Deck 8: Advanced Collections

Question 1

The GetLength( )method can be called to return the number of rows or columns.

Answer 1

True

Question 2

The string is a reference type in C#.

Answer 2

True

Question 3

Console.WriteLine(calories.GetUpperBound(0));returns the largest value in an array.

Answer 3

False

Question 4

In C#,a two-dimensional array is usually visualized as a table divided into columns and rows where data is stored in contiguous memory locations by column.

Question 5

In C#,you may access a two-dimensional array element using the notation [ ,] or through using a double set of braces ([ ] [ ]).

Question 6

Multi-dimensional array identifiers are normally defined using a plural noun.

Question 7

double [ , ] price = new double [2 , 5] {{1.1, 1.2, 1.3, 1.5, 1.4}{2.1, 2.2, 2.3, 2.5, 2.4}};
With the declaration above,price[1] refers to 1.2.

Question 8

With C#,you are limited to 10 dimensions for multi-dimensional arrays.

Question 9

Collection classes are classes that enable you to store and retrieve various groups of objects.

Question 10

double [ , ] price = new double [2 , 5] {{1.1, 1.2, 1.3, 1.5, 1.4}{2.1, 2.2, 2.3, 2.5, 2.4}};
Looking above,the value of price.Length is 10.

Question 11

For a declaration such as,int [ ,] anArray = new int [6,5],a total of 11 memory locations can be accessed using the identifier anArray.

Question 12

The string class stores an immutable series of characters--meaning once you assign a string reference a value,that referenced location's value cannot be modified.

Question 13

C# uses a row major format for accessing arrays,which means that the elements are printed in rows.Every entry in the first column is printed before moving to the second column.

Question 14

With a two dimensional array,when the number of columns in the rows differs,a jagged array can be created.

Question 15

The Length property can be used to return the total number of elements in all dimensions.

Question 16

double [ , ] price = new double [2 , 5] {{1.1, 1.2, 1.3, 1.5, 1.4}{2.1, 2.2, 2.3, 2.5, 2.4}};
With the declaration above,price[0,2] refers to 2.2.

Question 17

The major requirement of dealing with multi-dimensional arrays is the fact that all data values placed in an array must be of the same base type.

Question 18

The Rank property is used with array collections to return the number of dimensions.

Question 19

The Queue class represents a Last In First Out (LIFO)collection of objects while the
Stack collection class represents a simple FIFO (First In First Out)collection.

Question 20

The foreach loop structure cannot be used to iterate through a multi-dimensional array.

Question 21

Normally you will want to use two integral values to reference individual elements in a two-dimensional array.If you use just one integral value,you get all of the values for that row.

Question 22

With a two-dimensional array,GetLength(0)returns the number of rows and GetLength(1)returns the number of columns in the array.

Question 23

int [ , ] score = {{88, 66, 76, 92, 95} {67, 88, 45, 99, 80}};
int total = 0;
foreach (int val in score)
total += val;
Using the code shown above,what is added to total during the first iteration?

A) 0
B) 88
C) 86, 66, 76, 92 and 95
D) unknown, because val is not initialized

Question 24

One of the properties of the ArrayList class is ____. It Gets or sets the number of elements that the ArrayList can contain.

A) Length
B) Capacity
C) Rank
D) Count

Question 25

int [ , ] score = {{88, 66, 76, 92, 95} {67, 88, 45, 99, 80}};
int total = 0;
foreach (int val in score)
total += val;
Which of the following is a valid example of calling a method and sending it a two-dimensional array argument?

A) DisplayArrayContents(int [ , ] anArray);
B) DisplayArrayContents(anArray);
C) DisplayArrayContents(anArray[10, 2]);
D) DisplayArrayContents(int [10, 2] anArray);

Question 26

A two dimensional array is accessed much like you access cells in a spreadsheet.

Question 27

If an array named num is dimensioned to hold 10 values in 5 rows and 2 columns,how would you store 50 in the first physical row and first physical column?

A) num[ 1, 1 ] = 50;
B) num[ 0 , 0 ] = 50;
C) num = 50 [ ] ;
D) num5 = 50;

Question 28

int [ , ] score = {{88, 66, 76, 92, 95} {67, 88, 45, 99, 80}};
int total = 0;
foreach (int val in score)
total += val;
Which of the following is a valid heading for a method that could accept the two-dimensional array as an argument?

A) void DisplayOutput(double [ , ] anArray)
B) void DisplayOutput(double [10 , 2 ] anArray)
C) void DisplayOutput(double anArray)
D) void DisplayOutput(double anArray [10 , 2])

Question 29

A Hashtable represents a collection of key/value pairs that are organized based on the hash code of the key.

