All questions are independent of each other.

For the multiple choice questions (MC), enter the capital letter (sorry I got a lil bit lazy here) and click the submit button at the bottom when done to get your score

The free-response questions (FR) won't be graded, but answers will be provided

1) (MC) What will be printed out?

int bobsAge = 19;
int alicesAge = 25;
bobsAge = alicesAge;
alicesAge = 20;
System.out.println("Bob is " + bobsAge + " and Alice is " + alicesAge);

A. Bob is 19 and Alice is 25

B. Bob is 20 and Alice is 20

C. Bob is 25 and Alice is 20

D. Bob is 25 and Alice is 25

E. Bob is 19 and Alice is 20

2) (MC) What will be printed out?

int first = 11;
if (first < 0 || first > 10)
    first = 5;
first = 20;
System.out.println("First is " + first);

A. First is 11

B. First is 5

C. First is 20

3) (MC) Which is equivalent to the given code snippet?

if (first < 10 || first > 10) {
    first++;
}

if (first != 10) {
    first++;
}

if (first == 10) {
    first++;
}

if (first >= 10 && first <= 10) {
    first++;
}

D. None of these

4) (MC) What will be printed out?

for (int foo = 0; foo < 2; foo++) {
    for (int bar = 0; bar < 3; bar++) {
        System.out.println(foo + " " + bar);
    }
}

0 0
0 1
1 0
1 1
2 0
2 1

0 0
1 0
2 0
0 1
1 1
2 1

0 0
0 1
0 2
1 0
1 1
1 2

0 0
1 1
2 2

5) (FR) What are the types of each variable?

int value = 0;
String text = "Hey";
boolean test = false;

value is an int

text is a String

test is a boolean

Answer

6) (MC) What will be printed out?

int a = 1;
int b = 2;
int c = 3;
System.out.println(a+b+c+":"+a+(b+c));

A. 123:123

B. 123:15

C. 6:123

D. 6:15

E. 6:6

7) (FR) What is wrong with the following code?

int t = 3;
if (t == 3) {
    System.out.println("t is " + t);
    System.out.println("Hi");

System.out.println("Hey");

missing closing curly brace for if statement

Answer

8) (FR) What will be printed out?

int a = 6;
switch(a) {
    case 5:
        System.out.println("five");
    case 6:
        System.out.println("six");
    case 7:
        System.out.println("seven");
}

six

seven

Answer

9) (MC) Assume the user enters "Hello" when prompted, what will be printed out?

Scanner scanner = new Scanner(System.in);
String text = scanner.next();
if (text == "Hello") {
    System.out.println(text);
}
else {
    System.out.println("Goodbye");
}

A. There's no error, but nothing will be printed out

B. There's an error!

C. Hello

D. Goodbye

E. text

10) (FR) What is wrong with the following code?

int n = "Testing";
System.out.println(n);

n is an int but it is being given a String value

Answer

11) (MC) Assume a, b, c, and d are ints. Which expression does NOT give the same answer as the others?

A. a*b+c*d

B. (a*b+c*d)

C. a*(b+c)*d

D. (a*b)+(c*d)

12) (MC) What is the result of running the code?

int a = 6;
int b = 3;
a = b;
b = a;

A. a is equal to 6 and b is equal to 6

B. a is equal to 6 and b is equal to 3

C. a is equal to 3 and b is equal to 6

D. none of the above

13) (FR) What is wrong with the following code?

int x = 10;
if (x == 10);
    x--;
}

there's a semicolon after the if condition

missing an open curly brace after the if condition

Answer

14) (MC) What will be printed out?

int a = 5, b = 4, c = 3;
System.out.println(a + (b + c) + " = " + (a + b) + c);

A) 12=543

B) 12=93

C) 93=57

D) 93=543

E) None of these

15) (MC) What is the result of running the code?

int a = 6;
int b = 3 + a;
b = a + 3;
b = b + a;

A) a is equal to 6 and b is equal to 9

B) a is equal to 6 and b is equal to 18

C) a is equal to 9 and b is equal to 9

D) a is equal to 15 and b is equal to 15

E) a is equal to 6 and b is equal to 15

16) (MC) What will be printed out?

int b = 9;
b = b + (b = 3);
System.out.println(b);

A) 3

B) 6

C) 9

D) 12

E) There's an error!

17) (MC) What will be printed out?

int first = 11
int second = 13;
int third = 15;
System.out.println(first+1 + second+2 + third+3);

A) 45

B) 44

C) 40

D) 39

E) There's an error!

18) (MC) Assuming the user enters "yes" when prompted, what will be printed out?

Scanner s = new Scanner(System.in);
String choice = s.next();
if (choice.equals("Yes")) {
    System.out.println("Yay!");
}
else if (choice.equals("No")) {
    System.out.println("Nay!");
}
else {
    System.out.println("Huh?");
}

A) Nay!

B) Yay!

C) Huh?

