Deck 7: Arrays

Question 1

For an array that is dimensioned with a Length of 100,valid subscripts are 0 through 100.

Answer 1

False

Question 2

When an array is sent to a method as an argument,if the method changes one or more of the elements,the changes are made to the actual data.

Answer 2

True

Question 3

To declare an array,the value(s)used inside the square bracket can be a constant literal,a variable,or an expression that produces an integral value.

Answer 3

True

Question 4

A parallel array is used to create string arrays because multiple characters are included within each element.

Question 5

Arrays can be used as fields or instance variables in classes;and,arrays of objects can be declared.

Question 6

If you use the params parameter type,params must appear both in the formal parameter list of the method heading and in the actual argument list.

Question 7

In C# the length of an array cannot be changed.After it is instantiated with a length,dynamic resizing is not an option.

Question 8

The type used in the foreach expression must match the array type.

Question 9

double [ ] price = new double [ ] {3, 2.2, 4.7, 6.1, 4};
With the declaration above,price[5] generates a runtime error.

Question 10

double [ ] price = new double [ ] {3, 2.2, 4.7, 6.1, 4};
With the declaration above,price[2] refers to 2.2.

Question 11

Because arrays are reference types,the ref keyword is required with the argument and parameter list.

Question 12

Arrays are reference variables.

Question 13

When a method uses the params modifier,it indicates that the number of arguments to the method may vary.

Question 14

Arrays can be sent to methods as arguments,and methods can have arrays as their return type.

Question 15

Properties are added to a class to enable client applications to access public members.

Question 16

Array identifiers are normally defined using a plural noun.

Question 17

The Clear( )method of the Array class sets all integer elements to zero.

Question 18

double [ ] price = new double [ ] {3, 2.2, 4.7, 6.1, 4};
Looking above,the value of price.Length is 5.

Question 19

You can declare an array without dimensioning its size,but the size must be determined before you can access it.

Question 20

When you pass an array to a method,by default,a copy of each element in the array is made and passed to the method.

Question 21

With parallel arrays,the relationship is established through using the same subscript or index to refer to the elements in both arrays.

Question 22

All arrays are objects of the base type ____ class.

A) Object
B) Base
C) Super
D) Array

Question 23

The index is also referred to as the ____ of the array.

A) value
B) element
C) size
D) subscript

Question 24

int [ ] anArray = new int[24];
Array elements are normally stored in contiguous,side-by-side,memory locations with the first index in all arrays being referenced by index 0.

Question 25

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

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

Question 26

int [ ] anArray = new int[24];
For the above declaration,25 cells are set aside for the array since the first element is referenced by index 0.

Question 27

All arrays are objects of the base type Array class.

Question 28

If an array named num is dimensioned to hold 10 values,how would you store 50 in the 5th physical location?

A) num[5] = 50;
B) num[4] = 50;
C) num = 50 [5] ;
D) num5 = 50;

Question 29

When you pass a single array element such as an integer,you are passing by reference.

Question 30

int [ ] anArray = new int[24];
You can instantiate arrays of user-defined array objects and send in arrays as arguments to methods,but you cannot return arrays from methods.

Question 31

You create an array in much the same way you instantiate an object of a user-defined class,by using the new keyword at the time of declaration.

Question 32

When you use the assignment operator with an array,individual elements are copied to another memory location.

Question 33

To declare and instantiate memory for 4 exam scores that range in value from 0 to 100,the following declaration could be made ____.

A) int examScore = new examScore[3];
B) int [ ] examScore = new examScore[4];
C) int [ ] examScore = new examScore[3];
D) int examScore[4] = new examScore[ ];

Question 34

Use .NET predefined methods and properties whenever possible as opposed to writing new
code.

Question 35

If an array named num is dimensioned to hold 10 values,what happens if you write num[100] = 50;?

A) A compilation error will be generated
B) A runtime error will be generated
C) 50 will be stored at the 100th indexed location
D) 50 will be stored at the last legal location

Question 36

int [ ] anArray = new int[24];
Array identifiers are normally defined using a plural noun.

Question 37

Given an array declared to hold 100 values,the smallest index that can be used with the array is ____.

A) based on what index is used when the first value is placed in the array
B) 1
C) 0
D) undetermined

Question 38

If you do not know how many entries will be stored with the array,you could dimension it ____.

A) small and then as more space is needed, adjust its size
B) large enough to hold the most likely number of entries
C) large enough to hold the maximum number of entries
D) as zero length and then add one to the length each time you add a value

Question 39

If you try to access the array using a negative index value,____.

A) a compilation error will be generate
B) a runtime error will be generated
C) the indexed location will be used. The computer will access memory to the left of the array
D) the smallest indexed location will be accessed

Question 40

Given an array declared to hold 100 values,the largest index that can be used with the array is:

A) based on what index is used when the first value is placed in the array
B) 99
C) 100
D) undetermined

Question 41

int [ ] anArray = new int [10];
int [ ] anotherArray = {6, 7, 4, 5, 6, 2, 3, 5, 9, 1};
Which of the following would copy all of the elements from anotherArray to anArray?

