Quiz -- Arrays

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1. Which of the following declares an array of int named img?
a. int img;
b. int[] img;
c. new int img[];
d. int img = int[];

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

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

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

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

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

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

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

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

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.

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