D) There's an error!

E) There's no error, but nothing is printed out

19 (FR) What is wrong with the following code?

int a = 78;
int b = 907;
int a = b + a;
System.out.println(a);
System.out.println(b);

on the third line, we are declaring a variable called a, but a was already declared on the first line

the third line should be: a = b + a;

Answer

20) (MC) What will be printed out?

String a = "HEY THERE";
if (a.equalsIgnoreCase("heythere")) {
    System.out.println("Success!");
}
else if (a.equalsIgnoreCase("hey    there")) {
    System.out.println("Also Success!");
}

A) There's an error!

B) Success!

C) There's no error, but nothing is printed out

D) Also Success!

21) (MC) How many times is y printed out?

int y = 10;
while (y > 0) {
    if (y == 5) {
       continue;
    }
    System.out.println(y);
    y--;
}

A) 10

B) 5

C) There's no error, but nothing is printed out

D) 9

E) There's an infinite loop!

22) (MC) How many times is i printed out?

for (int i = 0; i < 20; i++) {
    if (i % 2 == 1) {
        continue;
    }
    System.out.println(i);
}

A) 10

B) 20

C) 18

D) 1

E) There's an error!

23) (FR) The program will ask the user to enter a number. If the number is between 7 and 10, the user will be asked if they want a prize. Then, if the user enters "yes", the program will print out, "Here's a cookie". If the user enters a number not between 7 and 10, the program will print out, "Bad guess. Better luck next time!". Will this code do what is being described above?

Scanner s = new Scanner(System.in);
int guess = s.nextInt();
String choice = "yes";

if (guess > 7 && guess < 10) {
    System.out.println("Good guess! Want a prize?");
    choice = s.next();
}
if (choice.equalsIgnoreCase("yes")) {
    System.out.println("Here's a cookie");
}
else {
    System.out.println("Bad guess. Better luck next time!");
}

yes and no

yes

if the user enters a number between 7 and 10 and then enters "yes", the program will print out, "Here's a cookie"

if the user enters a number that is not between 7 and 10, the program will print out, "Here's a cookie" (even though they entered a bad guess and weren't asked if they wanted a prize)
if the user enters a number between 7 and 10 and then enters something other than "yes", the program will print out, "Bad guess. Better luck next time!" (even though the user actually did enter a good guess)

one correct solution is:

Scanner s = new Scanner(System.in);
int guess = s.nextInt();
String choice = "yes";

if (guess > 7 && guess < 10) {
    System.out.println("Good guess! Want a prize?");
    choice = s.next();
    if (choice.equalsIgnoreCase("yes")) {
        System.out.println("Here's a cookie");
    }
}
else {
    System.out.println("Bad guess. Better luck next time!");
}

notice the position of the if statements

Answer

24) (MC) How many lines will be printed out?

for (int i = 0; i < 6; i++) {
    for (int j = 0; j < 4; j++) {
        System.out.println("Hi");
    }
}

A) There's an error!

B) 24

C) 10

D) 12

E) 35

25) (MC) What will be the last number printed out?

int k = 0;
for (int i = 0; i < 10; i+=2) {
    for (int j = 0; j < 5; j++) {
        k = k + 1;
        System.out.println(k);
    }
}

A) 15

B) 25

C) There's an error!

D) 50

E) 10

26) (FR) What are the different ways to change the code so that it results in an infinite loop?

int index = 0;
while (index < 10) {
    System.out.println("Boo");
    index++;
}

remove the index++ line

change the while condition to while (index >= 0) (or ≥ than some negative number)

add index-- (or decrease index by some amount)

add index = 0 (or set index equal to some amount < 10)

and other possibilities

Answer

27) (FR) Write a program that prints out all even numbers from 1 to 25 using a for loop and then prints out all odd numbers from 25 to 1 using a while loop. The even numbers should be space separated and all on one line. The odd numbers should be on a different line from the even numbers, but also space separated and all on one line. For example, the output should look like:
2 4 6 8 10 12 14 16 18 20 22 24
25 23 21 19 17 15 13 11 9 7 5 3 1

for (int i = 1; i < 25; i++) {
    if (i % 2 == 0) {
        System.out.print(i + " ");
    }
}
System.out.println();
int i = 25;
while (i > 0) {
    if (i % 2 == 1) {
        System.out.print(i + " ");
    }
    i--;
}

Answer

28) (FR) Is there anything wrong with this code?

Scanner s = new Scanner(System.in);
String text = s.next();
if (text == "yes") {
    System.out.println("yes");
}
else {
    System.out.println("no");
}

should not be using == to check for equality of Strings

Answer

29) (FR) Is there anything wrong with this code?

Scanner s = new Scanner(System.in);
int input = s.nextInt();
if (input = 5) {
    System.out.println("you entered 5");
}
else {
    System.out.println("you did not enter 5");
}

should not be using = to check for equality

Answer

30) Yay!