AP CSA Unit 3

What does short circuit evaluation mean in the following code?

i) if (a < b && c != d)

• if a < b is false it evaluates c != d

• if a < b is false it doesn't evaluate c != d

• if c != d is false it evaluates a < b

• f c != d is false it doesn't evaluate a < b

• if a < b is true it doesn't evaluate c != d

Which if statement below tests if the variable letter holds the char value #?

• if (letter == #)

• if (letter == "#")

• if (letter == '#')

• if (letter >= '#')

• if (letter = '#')

Consider the following code:

int a [] = {2, 6, 8, 10, 12, 14, 16, 18};

int sum = 0;

for (int i = 0; i < a.length; i++) {

if (a[i]%3 == 0)

sum += a[i];

}

System.out.println(sum);

What is output?

• 20

• 26

• 28

• 36

• 38

What is output by the following code?

for (int i = 0; i < 5; i++)

System.out.print(i + " ");

• 0 1 2 3 4 5

• 0 1 2 3 4

• 1 2 3 4

• 1 2 3 4 5

• 1 2 3 4 5 6

Which of the following would print the numbers, 32 54 76 98?

I. for (int t = 32; t <= 100; t += 22)

System.out.print(t + " ");

II. int t = 10;

while (t < 90) {

t += 22;

System.out.print(t + " ");

}

III. int t = 32;

while (t < 100) {

t += 22;

System.out.print(t + " ");

• I only

• II only

• III only

• I and II only

• I, II, and III

Assume that x and y are boolean variables and have been properly initialized.

(x && y) && !(x || y)

Which of the following best describes the result of evaluating the expression above?

• Always true

• Always False

• true only when x is true and y is true

• true only when x and y have the same value

• true only when x and y have different values

Consider the following boolean statement:

!( x > y && w == z )

Which of the following will produce the same result?

• x <= y && w == z

• x >= y || w != z

• x <= y || w != z

• x <= y && w != z

• x < y && w != z

What is 0 0 1 1 1 0 0 0 in base ten?

• 54

• 55

• 56

• 57

• 58

What is 67 in binary?

• 0 1 0 0 0 0 1 0

• 0 1 0 0 0 0 1 1

• 0 1 0 0 0 1 1 0

• 0 1 0 0 0 1 1 1

• 0 1 0 0 1 1 1 0

Consider the following code:

String q = "power";

String r = "brown";

System.out.println(q.charAt( r.indexOf('n')));

What is output?

• 2

• 3

• e

• r

• w