Question 1

Which one of the following declaration statements is not a value type?
A) decimal grossPay = 0.0m;
B) int playerScore = 0;
C) bool qualify = false;
D) Random rand = new Random();

Accepted Answer

The declaration statement D creates a new instance of the reference type 'Random' using the 'new' keyword. The other three choices (A, B, C) declare value types (decimal, int, bool) that directly store their values in memory.

Question 2

Which one of the following statements assigns the value 40 to the first element in an array of integers named values?
A) values[-1] = 40;
B) values[0] = 40;
C) values[null] = 40;
D) values[1] = 40;

Accepted Answer

In an array, elements are accessed by their index number, starting from 0. Therefore, to assign the value 40 to the first element, we use the index 0 as follows: values[0] = 40; Option A assigns the value to an index that is out of bounds, option C uses the invalid keyword null as an index, and option D assigns the value to the second element of the array.

Question 3

A(n) ____________ is a special value that links a variable to an object.
A) linker
B) reference
C) operator
D) delimiter

Accepted Answer

A reference is a special value that links a variable to an object. It allows you to access an object without having to copy its value. References are commonly used in programming languages like C++ and Java, where they offer significant performance benefits over copying objects.

Question 4

A(n) ____________ is an object that can hold a group of values that must all be the same data type.
A) matrix
B) Collection
C) array
D) container

Accepted Answer

An array is a data structure that can store a fixed-size sequential collection of elements of the same data type. It is often used in programming for storing and manipulating data efficiently. Matrices and containers are more general terms that can refer to any collection of objects, while "Collection" typically refers to a more specific type of object in programming languages such as Java or C#. Therefore, the best choice for an object that can hold a group of values that must all be the same data type is an array.

Question 5

The ____________ creates an object in memory and returns a reference to that object.
A) .NET Framework
B) new operator
C) = operator
D) % operator

Accepted Answer

The new operator creates an object in memory and returns a reference to that object. The other options are not related to creating objects in memory.

Question 6

An array's____________ indicates the number of values that the array should be able to hold.
A) reference variable
B) size declarator
C) element
D) subscript

Accepted Answer

The size declarator, which is typically an integer value, specifies the maximum number of elements that an array can contain.

Question 7

A variable that is used to reference an object is commonly called a(n) ____________.
A) reference variable
B) object variable
C) class variable
D) Boolean variable

Accepted Answer

A reference variable is a variable that is used to refer to an object in memory. It does not contain the actual object, but instead provides a way to access it. So, Option A is the correct answer. B, C, and D are not correct because they do not accurately describe a variable that references an object.

Question 8

When a(n) ____________ variable is declared, the compiler sets aside, or allocates, a chunk of memory big enough to hold the variable's data.
A) reference type
B) uninitialized
C) value type
D) dynamic type

Accepted Answer

Value types are stored directly on the stack, and the compiler allocates a fixed amount of memory to hold the value's entire data. This means that the memory is allocated at compile-time and is fixed for the entire lifespan of the variable.

Question 9

Of the following statements, which one correctly initializes an int array named quarters with the values 1, 2, 3, and 4?
A) const int SIZE = 4; int[] quarters = new int[SIZE] { 1, 2, 3, 4 };
B) int[] quarters = new int[] { 1, 2, 3, 4 };
C) int[] quarters = { 1, 2, 3, 4 };
D) All of these statements are correct.

Accepted Answer

All of these statements correctly initialize an int array named quarters with the values 1, 2, 3, and 4. Each syntax variation is valid in C#.

Question 10

Look at the following code sample: const int SIZE = 10;
Int[] values = new int[SIZE];
For (int index = 0; index < SIZE; index++)
{
Values[index] = index + 1;
}
When the loop is finished stepping through the values array, what value will be stored in values[0]?
A) 10
B) 11
C) 0
D) 1

Accepted Answer

In the loop, each element of the values array is being assigned the value of its index plus one. Therefore, the value of values[0] will be 1, since its index is 0 and 0 + 1 = 1.

Question 11

When you create a numeric array in C#, what default value is assigned to its elements?
A) null
B) 0
C) 255
D) −1

Accepted Answer

The default value assigned to the elements of a numeric array in C# is 0.

Question 12

The storage locations in an array are known as ____________.
A) values
B) sectors
C) compartments
D) elements

Accepted Answer

The storage locations in an array are called elements. The values are the data that is stored in those elements, sectors are a subdivision of a storage device, and compartments are not typically used to describe storage in an array.

