Deck 8: Arrays;Introduction to Exception Handling

Question 1

Consider the code segment below.Which of the following statements is false
Int[] g;
G = new int[23];

A) The first statement declares an array reference.
B) The second statement creates the array.
C) g is a reference to an array of integers.
D) The value of g[3] is -1.

Answer 1

D

Question 2

Consider the array:
S[0] = 7
S[1] = 0
S[2] = -12
S[3] = 9
S[4] = 10
S[5] = 3
S[6] = 6
The value of s[s[6] - s[5]] is:

A) 0
B) 3
C) 9
D) 0

Answer 2

C

Question 3

Arrays are data structures.

A) constant
B) dynamic
C) static
D) None of the above.

Answer 3

C

Question 4

The position number in parentheses is formally called an index.

Question 5

Which of the following statements about arrays are true
A)An array is a group of variables that all have the same type.
B)Elements are located by index or subscript.
C)The length of an array c is determined by the expression c.Length.
D)The zeroth element of array c is specified by c[0].

A) A, C, D.
B) A, B, D.
C) C, D.
D) A, B, C, D.

Question 6

An array must be declared and allocated in the same statement.

Question 7

Arrays are allocated with the keyword

A) new
B) array
C) table
D) None of the above.

Question 8

Arrays remain the same size once they're created.

Question 9

The index of an array must be an integer;it cannot include variables or expres
sions.

Question 10

In an array of reference types,each element may be a reference to a different type.

Question 11

Which of the following correctly declares and allocates an array of double values

A) double A[15];
B) double() A = new double[15];
C) double[] A = new double[25];
D) All of the above.

Question 12

The number in square brackets after an array name is the of an item.

A) value
B) position
C) size
D) None of the above.

Question 13

An array can be supplied values in its declaration by providing an

A) initializer list
B) index
C) array allocation
D) None of the above.

Question 14

Arrays may have dimensions.

A) one
B) two
C) more than two
D) All of the above.

Question 15

Arrays are data structures that may consist of data items of different types.

Question 16

The number of elements in an array must be specified in brackets after the array name in the declaration.

Question 17

Each reference in an array of references is set to null by default when the array is allocated.

Question 18

Which of the following correctly accesses element 13 of array Book

A) Book[0] + 13
B) Book[13]
C) Book[12]
D) None of the above.

Question 19

Arrays can be declared to hold only non-class data types.

Question 20

The first element in every array is the 0th element.

Question 21

Which of the following will not produce a compiler error

A) Changing the value of a constant after it is declared.
B) Changing the value at a given index of an array after it's created.
C) Using a final variable before it is initialized.
D) All of the above will produce compiler errors.

Question 22

Which of the following statements about creating arrays and initializing their elements is false

A) The new keyword should be used to create an array.
B) When an array is created, the number of elements must be placed in square brackets following the type of element being stored.
C) The elements of an array of integers have a value of null before they are initialized.
D) A for loop is an excellent way to initialize the elements of an array.

Question 23

Invalid possibilities for array indices include.

A) positive integers
B) negative integers
C) non-consecutive integers
D) zero

Question 24

Consider the class below:
Class Test
{
Static void Main()
{
Int[] a = {99,22,11,3,11,55,44,88,2,-3};
Int result = 0;
For (int i = 0;i < a.Length;++i)
{
If (a[i] > 30)
{
Result += a[i];
}
}
Console.WriteLine($"Result is: {result}");
}
}
The output of this C# program will be:

A) Result is: 280
B) Result is: 154
C) Result is: 286
D) Result is: 332

Question 25

The foreach repetition statement requires that you provide an array and a variable for the purpose of:

A) preventing the structure from going past the end of the array
B) storing the value of each element that is traversed
C) acting as a counter to traverse the array
D) None of the above.

Question 26

Attempting to access an array element out of the bounds of an array causes a(n)________.

A) ArrayOutOfBoundsException.
B) ArrayElementOutOfBoundsException.
C) IndexOutOfRangeException.
D) ArrayException.

Question 27

Consider the class below:
Class Test
{
Static void Main()
{
Int[] a = new int[10];
For (int i = 0;i < a.Length;++i)
{
A[i] = i + 1 * 2;
}
Int result = 0;
For (int i = 0;i < a.Length;++i)
{
Result += a[i];
}
Console.WriteLine($"Result is: {result}");
}
}
The output of this C# program will be:

A) Result is: 62
B) Result is: 64
C) Result is: 65
D) Result is: 67

Question 28

What do the following statements do
Double[] array;
Array = new double[14];

A) Creates a double array containing 13 elements.
B) Creates a double array containing 14 elements.
C) Creates a double array containing 15 elements.
D) Declares but does not create a double array.

