APCSA Unit 3 Review - Assessment

1.

Multiple Choice

30 sec

1 pt

Consider the code segment below

What is printed as a result?

int x = 10;

int y = 20;

System.out.print(y + x / y);

1

1.5

3

20

20.5

Answer explanation

ORDER OF OPERATIONS!!!

Division (INTEGER DIVISION) happens FIRST!

2.

Multiple Choice

30 sec

1 pt

Which of the following expressions evaluates to 1?

1. 2 / 5 % 3

2. 2 / (5 % 3)

3. 2 / 5 + 1

1 only

2 only

1 and 2 only

2 and 3 only

1, 2, and 3

Answer explanation

Divided by (/) and mod (%) have the same level of importance, so without parentheses we do them from left to right

3.

Multiple Choice

30 sec

1 pt

Consider the following:

int a = 2;

int b = 6;

int c = 3;

Which of the following expressions evaluates to false?

a < b == c < b

a > b == b < c

a < b != c < b

4.

Multiple Choice

30 sec

1 pt

Consider the following code segment

boolean a = true;

boolean b = true;

System.out.print((b || (!a || b)) + " ");

System.out.print(((!b || !a) && a) + " ");

System.out.println(!(a && b) && b);

true false false

true true true

true false true

false true false

5.

Multiple Choice

30 sec

1 pt

Consider the following code segment.

String str1 = new String("Happy");

String str2 = new String("Happy");

System.out.print(str1.equals(str2) + " ");

System.out.print(str2.equals(str1) + " ");

System.out.print(str1 == str2);

What is printed as a result of executing the code segment?

true true true

true true false

false true false

false false true

6.

Multiple Choice

30 sec

1 pt

Consider the following code segment, which is intended to store the sum of all multiples of 10 between 10 and 100, inclusive (10 + 20 + ... + 100), in the variable total.

int x = 100;

int total = 0;

while( /* missing code */ )

{

total = total + x;

x = x - 10;

}

Which of the following can be used as a replacement for /* missing code */ so that the code segment works as intended?

x < 100

x <= 100

x > 10

x >= 10

7.

Multiple Choice

30 sec

1 pt

Consider the following code segment.

int a = 1;

String result = "";

while (a < 20)

{

result += a;

a += 5;

}

System.out.println(result);

What, if anything, is printed as a result of executing the code segment?

21

161116

161161

Nothing is printing because of an infinite loop.

8.

Multiple Choice

30 sec

1 pt

Consider the following code segment.

int count = 0;

int number = 20;

while (number > 0)

{

number = number / 2;

count++;

}

What will be the value of count after executing the code segment?

6

5

4

1

9.

Multiple Choice

30 sec

1 pt

Consider the following code segment.

String word = "Computer";

int num = 3;

String result = "";

for (int k = num; k >= 0; k--)

{

result += word.substring(0, k);

}

System.out.print(result);

What is printed as a result of executing the code segment?

comcoc

ccocom

ccocomcomp

comcomcomcom

10.

Multiple Choice

30 sec

1 pt

Consider the following code segment.

int a = 100;

while (a > 1)

{

System.out.println("$");

a /= 2;

}

How many $’s are printed as a result of executing the code segment?

0

5

6

7

50

11.

Multiple Choice

30 sec

1 pt

Consider the following code segment.

String str = "AP";

str += "CS " + 1 + 2;

System.out.println(str);

What is printed as a result of executing the code segment?

CS AP12

AP CS3

CSAP 12

APCS 12

APCS 3

12.

Multiple Choice

30 sec

1 pt

Consider the following code segment.

String one = "ABC123";

String two = "C";

String three = "3";

System.out.println(one.indexOf(two));

System.out.println(one.indexOf(three));

System.out.println(two.indexOf(one));

What is printed when the code segment is executed?

2

5

-1

2

5

2

6

-1

2

13.

Multiple Choice

30 sec

1 pt

The code segment below is intended to randomly print one of the values 2, 4, 6, or 8 with equal probability.

int val = /* missing code */ ;

val *= 2;

System.out.print(val);

Which of the following can be used to replace /* missing code */ so that the code segment works as intended?

Math.random() * 4 + 1

Math.random() * 4

(int) (Math.random() * 4)

(int) (Math.random() * 4 + 1)

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