Question 30

One of the special properties in the ArrayList class is Count.It returns ____.

A) an int representing the number of values currently stored in the array
B) an int representing the size the array was dimensioned
C) how much storage is consumed by the entire array
D) the length of an individual element of the array

Question 31

int [ , ] score = {{88, 66, 76, 92, 95} {67, 88, 45, 99, 80}};
int total = 0;
foreach (int val in score)
total += val;
BinarySearch( )is ____.

A) a method in the ArrayList class
B) an instance method
C) usable with floating point type arrays
D) a method in the string class

Question 32

The ArrayList class requires you to add and remove elements to/from the structure using Push( )and Pop( )methods.

Question 33

The ArrayList class can be used to create a listlike structure that can dynamically increase or decrease in length.

Question 34

C# has two types of string literals.Quoted string literals appear between double quotation marks (" ") and verbatim string literal,which start with the at symbol (@).

Question 35

There are several ways to do a compile-time initialization of two-dimensional arrays.All of the following are valid ways EXCEPT ____.

A) int [, ] anArray = {{100, 100, 100} {100, 100, 100}};
B) int [ , ] anArray = new int [ , ] {{100, 100, 100} {100, 100, 100}};
C) int [ , ] anArray = new int [2, 3 ] {{100, 100, 100} {100, 100, 100}};
D) int [ ] anArray = new int [10 ] {{100, 100, 100} {100, 100, 100}};

Question 36

The ArrayList does not allow you to mix types.All elements must be of the same data type.

Question 37

The string type allows individual characters to be accessed using an index with [ ].

Question 38

Which of the following would define a two dimensional structure to store temperature during three periods of a day for seven days?

A) int [ , ] temp = new int [7, 3];
B) int [ , ] temp = new int [6, 2];
C) int temp[7] [3 ] = new temp [7] [3];
D) int temp[6] [2 ] = new temp [6] [2];

Question 39

Since the string data type is a reference type,you compare addresses as opposed to comparing contents or values when you use the equality operators with two string data items.

Question 40

int [ , ] score = {{88, 66, 76, 92, 95} {67, 88, 45, 99, 80}};
int total = 0;
foreach (int val in score)
total += val;
Which of the following could be a method heading for a member method that returns a two-dimensional array?

A) int [ , ] void DoSomething( )
B) void int [ , ] DoSomething( )
C) int [ , ] DoSomething( )
D) void DoSomething[ , ]

Question 41

int[ ] [ ] anArray = new int[2] [ ];
anArray[0] = new int[ ] {100, 200};
anArray[1] = new int[ ] {11, 22, 37};
The above segment of code ____.

A) creates a jagged array
B) creates a syntax error
C) creates a 2 x 3 array
D) declares a three-dimensional array

Question 42

Which of the following is an example of a collection class?

A) Array
B) Queue
C) HashTable
D) all of the above

Question 43

string sValue = "Life is about choices";
string [ ] sn = sValue.Split(' ');
Using the Substring( )method with sValue,which of the following references the word choices?

A) sValue.Substring(14, 7);
B) sValue.Substring(3);
C) sValue.Substring("choices");
D) sValue.Substring(15, 7);

Question 44

____ are types of data structures that consist of a sequence of data records such that in each record there is an additional field that contains a reference (i.e.,a link)to the next record in the sequence.

A) Arrays
B) ArrayLists
C) Linked lists
D) Strings

Question 45

The ____ method adds an object to the end of the queue.

A) Enqueue( )
B) Dequeue( )
C) Pop( )
D) Push( )

Question 46

Console.Write("AnExample".PadLeft(20,"#")returns ____.

A) ###########AnExample
B) AnExample###########
C) AnExample
D) AnExample

Question 47

int [ ,,] anArray = new [3,2,7] allows ____ elements to be stored.

A) 42
B) 12
C) 7
D) 3

Question 48

string [ , ] name = new string [2, 3] {{"Alex", "Ben", "Cay"}, {"Jose", "Tyne", "Yin" }};
Which of the following segments of code will display the first row of a two dimensional array?

A) for (int i = 0; i < anArray.GetLength(1); i++)
Console.Write(anArray[0, i] + "\t");
B) for (int i = 0; i < anArray.GetLength(0); i++)
Console.Write(anArray[0, i] + "\t");
C) for (int i = 0; i < anArray.GetLength(0); i++)
Console.Write(anArray[i, 0] + "\t");
D) for (int i = 0; i < anArray.GetLength(1); i++)
Console.Write(anArray[i, 0] + "\t");

Question 49

Console.Write("anExample".IndexOf("a"));returns ____.