Question 29

When values are provided upon declaration of an array,the new keyword is not required.

Question 30

The foreach statement is preferred over the for statement when the indices of the elements in an array will be used in the body of the repetition statement.

Question 31

Values in an array can be totaled by using the ArrayTotal method.

Question 32

What can foreach statements iterate through

A)arrays
B)collections
C)databases
D) a and b

Question 33

Constants are declared using keyword

A) static
B) const
C) fixed
D) None of the above.

Question 34

Which expression adds 1 to the element of array arrayName at index i,assuming the array is of type int

A) ++arrayName[i]
B) arrayName++[i]
C) arrayName[i++]
D) None of the above.

Question 35

C# automatically performs bounds checking to ensure the program doesn't access data outside the bounds of an array.

Question 36

Constant variables also are called.

A) write-only variables
B) finals
C) named constants
D) All of the above

Question 37

When a C# program executes,the runtime checks array element indices for validity-all indices must be greater than or equal to 0 and less than the length of the array.Any attempt to access an element outside that range of indices results in a runtime error known as a(n)________.

A) IndexRangeError
B) SubscriptException
C) IndexOutOfRangeException
D) SubscriptRangeError

Question 38

What is the proper foreach header format

A)(foreach type_identifer in arrayName)
B)foreach (arrayName)
C)foreach (type_identifer in arrayName)
D)None of the above.

Question 39

Which of the following initializer lists would correctly set the elements of array n

A) int[] n = {1, 2, 3, 4, 5};
B) array n[int] = {1, 2, 3, 4, 5};
C) int n[5] = {1; 2; 3; 4; 5};
D) int n = new int(1, 2, 3, 4, 5);

Question 40

A constant must be initialized in the same statement where it is declared and cannot be modified.

Question 41

There are two types of multidimensional arrays:

A) quadrangular and rectangular
B) rectangular and jagged
C) quadrangular and jagged
D) None of the above

Question 42

If you want to pass an array element into a method by reference,what will you need to do

A) It always passes the element as a reference automatically.
C) All of the above.
D) None of the above, passing in by reference of an array element is only possible if the array type is a reference type.

Question 43

Consider array items,which contains the values 0,2,4,6 and 8.If method changeArray is called with changeArray(items,items[2]),what values are stored in items after the method has finished executing
Public static void ChangeArray(int[] passedArray,int value)
{
PassedArray[value] = 12;
Value = 5;
}

A) 0, 2, 5, 6, 12
B) 0, 2, 12, 6, 8
C) 0, 2, 4, 6, 5
D) 0, 2, 4, 6, 12

Question 44

Which of the following statements is false

A) When the runtime or a method detects a problem, such as an invalid array index or an invalid method argument, it throws an exception-that is, an exception occurs.
B) Exceptions are always thrown by the runtime.
C) To handle an exception, place any code that might throw an exception in a try statement.
D) The try block contains the code that might throw an exception, and the catch block contains the code that handles the exception if one occurs.

Question 45

Which of the following statements is false

A) You can have many catch blocks to handle different types of exceptions that might be thrown in the corresponding try block.
B) The runtime performs array bounds checking.
C) When an exception is thrown, the try block in which it occurs terminates and a corresponding catch block, if there is one, begins executing-if you declared any variables in the try block, they are accessible in the catch block.
D) The catch block declares an exception parameter's type and name. The catch block can handle exceptions of the specified type.

Question 46

[C#6] Which of the following statements is false

A)Prior to C# 6,auto-implemented properties required both a get and a set accessor.
B)Client code can use C# 6 getter-only auto-implemented properties only to get each property's value.
C)C#6 getter-only auto-implemented properties are read only.
D)C#6 getter-only auto-implemented properties can be initialized only in their declarations.

Question 47

Consider integer array values,which contains 5 elements.Which statements successfully swap the contents of the array at index 3 and index 4

A) values[3] = values[4];
B) values[4] = values[3];
C) int temp = values[3];
D) int temp = values[3];

Question 48

To pass an array argument to a method,specify the name of the array followed by empty brackets.

Question 49

When an exception is caught,the program can access the exception object's built-in ________ property to get the error message and display it.

A) Error
B) Fault
C) Message
D) Note

Question 50

Which function is called when an object is used where a string should be

A)TranslateToString()
B)String()
C)ConvertToString()
D)ToString()

Question 51

Individual elements of arrays are passed to methods by value.

Question 52

When accessing an element of an array,operations (calculations)are not allowed inside the brackets of an array.

Question 53

The keyword _______ overrides an existing method with the same signature.

