Question 1

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?

Accepted Answer

Option A correctly demonstrates how to iterate through each element of the array `anotherArray` and sum up its values using a `foreach` loop. Options B and C are syntactically incorrect or do not represent valid C# code for summing the elements of an array.

Question 2

One of the special properties in the Array class is Length. It returns ____.

Accepted Answer

The Length property of the Array class returns an int representing the size the array was dimensioned, which is the number of elements in the array. It does not return the number of values currently stored in the array or the length of an individual element of the array. It also does not return how much storage is consumed by the entire array.

Question 3

BinarySearch( ) is ____.

Accepted Answer

BinarySearch( ) is a method in the Array class.

Question 4

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

Accepted Answer

The method that creates a copy of the array and returns it as an object is called Clone( ). Therefore, the best choice is B. The other options are incorrect as they do not represent the method that creates a copy of the array.

Question 5

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:

Accepted Answer

Using a predetermined sentinel value requires keeping track of how many elements have been entered so that the array can be properly sized. Therefore, incrementing a counter as values are entered is necessary.

Question 6

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

Accepted Answer

The for loop iterates through the indices of the array anotherArray, which has 10 elements. The total variable adds up the indices on each iteration (0+1+2+3+4+5+6+7+8+9), resulting in a total of 45.

Question 7

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?

Accepted Answer

This option correctly uses the Array.Copy() method to copy all elements from anotherArray to anArray, specifying the source array, starting index, destination array, starting index, and number of elements to copy. Option B is incorrect syntax and option C simply assigns the reference of anotherArray to anArray, not copying the elements. Therefore, option A is the best choice.

Question 8

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

Accepted Answer

Option A is the valid heading for a method which takes an array as input parameter. The heading "void DisplayOutput(double [ ] anArray)" specifies that the method expects an array of doubles as input, and the name of the array parameter is "anArray". The square brackets "[]" indicate that an array is being passed, but the size of the array is not specified. If the size of the array was specified (as in option B or D), it would result in a compilation error. Option C is also incorrect as it does not specify that an array is being passed.

Question 9

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

Accepted Answer

Option C is the correct method heading for a member method that returns an array. It specifies that the method returns an integer array (int[]), and the method name (DoSomething) follows standard naming conventions for C# methods. Option A is incorrect because it specifies both an integer array return type and a void return type. Option B is incorrect because it puts the void return type before the method name. Option D is incorrect because it uses square brackets instead of parentheses to specify the return type.

Question 10

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.

Accepted Answer

Parallel arrays have a specific relationship where each element in one array corresponds to the element at the same index in the other array. For example, if you have an array of student names and an array of their corresponding grades, you can use the same index to refer to both the student name and their grade. This relationship creates parallelism between the two arrays. Two dimensional arrays have rows and columns and are not necessarily related in this way. Dynamic and related are not specific types of arrays but rather general terms that can apply to any type of array.

Question 11

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

Accepted Answer

Option B is correct because it correctly calls a method named DisplayArrayContents and passes an array named anArray as an argument. The syntax does not specify the type or size of the array in the method call, which is the correct way to pass an array to a method. Options A, C, and D are incorrect because they attempt to specify type or size in the method call, which is not how method calls are formatted in languages like Java or C#.

Question 12

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?

Accepted Answer

The answer of Given an array declaration of int anArray[1000],...

Question 13

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?

Accepted Answer

Option D is the correct choice as it passes the array name 'anArray' as a pointer to the first element of the array without specifying the size. This is the most common and preferred approach. Option A is not valid because specifying the size in the argument is unnecessary and can lead to errors. Option B is incorrect because it only passes the last element of the array. Option C is also incorrect because it does not specify any size or pointer to the array.

Question 14

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

Accepted Answer

LastIndexOf() is a method used to return the index of the last occurrence of a specified value in an array.

Question 15

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?

Accepted Answer

During the first iteration, the value at the last index of the array (88) is added to Total.

Question 16

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

Accepted Answer

When one array is assigned to another using the assignment operator, both arrays reference the same memory locations. This means that modifying one array will also modify the other array since they point to the same data in memory.

Question 17

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

Accepted Answer

The foreach loop iterates over each element in the anotherArray and adds it to the total variable. The total sum of all the elements in the array is 48.

Question 18

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

Accepted Answer

The for loop is best suited for changing the contents of an array as it allows us to iterate through each element of the array and apply the necessary changes. It also provides us with control over the number of iterations and the order in which the elements are accessed. The foreach loop is useful for accessing the elements of an array, but not for changing them. The loop and if/else structures are not specifically designed for array manipulation.

Question 19

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

Accepted Answer

The foreach loop structure is used for reading values from an array and cannot be used to modify the contents of the array. Therefore, it offers read only access to the elements of an array.

Question 20

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

Accepted Answer

The length of an array in Java is the total number of elements it can hold. `anotherArray` is initialized with 10 elements, so `AnotherArray.Length` (which should be correctly referred to as `anotherArray.length` in Java) returns 10.

Quiz 7: Arrays

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?