CS 2 Unit 1 Review

Which of the following is not a primitive type?

• int

• double

• String

• boolean

• char

What is the value of x after this code runs?

int x = 5;

x = 10;

x = 4;

• 5

• 10

• 4

• true

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

int myInteger = (int) 5.6;

• 6

• 5.6

• 5

• 9

What output will be produced by

System.out.println("Hello");

System.out.println("Karel");

• Hello Karel

• HelloKarel

• Hello

  Karel

• error

What will the following code print?

int n = 5;

n ++;

n ++;

n += n;

System.out.println(n);

• 12

• 40

• 14

• 18

Which of the following would equal 2?

I.

int x = 0;

x ++;

x += x;

II.

int y = 4;

y ++;

y /= 2;

III.

int z = 4;

z += 2;

z /= 2;

• I only

• II only

• III only

• I and II only

• I, II, and III

The following code is intended to print 8.

int x = 23;

double y = 3;

System.out.println((int)(x / y));

What is printed and why?

• 7 because the values of x and y are integers so 23 / 3 evaluated to 7

• 7 because x / y calculates to 7.66 then the cast to an int results in the value getting truncated to 7

• 8 because the values of x and y are integers so 23 / 3 evaluated to 8

• 8 because x / y calculates to 7.66 then the cast to an int results in the value getting rounded up to 8

What will the output of the following lines of code be?

int x = 10;

int y = x / 4;

System.out.print("x + y = ");

System.out.print(x + y);

• x + y = 12

• x + y =

  12

• x + y = 12.5

• x + y =

  12.5

• x + y = 102

Which of the following print:

Hello Java!

I.

System.out.println("Hello Java!");

II.

System.out.print("Hello Java!");

III.

System.out.print("Hello");

System.out.print("Java!");

IV.

System.out.println("Hello");

System.out.println("Java!");

• I and II only

• I, II, and III only

• I and III only

• I, II, and IV only

• I, II, III, and IV

How many lines will be printed with the following statement?

System.out.println("Hello");

System.out.println(" World");

System.out.print("Welcome to");

System.out.print("Java.");

• 1

• 2

• 3

• 4