A)replace
B) override

Question 54

[C#6] Initializing an auto-implemented property in its declaration is a C# 6 feature known as auto-property initializers.Which of the following is the general syntax for a read-write auto-implemented property with an initializer

A)Type PropertyName {get,set;} = initializer;
B)Type PropertyName {get | set} = initializer;
C)Type PropertyName {get;set} = initializer;
D)Type PropertyName {get;set;} = initializer;

Question 55

Arrays can hold simple types and reference types.

Question 56

Which method call does the method header void ModifyArray(double[]
B) ModifyArray(double[] : list)
B) represent
C) ModifyArray(double list[])
D) ModifyArray(list)

Question 57

Suppose that class Book has been defined.Which of the following creates an array of Book objects

A) Book[] books = new Book[numberElements];
B) Book[] books = new Book()[numberElements];
C) new Book() books[];
D) All of the above.

Question 58

Which of the following statements is false

A) An exception indicates a problem that occurs while a program executes.
B) Exception handling helps you create fault-tolerant programs.
C) When an exception is handled, the program continues executing as if no problem was encountered.
D) The compiler does not detect exceptions.

Question 59

Which foreach header represents iterating through an array of int named numbers

A)foreach (numbers)
B) foreach (number in numbers)
C) foreach (int number in numbers)
D) foreach (int number in int[] numbers)

Question 60

Changes made to an entire array that has been passed to a method will not affect the original values of the array.

Question 61

The foreach statement can be used only with one-dimensional arrays.

Question 62

When dealing with multi-dimensional arrays,each "row" must be the same size.

Question 63

An array with m rows and n columns is not:
A)An m-by-n array.
B)An n-by-m array.
C)A two-dimensional array.
D)An n times m dimensional array.

A) A and C
B) A and D
C) B and D
D) B and C

Question 64

For the array in the previous question,what is the value returned by items[1, 0].

A) 4
B) 8
C) 12
D) 6

Question 65

Jagged arrays are maintained as arrays of arrays.

Question 66

Multi-dimensional arrays require two or more indices to identify particular elements.

Question 67

Variable-length argument lists allow you to create methods that receive an arbitrary number of arguments.

Question 68

Tables are often represented with rectangular arrays.

Question 69

By convention,the first set of brackets of a two-dimensional array identifies an element's column and the second identifies the row.

Question 70

Which of the following sets of statements creates a multidimensional array with 3 rows,where the first row contains 1 value,the second row contains 4 items and the final row contains 2 items

A)
B)
C)
D)

Question 71

In rectangular array items,which expression below retrieve the value at row 3 and column 5

A) items[3. 4]
B) items[3][4]
C) None of the above.
C) items[3, 4]

Question 72

Which statement below initializes array items to contain 3 rows and 2 columns

A) int[,] items = {{2, 4}, {6, 8}, {10, 12}};
B) int[,] items = {{2, 6, 10}, {4, 8, 12}};
C) int[,] items = {2, 4}, {6, 8}, {10, 12};
D) int[,] items = {2, 6, 10}, {4, 8, 12};

Question 73

What is the keyword associated with variable-length argument lists

A) arg
B) params
C) var
D) vla

Question 74

Which set of statements totals the items in each row of two-dimensional array items,and displays each total

A) int total = 0;
B) int total = 0;
C) int total = 0;
D) int total = 0;

Question 75

Which of the following correctly declares and initializes a two-dimensional rectangular array of integers

A) int[,] sum = new int[3, 4];
B) int[] sum = new int[2, 4];
C) int sum[] = new int[2, 2];
D) None of the above.

Question 76

is (are)typically used to traverse a two-dimensional array.

A) A do while statement
B) A for statement
C) Two nested for statements
D) Three nested for statements

Question 77

Rectangular arrays are often used to represent tables of values consisting of information arranged in:

A) rows
B) columns
C) both a and b
D) None of the above

Question 78

Which of the following statements creates a multidimensional array with 3 rows,where the first row contains 1 item,the second row contains 4 items and the final row contains 2 items

A) int[][] items = {new int {1, null, null, null},
New int {2, 3, 4, 5},
New int {6, 7, null, null}};
B) int[][] items = {new int {1},
New int {2, 3, 4, 5},
New int {6, 7}};
C) int[][] items = {new int {1},
New int {2, 3, 4, 5},
New int {6, 7},
New int {});
D) int[][] items = {new int {1},
New int {4},
New int {2}};

Question 79

One could iterate through multi-dimensional arrays by using nested for loops.

Question 80

What kinds of arrays can variable-length argument lists work with

A) one-dimensional arrays