Question 13

Which one of the following assignment statements associates an int array, that can hold 12 integers, with a reference variable named scores?
A) scores = new int[12];
B) int[12] = new scores;
C) int scores[12];
D) new int scores[12]

Accepted Answer

The statement "scores = new int[12];" creates a new int array with a length of 12 and assigns it to the reference variable named scores.

Question 14

When you create an array, you can optionally initialize it with a collection of values called a(n) ____________.
A) initialization list
B) default group
C) element assembly
D) starting run

Accepted Answer

An initialization list is a collection of values used to initialize an array. It is the correct term for this concept and is commonly used in programming languages. B, C and D do not accurately describe this concept.

Question 15

It is preferred practice to use a(n) ____________ as an array's size declarator.
A) variable
B) literal value
C) named constant
D) object

Accepted Answer

Using a named constant as an array's size declarator is preferred practice because it increases code readability and maintainability. It allows for easy modification of the array size without having to modify all instances of the literal value throughout the code. In addition, using a variable or object as the size declarator can create complications as the size may change during program execution. Using a literal value may also reduce code readability and maintainability.

Question 16

Which one of the following statements correctly declares a reference variable named values that can be used to reference an array of int?
A) int values[];
B) values[int];
C) int[] values;
D) int [values];

Accepted Answer

Option C correctly declares a reference variable named values that can be used to reference an array of int. Option A also declares an array of int, but without naming the reference variable. Option B is not a valid declaration syntax for an array. Option D is also not a valid declaration syntax for an array.

Question 17

What special value are the elements of an array of reference type objects equal to by default?
A) 0
B) void
C) −1
D) null

Accepted Answer

In Java, the default value for elements of an array of reference type objects is null. This means that if you create an array of objects but do not initialize its elements, they will all initially be set to null. This is because reference type objects must be explicitly instantiated with the new keyword in order to create an instance of the object.

Question 18

Each element in an array is identified by a unique number known as a(n) ____________.
A) subscript
B) identifier
C) delimiter
D) vector

Accepted Answer

A subscript is a unique number that identifies each element in an array.

Question 19

When working with an array, it is important that you do not use a(n)____________.
A) invalid subscript
B) null value
C) assignment statement
D) initialization list

Accepted Answer

Using an invalid subscript can lead to accessing memory outside of the allocated space for the array, causing unexpected behavior or crashing the program. It is important to always use valid subscripts that are within the bounds of the array.

Question 20

Which one of the following statements is not a valid array declaration?
A) double[] parsecs = new double[10];
B) decimal[] sales = new decimal[24.5m];
C) string[] cities = new decimal[50];
D) int[] quarters = new int[4];

Accepted Answer

Array size cannot be a decimal value. Therefore, option B is not a valid array declaration.

Quiz 7: Arrays and Lists

Which one of the following declaration statements is not a value type?

Which one of the following statements assigns the value 40 to the first element in an array of integers named values?

A(n) ____________ is a special value that links a variable to an object.

A(n) ____________ is an object that can hold a group of values that must all be the same data type.

The ____________ creates an object in memory and returns a reference to that object.

An array's____________ indicates the number of values that the array should be able to hold.

A variable that is used to reference an object is commonly called a(n) ____________.

When a(n) ____________ variable is declared, the compiler sets aside, or allocates, a chunk of memory big enough to hold the variable's data.

Of the following statements, which one correctly initializes an int array named quarters with the values 1, 2, 3, and 4?

Look at the following code sample: const int SIZE = 10; Int[] values = new int[SIZE]; For (int index = 0; index < SIZE; index++) { Values[index] = index + 1; } When the loop is finished stepping through the values array, what value will be stored in values[0]?

When you create a numeric array in C#, what default value is assigned to its elements?

The storage locations in an array are known as ____________.

Which one of the following assignment statements associates an int array, that can hold 12 integers, with a reference variable named scores?

When you create an array, you can optionally initialize it with a collection of values called a(n) ____________.

It is preferred practice to use a(n) ____________ as an array's size declarator.

Which one of the following statements correctly declares a reference variable named values that can be used to reference an array of int?

What special value are the elements of an array of reference type objects equal to by default?

Each element in an array is identified by a unique number known as a(n) ____________.

When working with an array, it is important that you do not use a(n) ____________.

Which one of the following statements is not a valid array declaration?