Introduction to Arrays

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

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

•  0, 1, 2, 3
•  1, 2, 3, 4
• 2, 4, 6, 8
•  0, 2, 4, 6

Which of the following declares an array of int named img?

• int img;
• int[] img;
• new int img[];
• int img = int[];

What is the output of the following code fragment:

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

•  2 6
• 8
•  2 4
•  6 8

What is the output of the following code fragment:

int[] ar = {2, 4, 6, 8 }; ar[0] = 23; ar[3] = ar[1]; SOP( ar[0] + " " + ar[3] );
 

• 23 2
• 2 8
• 31
• 23 4

What is the output of the following code fragment:

int[] y = new int[5]; y[0] = 34; y[1] = 88; SOP( y[0] + " " + y[1] + " " + y[5] );

• 34 88 0
• 34 88 88
•  The program is defective and will not compile.
• 0 34 88

What is the output of the following code fragment:

int[] z = new int[9]; 
z[0] = 7;
z[1] = 3; 
z[2] = 4; 
SOP(z[0] + z[1] + " " + z[5] ); 

• 10 0
• 7 3 0
• The program is defective and will not compile.
• 7 3 4

What expression represents the last element of any size array named array?

• array[length-1]
• array[length]
•  array[array.length]
  
• array[array.length-1]

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 ] );

• 7
• 3
• 4
• 1

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

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

• 2
• 7
• 14
• 1

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

• Holding the scores on twelve midterms exams of a class
• Holding the name, social security number, age, and income of one individual.
• Holding the temperature readings taken every hour throughout a day.
• Holding the total sales a store made in each of twelve months.