A) null
B) 4
C) 04
D) 0

Question 50

string sValue = "Life is about choices";
string [ ] sn = sValue.Split(' ');
Which method in the string class might be useful to create a table with values number aligned?

A) Align( )
B) Concat( )
C) PadLeft( )
D) Split( )

Question 51

Which class represents a First-In-First-Out (FIFO)collection,which is useful for storing objects in the order they were received for sequential processing?

A) Queue
B) HashTable
C) Stack
D) ArrayList

Question 52

The method ____ of the ArrayList class returns an arraylist that is a subset of another arraylist.

A) GetSubList( )
B) InsertRange( )
C) SubList( )
D) GetRange( )

Question 53

string sValue = "Life is about choices";
string [ ] sn = sValue.Split(' ');
The method in the string class that returns the string in uppercase is ____.

A) StringUpper( )
B) Upper( )
C) ConvertToUpper( )
D) ToUpper( )

Question 54

string sValue = "Life is about choices";
string [ ] sn = sValue.Split(' ');
After the above segment of code is executed,where is "choices" stored?

A) sn[0]
B) sn[4]
C) sn[3]
D) sValue

Question 55

The method that deletes a number of characters beginning at a specified position is ____.

A) Remove( )
B) Delete( )
C) Replace( )
D) ReplaceAt( )

Question 56

string [ , ] name = new string [2, 3] {{"Alex", "Ben", "Cay"}, {"Jose", "Tyne", "Yin" }};
Looking above,what does name[0,1] reference?

A) l
B) Ben
C) Alex
D) Al

Question 57

The string method that retrieves part of a string from a string argument is ____.

A) Trim( )
B) Substring( )
C) Retrieve( )
D) IndexOf( )

Question 58

In order to determine the position of one or more characters inside a string argument,use the ____ method of the string class.

A) Location( )
B) Position ( )
C) IndexOf( )
D) Place( )

Question 59

string [ , ] name = new string [2, 3] {{"Alex", "Ben", "Cay"}, {"Jose", "Tyne", "Yin" }};
Which of the following returns the number of columns in a two-dimensional array?

A) Rank
B) GetLength(0)
C) GetLength(1)
D) GetLength

Question 60

C# has two types of string literals.The @-quoted string literals are called ____.

A) quoted string literal
B) at string literal
C) actual string literal
D) verbatim string literal

Question 61

If you override the GetHashCode( )method,you must also override the ____________ method to guarantee that two objects considered equal have the same hash code.Both are inherited from the object class.

Question 62

C# is a row major language,which means you specify the column index ____________ when you reference elements in a two-dimensional array.

Question 63

int[ ] [ ] anArray = new int[2] [ ];
anArray[0] = new int[ ] {100, 200};
anArray[1] = new int[ ] {11, 22, 37};
The ____________ property can be used with multidimensional arrays to get the total number of elements in all dimensions.

Question 64

Strings are considered ____________ because once you give a string a value;it cannot be
modified.Methods that seem to be modifying a string are actually returning a new
string containing the modification.

Question 65

int[ ] [ ] anArray = new int[2] [ ];
anArray[0] = new int[ ] {100, 200};
anArray[1] = new int[ ] {11, 22, 37};
For a two-dimensional array,values are stored ____________ using a row major format.

Question 66

____________ class represents a simple last-in-first-out (LIFO)collection of objects.

Question 67

The ____________ method is used with the ArrayList class to push items on the list.

Question 68

int[ ] [ ] anArray = new int[2] [ ];
anArray[0] = new int[ ] {100, 200};
anArray[1] = new int[ ] {11, 22, 37};
The property ____________ returns the number of dimensions of the array.

Question 69

To declare a three-dimensional array,three integral values are used.The first number specifies the number of ____________.

Question 70

The major requirement when working with arrays is the fact that all data values placed in an array must be of the ____________.

Question 71

As with the ArrayList class,in order to instantiate objects of many of the collection classes,you need to include a using ____________.

Question 72

The ____________ are defined to compare the contents of strings instead of comparing their addresses.

Question 73

Like traditional arrays,indexes of ArrayList objects are ____________.

Question 74

C# also includes a generic ____________ class that is very similar to the ArrayList class.The primary difference between the two classes is that objects do not have to be the same type when they are pushed on an ArrayList,unlike the other class,which requires all objects to be of the same type..

Question 75

In C#,the string type allows individual characters to be accessed using a(n)____________ with the [ ].