Quiz on Arrays

Instructions: For each question, choose the single best answer. Make your choice by clicking on its button. You can change your answers at any time. When the quiz is graded, the correct answers will appear in the box at the bottom of the question.

1. Which of the following declares a reference variable for an array of int?

a. int img;

b. int[] img;

c. new int img[];

d. int img = int[];

Correct Answer Is:

2. What are the legal indexes for the array ar, given the following declaration: 

int[] ar = {2, 4, 6, 8 }

a. 0, 1, 2, 3

b. 1, 2, 3, 4

c. 2, 4, 6, 8

d. 0, 2, 4, 6

Correct Answer Is:

3. What is the output of the following code fragment: 

int[] ar = {2, 4, 6, 8 };
System.out.println( ar[0] + " " + ar[1] );

a. 2 6

b. 8

c. 2 4

d. 6 8

Correct Answer Is:

4. What is the output of the following code fragment: 

int[] ar = {2, 4, 6, 8 };

ar[0] = 23;
ar[3] = ar[1];

System.out.println( ar[0] + " " + ar[3] );

a. 23 2

b. 2 8

c. 31

d. 23 4

Correct Answer Is:

5. What is the output of the following code fragment: 

int[] y = new int[5];

y[0] = 34;
y[1] = 88;

System.out.println( y[0] + " " + y[1] + " " + y[5] );

a. 34 88 0

b. 34 88 88

c. The program is defective and will not compile.

d. 0 34 88

Correct Answer Is:

6. What is the output of the following code fragment: 

int[] z = new int[9];

z[0] = 7;
z[1] = 3;
z[2] = 4;

System.out.println( z[0] + z[1] + " " + z[5] );

a. 10 0

b. 7 3 0

c. The program is defective and will not compile.

d. 7 3 4

Correct Answer Is:

7. What is the output of the following code fragment: 

int[] zip = new int[5];

zip[0] = 7;
zip[1] = 3;
zip[2] = 4;
zip[3] = 1;
zip[4] = 9;

System.out.println( zip[ 2 + 1 ] );

a. 4 3

b. 3 7

c. 4

d. 1

Correct Answer Is:

8. What is the output of the following code fragment: 

int[] zip = new int[5];

zip[0] = 7;
zip[1] = 3;
zip[2] = 4;
zip[3] = 1;
zip[4] = 9;

int j = 3;

System.out.println( zip[ j-1 ] );

a. 7

b. 3

c. 4

d. 1

Correct Answer Is:

9. How many objects are present after the following code fragment has executed? 

double[] ann = new double[ 7 ];
double[] bob;

bob = ann;

a. 2

b. 7

c. 14

d. 1

Correct Answer Is:

10. For which of the following applications is an array NOT suitable:

a. Holding the scores on twelve midterms exams of a class.

b. Holding the name, social security number, age, and income of one individual.

c. Holding the temperature readings taken every hour throughout a day.

d. Holding the total sales a store made in each of twelve months.

Correct Answer Is:

11. Which of the following is FALSE

a. All the elements of an array are of the same type.

b. The length of an array can be changed after its creation.

c. Arrays are objects.

d. The cells of an array are numbered sequentially starting at zero.

Correct Answer Is:

12. What is the output of the following fragment? 


int arr[] = new int[15];  
System.out.println(arr[0]);
System.out.println(arr[1]);

a. 

0
0

b. 

random value
random value

c. The program will throw an Exception at run-time.

d. The program will not compile.

Correct Answer Is:

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