COP3252 Chapter 7

Question 1

Data Structures of Fixed Length

Answer 1

Array

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:

Answer 2

9

Question 3

T or F

An array must be declared and then created before being used.

Answer 3

True

Question 4

What does the following statement do?

double[] array = new double[14];

Answer 4

This creates a 14 element array of doubles

Question 5

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

ArrayElementOutOfBoundsException

ArrayOutOfBoundsException

ArrayException

ArrayIndexOutOfBoundsException

Answer 5

ArrayIndexOutofBoundException

Question 6

T or F

The following statement creates an array of book objects.

new Book() books[];
books = new Book[ numberElements ];

Answer 6

False

Question 7

T or F

The following statement creates an array of book objects.

Book[] books;
books = new Book[ numberElements ];

Answer 7

True

Question 8

Consider the program below:

public class Test
{
   public static void main( String[] args )
   {
      int[] a;
      a = new int[ 10 ];

      for ( int i = 0; i < a.length; i++ )
         a[ i ] = i + 2;
      int result = 0;
      for ( int i = 0; i < a.length; i++ )
         result += a[ i ];
      System.out.printf( "Result is: %d\n", result );
   } // end main
} // end class Test

The output of this program will be:

Answer 8

65

Question 9

Which statement correctly passes the array items to method takeArray? Array items contains 10 elements.

takeArray(items[10])
takeArray( items[])
takeArray( items )
takeArray( items[ 9 ] )

Answer 9

takeArray( items )

Question 10

The preferred way to traverse a two-dimensional array is to use

Answer 10

two nested for loops

Question 11

Which function is used to convert a string variable to integer?
convert.toInt(variable);
convert.partInt(variable);
variable.parseInt();
Integer.parseInt(variable);

Answer 11

Integer.parseInt(variable);

Question 12

Lists and tables of values can be stored in which data structures?

Answer 12

arrays and collections

Question 13

A collection of variables of the same data type stored contiguously in memory

Answer 13

Array

Question 14

What does an enhanced for statement do?

Answer 14

it allows you to iterate through an array without a counter

Question 15

the number used to refer to a particular element of an array is a…

Answer 15

index

Question 16

What type of array has two indices?

Answer 16

a 2 dimensional array

Question 17

Which statement iterates through an array of doubles called numbers.

foreach (double:numbers);
for(double d:numbers);
while(double d :numbers: d++);
for(number n:numbers);

Answer 17

for(double d:numbers);

Question 18

Command line arguments are stored in ____________

Answer 18

an array of strings called args

Question 19

Use the expression ___________ to receive the total number of arguments in a command line. Assume that command-line arguments are stored in String[] args.

Answer 19

args.length

Question 20

Given the command java MyClass test, the first command-line argument is

Answer 20

test

Question 21

An _____________ in the parameter list of a method indicates that the method can receive a variable number of arguments.

Answer 21

… (ellipse)