A) Array.Copy(anotherArray, 0, anArray, 0, 10);
B) Array.Copy(anotherArray, anArray)
C) anArray = anotherArray
D) all of the above

Question 42

When two or more arrays have a relationship such that you are able to use the same subscript or index to refer to related elements in the arrays,you have ____ arrays.

A) parallel
B) two dimensional
C) dynamic
D) related

Question 43

What happens when you assign one array to another using the assignment operator?

A) An error message is generated.
B) Elements are copied to new memory locations.
C) Both arrays become value type data elements.
D) Both arrays reference the same memory locations.

Question 44

One of the special properties in the Array class is Length.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 45

int [ ] anArray = new int [10];
int [ ] anotherArray = {6, 7, 4, 5, 6, 2, 3, 5, 9, 1};
anotherArray.Length returns ____.

A) 9
B) 10
C) 11
D) 20

Question 46

Which of the following could be a method heading for a member method that returns an array?

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

Question 47

int [ ] anArray = new int [10];
int [ ] anotherArray = {6, 7, 4, 5, 6, 2, 3, 5, 9, 1};
How could all values of anotherArray be totaled?

A) foreach(int val in anotherArray)
Total += val;
B) for (int i = 0; i < anotherArray.Length; i++)
Total += anotherArray;
C) Array.Sum(anotherArray)
D) all of the above

Question 48

A limitation of the foreach loop structure when used with arrays is ____.

A) it offers read only access
B) it can only be used with integer arrays
C) a loop control variable must be defined on the outside of the loop
D) the control variable must be updated with each iteration

Question 49

Given an array declaration of int anArray[1000],which of the following would be a valid heading for a method that sends the array in as a parameter?

A) void DisplayContents(int anArray)
B) void DisplayContents(int anArray[])
C) void DisplayContents(int [ ] anArray)
D) void DisplayContents(anArray[1000])

Question 50

If an array is to be sent to a method,which of the following is a valid heading for a method?

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

Question 51

Which of the following can be used to return an index of an item in an array?

A) LastIndexOf( )
B) Index( )
C) Find( )
D) SetValue( )

Question 52

____ creates a copy of the array and returns it as an object?

A) CopyObject( )
B) Clone( )
C) Copy( )
D) CreateArray( )

Question 53

foreach (int val in anotherArray) total += val;
Using the above declaration along with the foreach loop,what is stored in total after the program statements are executed?

A) 10
B) 2
C) 48
D) 45

Question 54

int [ ] score = {86,66,76,92,95,88}; for (int i = score.Length-1;i > -1;i--)
{
Total += score[i];
}
Using the declaration above for score,what is added to total during the first iteration?

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

Question 55

Given an array declaration of int anArray[1000],which of the following would be a valid call to a DisplayContents( )method to send the full array into the method as an argument?

A) DisplayContents(int anArray[1000])
B) DisplayContents(anArray[1000])
C) DisplayContents(anArray[ ] )
D) DisplayContents(anArray)

Question 56

for (int i = 0;i < anotherArray.Length;i++) total += i;
Using the above declaration along with the for loop,what is stored in total after the program statements are executed?

A) 10
B) 2
C) 48
D) 45

Question 57

Which loop structure can be used to change the contents of the array?

A) for
B) foreach
C) loop
D) if / else

Question 58

BinarySearch( )is ____.

A) a method in the Array class
B) an instance method
C) usable as long as you declare an array
D) must be used with integer arguments

Question 59

Which of the following is a valid example of calling a method and sending it an array argument?

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

Question 60

If you do not know the size of the array needed,you can create an array large enough to hold any number of entries and tell users to enter a predetermined sentinel value after they enter the last value.Using this approach:

A) requires that you increment a counter as values are entered so that you know how many elements are stored in your array
B) is preferred to defining a static sized array.
C) requires that you dimension the array to hold at least 100 entries.
D) requires the array be defined to hold string elements.

Question 61

The length or size of the array is specified using a(n)____________ value in the form of a constant literal,a variable,or an expression that produces an integer value.

Question 62

To create an array to hold the 5 numeric scores,you could write ____________.

Question 63

One of the special properties in the Array class is ____________.It returns an int representing the total number of elements in an array.

Question 64

All data values placed in an array must be of the same ____________.

Question 65

An entire array collection of data can be ordered alphabetically with a call to the Array class member method ____________.

Question 66

Elements in an array are sometimes referred to as ____________ variables.

Question 67

Array.Copy(waterDepth, 2, w, 0, 5);
The Copy( )method,shown above,is a(n)____________ method.

Question 68

All arrays,of any type,inherit characteristics from the ____________ class,which includes a number of predefined methods and properties.

Question 69

Use the ____________ keyword to instantiate an object of an array.

Question 70

Array identifiers are normally defined using a ____________.

Question 71

The ____________ loop structure can be used to iterate through an array.However,it can be used for read-only access to the elements.

Question 72

When you do a compile-time initialization of array elements,values are separated by ____________.

Question 73

The first element of an array is always referenced by index ____________.

Question 74

Arrays are ____________ variables.The array identifier memory location does not actually contain the values,but instead stores an address indicating the location of the first element in the array.

Question 75

To access an array element,you must specify which element is to be retrieved by placing an index inside ____________ following the array identifier