Question 1

Languages such as Visual Basic, BASIC, and COBOL use ____ to refer to individual array elements.
A) ( )
B) [ ]
C) { }
D) < >

Accepted Answer

Languages like Visual Basic, BASIC, and COBOL use parentheses "()" to refer to individual array elements.

Question 2

When you declare an array name, no computer memory address is assigned to it. Instead, the array variable name has the special value ____, or Unicode value '\u0000'.
A) empty
B) null
C) false
D) zero

Accepted Answer

When you declare an array name, no computer memory address is assigned to it. Instead, the array variable name has the special value null, which means that it does not currently point to a memory location.

Question 3

To initialize an array, you use an initialization list of values separated by commas and enclosed within curly braces.

Accepted Answer

This is true, initializing an array involves enclosing a list of values within curly braces, separated by commas.

Question 4

After you create an array variable, you still need to ____ memory space.
A) create
B) organize
C) reserve
D) dump

Accepted Answer

When we create an array variable, we need to reserve a contiguous block of memory space to store the elements of the array. This memory reservation is done using the "new" keyword in languages like Java and C#.

Question 5

When an application contains an array and you want to use every element of the array in some task, it is common to perform loops that vary the loop control variable from 0 to one less than the size of the array.

Accepted Answer

This is a common practice in programming to access every element of an array using a loop. The loop control variable is usually initialized to 0 and incremented until it reaches one less than the size of the array in order to access all the elements.

Question 6

When you create an array variable, memory space is automatically reserved.

Accepted Answer

The answer of When you create an array variable, memory...

Question 7

When you declare or access an array, you can use any expression to represent the size, as long as the expression is  _____.
A) a variable
B) enclosed in brackets
C) an integer
D) a list

Accepted Answer

When declaring or accessing an array, the size or index must be an integer or an expression that evaluates to an integer. This is because array sizes and indices must be discrete, countable numbers to allocate memory or access specific elements.

Question 8

When array elements are passed by value, a copy of the value is made and used within the receiving method.

Accepted Answer

When array elements are passed by value, a copy of the reference to the array is made and used within the receiving method, not a copy of the actual elements. Any changes made to the elements within the receiving method will also affect the original array outside of the method.

Question 9

When you want to determine whether a variable holds one of many valid values, one option is to use a do…while loop to compare the variable to a series of valid values.

Accepted Answer

A better option would be to use a conditional statement, such as an if statement or a switch statement, to compare the variable to the valid values. A do…while loop is typically used when you need to repeatedly execute a block of code while a condition is true, but it doesn't make sense to use it to compare a variable to a fixed set of valid values.

Question 10

Since an array name is a reference, you are able to use the = operator for assigning and the == operator for comparisons.

Accepted Answer

In C and C++, an array name is not a reference but a pointer to the first element of the array. You cannot use the = operator to assign one array to another directly. For comparison, the == operator compares the addresses pointed to by the array names, not the contents of the arrays.

Question 11

When returning an array reference, square brackets are included with the return type in the method header.

Accepted Answer

When returning an array reference, square brackets are included with the return type in the method header to indicate that the method is returning an array.

Question 12

In Java, boolean array elements automatically are assigned the value ____.
A) null
B) '\u0000'
C) true
D) false

Accepted Answer

By default, Java initializes boolean arrays with false values. Therefore the correct choice is D, false.

Question 13

Parallel arrays do not necessarily have the same number of elements.

Accepted Answer

Parallel arrays are designed to have the same number of elements, where each element in one array corresponds to an element in the other arrays at the same index.

Question 14

You use a ____ following the closing brace of an array initialization list.
A) .
B) ;
C) :
D) ,

Accepted Answer

In Java, after the closing brace of an array initialization list, a semicolon (;) is used to terminate the statement.

Question 15

When any ____ type ( boolean , char , byte , short , int , long , float , or double ) is passed to a method, the value is passed.
A) array
B) dummy
C) element
D) primitive

Accepted Answer

Only primitive types (boolean, char, byte, short, int, long, float, and double) are passed by value. Arrays and objects in Java are always passed by reference.

Question 16

Providing values for all the elements in an array is called ____ the array.
A) populating
B) declaring
C) filling
D) irrigating

Accepted Answer

Populating an array means providing values for all the elements in the array. Declaring an array means defining its type and name. Filling an array is a general term that could refer to populating or adding elements to an array. Irrigating is not a term typically used in programming.

Question 17

When you create an array of objects, each reference is assigned the value ____.
A) null
B) '\u0000'
C) true
D) false

Accepted Answer

When an array of objects is created, each reference is initially assigned the value null, indicating that it does not refer to any object.

Question 18

A(n) ____ is an integer contained within square brackets that indicates one of an array's variables.
A) postscript
B) subscript
C) variable header
D) indicator

Accepted Answer

A subscript is an integer contained within square brackets that indicates one of an array's variables.

Question 19

You can declare an array variable by placing curly brackets after the array name.

Accepted Answer

An array variable is declared by specifying the data type followed by square brackets containing the size of the array. For example, int[] myArray = new int[5];

Question 20

When using parallel arrays, if one array has many possible matches, it is most efficient to place the less common items first so that they are matched right away.

Accepted Answer

In parallel arrays, the efficiency of finding matches is not influenced by the order of items since each element in one array is typically associated with elements in the other arrays by their index. The concept of placing less common items first to improve match efficiency does not apply to the structure or usage of parallel arrays.

Quiz 8: Arrays

Languages such as Visual Basic, BASIC, and COBOL use ____ to refer to individual array elements.

When you declare an array name, no computer memory address is assigned to it. Instead, the array variable name has the special value ____, or Unicode value '\u0000'.

To initialize an array, you use an initialization list of values separated by commas and enclosed within curly braces.

After you create an array variable, you still need to ____ memory space.

When an application contains an array and you want to use every element of the array in some task, it is common to perform loops that vary the loop control variable from 0 to one less than the size of the array.

When you create an array variable, memory space is automatically reserved.

When you declare or access an array, you can use any expression to represent the size, as long as the expression is _____.

When array elements are passed by value, a copy of the value is made and used within the receiving method.

When you want to determine whether a variable holds one of many valid values, one option is to use a do…while loop to compare the variable to a series of valid values.

Since an array name is a reference, you are able to use the = operator for assigning and the == operator for comparisons.

When returning an array reference, square brackets are included with the return type in the method header.

In Java, boolean array elements automatically are assigned the value ____.

Parallel arrays do not necessarily have the same number of elements.

You use a ____ following the closing brace of an array initialization list.

When any ____ type ( boolean , char , byte , short , int , long , float , or double ) is passed to a method, the value is passed.

Providing values for all the elements in an array is called ____ the array.

When you create an array of objects, each reference is assigned the value ____.

A(n) ____ is an integer contained within square brackets that indicates one of an array's variables.

You can declare an array variable by placing curly brackets after the array name.

When using parallel arrays, if one array has many possible matches, it is most efficient to place the less common items first so that they are matched right away.