AP CSA Exam 8 Review

Consider the following method:

Assume that the array test has been declared and initialized as follows.

int[] test = {1, 3, 2, 5, 8, 7, 0};

What value will be returned as a result of the call mystery(test)?

• 4

• 6

• 11

• 13

• 26

Consider the following code segment.

int[][] matrix = new int[7][15];

Which of the following correctly gives the number of columns in the two-dimensional array matrix?

• matrix[0]

• matrix.length

• matrix[matrix.length - 1 ]

• matrix[0].length

• matrix.length[0]

3. Consider the following declaration for a two-dimensional array.

What element is displayed when the following line of code is executed?

System.out.println(grid[2][1]);

• 6

• 7

• 10

• 11

• 12

Consider the following method intended to swap the first and last rows in a two-dimensional array:

Which of the following correctly replaces / missing code */?

• 
• 
• 
• 
• none of the above

Consider the following method declaration.

Assume the 2D array, matrix, has been initialized to the following values:

4 6 -15

5 11 21

-11 -10 3

4 -10 -18

-21 14 -23

What is the value of matrix after the method call, increment(matrix); ?

• 4 6 -15

  5 11 21

  -11 -10 3

  4 -10 -18

  -21 14 -23

• 5 7 -15

  6 12 22

  -11 -10 4

  5 -10 -18

  -21 15 -23

• 5 7 -14

  6 12 22

  -10 -9 4

  5 -9 -17

  -20 15 -22

• 4 6 -16

  5 11 21

  -12 -11 3

  4 -11 -19

  -22 14 -24

• 5 7 -16

  6 12 22

  -12 -11 4

  5 -11 -19

  -22 15 -24

The following code is meant to find the smallest value in a 2-d array.

What should m be set to in order for the code to work as intended?

• 1000

• 0

• -100000

• Double.MIN_VALUE

• Double.MAX_VALUE

Consider the following code.

int[][] matrix = new int[4][5];

Suppose we want to initialize matrix to the following rows and columns.

0 1 2 3 4

4 3 2 1 0

0 1 2 3 4

4 3 2 1 0

Which of the options below correctly initializes matrix? (Choose all that apply)

• 
• 
• 

Consider the following code:

int[][] grid = /* code not shown */;

Which of the following could be used to calculate how many cells are in the array?

• grid[0].length * grid[0].length

• grid.length * grid[0].length

• grid[0].length

• grid.length

• grid.length * grid.length

Consider the following method that is intended to return true if all the Strings in the 2-d array arr have length 1:

public static boolean rowOfLengthOneStrings(String[][] a)

{ /* Missing Code / }

Which of the following could replace / Missing Code */ so that the method works as intended?

• 
• 
• 

What does the following segment of code do?

• It finds the sum of every other element in the array.

• It finds the sum of the elements in the even rows in the array.

• It finds the sum of the even elements in the array.

• It finds the sum of all elements in the array.

• It finds the sum of the elements in the even columns in the array.