AP CS A Quiz: Unit 1

Which of the following is NOT a Java primitive type

• double

• float

• int

• String

Which of the following statements is true about variables?

• The memory associated with a variable of a primitive type holds an actual primitive value.

• When a variable is declared final, its value can only be changed through a direct reassignment.

• A variable originally created as an int can be changed to store a double through casting.

• All of these choices are true

What is the value of x after this code runs?

int x = 5;

x = 10;

x = 4;

• 5

• 10

• 4

• true

What is the proper syntax to declare and initialize a variable called

temperature

to have the value

70.4?

• int temperature = 70.4;

• double temperature = 70.4;

• temperature = 70.4;

• temperature = (double) 70.4

What is the result of this expression?

(int) (2 + 1 / 3 + 1)

• 2

• 3

• 3.33

• 4

• 0

Which expression returns the one’s place of an integer x like 23?

• x % 10

• x / 10

• x % 100

• x + 1

What is the value of myInteger after this line of code is executed?

int myInteger = (int) 5.6;

• 6

• 5.6

• 5

• 9

• 0

What output will be produced by

System.out.println("Hello");

System.out.println("Karen");

• Hello Karen

• HelloKaren

• Hello

  Karen

• Error

Refer to the following code segment:

double myDouble = 1/4;

System.out.println("1 / 4 = " + myDouble);

The output of the code is:

1 / 4 = 0.0

You wanted the output to be

1 / 4 = 0.25

Which change to the first line of their code segment would get you the answer you wanted?

• int myDouble = 1/4;

• double myDouble = (double) 1/4;

• double myDouble = (int) 1/4;

• double myDouble = (int) (1.0/4.0);

Karen’s Pizza is creating a program that will calculate the total amount of money an employee earns each week. Employees are paid by the hour and only work in 1 hour increments. Salaries start at minimum wage, but employees get a $0.50 raise after the first month. Which variables would be the best to store the hours and salary of the employees?

• double hours

  int salary

• int hours

  double salary

• boolean hours

  double salary

• int hours

  int salary

• double hours

  boolean salary