 3;
True or False: All these statements will compile with no problem.

Question 12

In defining a member function whose declaration is in a class,you use the dot operator to specify that the member function being defined belongs in the class,as
class foo
{
public:
// other members
void output( );
// other members
};
void foo.output( )
{
/* whatever */
}

Question 13

A data type is a collection of a set of values together with a set of basic operations defined on the values.

Question 14

The concept of class is central to Object Oriented Programming.

Question 15

An abstract data type is a collection of a set of values together with a set of basic operations defined on the values.

Question 16

A class type cannot be used in some ways that a built-in type can be used.

Question 17

A structure can have a member whose type is another structure.

Question 18

If,in a class,one uses the keyword public:,it affects only the member that immediately follows the keyword public,making this member accessible to any other function defined anywhere.

Question 19

A class is a type similar to a structure type that normally has member functions as well as member variables.

Question 20

A C++ structure,or struct,like the C++ array,is a homogeneous data structure.(i.e. ,all data is of the same type)

Question 21

What is the reason for separating the interface from the implementation of an ADT?

Question 22

The scope resolution operator can be used with an object to qualify a member function.

Question 23

Here are several different initializations of a structure variable.State what happens in each initialization.
struct WeatherData
{
int temperature;
int windChill;
int windSpeed;
};
a)WeatherData prediction ={ };
b)WeatherData prediction ={40};
c)WeatherData prediction ={40,-10,};
d)x WeatherData prediction ={40,-10,20 };

Question 24

What is the error in the following structure definition?
struct A
{
int b;
int c;
}
int main()
{
A x;
// other code
}

Question 25

In the structure definition
struct StudentRecord
{
int studentID;
char grade;
}
give the structure tag,and each of the member names.

Question 26

C++ allows the programmer to deal with data at a higher level of abstraction in part because related data of differing types can be treated as a unit in

A)a array variable
B)a structure variable
C)a function
D)a library
E)a class variable

Question 27

The dot operator is used between an object and a data member or between a calling object and a call to a member function from the class of the object.

Question 28

Given the ShoeType structure type-definition.Write a function for the declaration (prototype).
struct ShoeType
{
char style;
double price;
};
void setSalePrice(ShoeType& Item,double discountRate);
//discountRate =(discounted price)/(regular price)
//Adjusts sale price to reflect the specified discount.

Question 29

Carefully distinguish between the scope resolution operator,and the dot operator.

Question 30

It seems that mutator and accessor functions defeat the purpose of making the member variables private.Why is this not so?

Question 31

Carefully define mutator and accessor functions of a class.

Question 32

Given the ShoeType structure type definition.Write a function for the declaration (prototype).
struct ShoeType
{
char style;
double price;
};
void readShoeRecord(ShoeType& Item);
// Prompts for data and fills ShoeType argument members

Question 33

What is the output of the following program.?
#include
using namespace std;
struct ShoeType
{
char style;
double price;
};
int main()
{
ShoeType shoe1,shoe2;
shoe1.style = 'P';
shoe1.price = 98.98;
cout << shoe1.style << " $" << shoe1.price << endl;
shoe2 = shoe1;
//Put shoe2 on sale!
shoe2.price = shoe1.price/2;
cout << shoe2.style << " $" << shoe2.price << endl;
}

Question 34

Write a definition for a structure type for personnel records for hourly employees.The record contains an hourly wage rate,accrued vacation in an integer number of days,and employee status (use 'T' for temporary and 'P' for permanent).Part of the problem is appropriate choices of type and member names.

Question 35

Carefully identify,define each term and give differences between the implementation and the interface of an abstract data type (ADT).This requires a bit more writing of English than other question on this test.

Question 36

A member of a structure or of a class is accessed using the

A)Comma operator
B)The dot operator
C)The indexing operator
D)The ampersand operator

Question 37

Given the ShoeType structure type definition,write a function declaration (prototype)for a void function that uses a ShoeType structure variable as a value parameter.
struct ShoeType
{
char style;
double price;
};