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User: Ditmar Wendt
In Course: Adv Pl Computer Science A V9 ( 2993)
Instructor: Lisa Lagrew Brock

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06.05 Challenge Exam 2 (Part 1)

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Question 1 (Multiple Choice Worth 2 points)

!((x > y) || (y <= 0)) is equivalent to which of the following expressions?

I.!(x > y) || !(y <= 0)
II.!(x > y) &&! (y <= 0)
III. (x <= y) && (y > 0)

I only

II only

III only

I and III only

II and III only

Question 2 (Multiple Choice Worth 2 points)

What does the decimal number 143 equal in the hexadecimal system?

8F

C4

7A

131

3D

Question 3 (Multiple Choice Worth 2 points)

Under which of the following conditions must the boolean expression have the value
true where n represents the length of a?

((i <= n) && (a[i] == 0)) || (((i >= n) && (a[i-1] == 0)))

(i <= n) || (i >= n)

(a[i] == 0) && (a[i-1] == 0)

i == n

i < n

i > n

Question 4 (Multiple Choice Worth 2 points)

Assume that these String variables have been declared:

String str1 = new String("fred");
String str2 = new String("Fred");
What is the value of the following expression?
str1.equals(str2);

true

false

fred

equal

fred.equals(Fred)

Question 5 (Multiple Choice Worth 2 points)

What is output by the following code fragment?

String[ ] veggies = { "zucchini", "carrot", "spinach", "asparagus" };

int i = 0;

for (String item : veggies) {

i += item.length();

}

System.out.println(i);

26

27

28

29

30

Question 6 (Multiple Choice Worth 2 points)

If String str1 = "Forest" and String str2 = "School", then what is the value of
str1.compareTo(str2);?

-1

a value less than 0

0

1

a value greater than 0

Question 7 (Multiple Choice Worth 2 points)

Suppose the following array is declared:

int[ ] grades = {88, 92, 95, 83};
What is the value of grades[2]?

An ArrayIndexOutOfBoundsException occurs

88

92

95

83

Question 8 (Multiple Choice Worth 2 points)

What does the binary number 1001 represent in the decimal system?

11

9

17

15

23

Question 9 (Multiple Choice Worth 2 points)

The following code is designed to set index to the location of the first occurrence
of target in the array a, and to set index to -1 if target is not found in a.

index = 0;
while (a[index] != target) {
index++;
}
if (a[index] != target){
index = -1;
}
Which of the following describes the condition under which this program segment will
fail to perform the task described?

Whenever target is the first element of the array

Whenever target is the last element of the array

Whenever target is not present in the array

Whenever target is -1

Whenever target = a[target]

Question 10 (Multiple Choice Worth 2 points)

Which of the following statements is true?

For-each loops (or enhanced for loops) cannot be used to iterate over arrays.

For-each loops can only be used to iterate over all array elements.

For-each loops can be used to iterate over all array elements in reverse order.

For loops cannot be used to iterate over all array elements in reverse order.

For-each loops cannot be rewritten as for loops.

Question 11 (Multiple Choice Worth 2 points)

Suppose the following array is declared:

int[ ] grades = {88, 92, 95, 83};

What are the values in grades after the following code executes?

int temp = grades[0];

grades[0] = grades[1];

grades[1] = temp;

An ArrayIndexOutOfBoundsException occurs

{92, 88, 95, 83}

{88, 88, 95, 83}

{92, 92, 95, 83}

{88, 92, 95, 83}

Question 12 (Multiple Choice Worth 2 points)

Suppose the following array is declared:

int[ ] grades = {88, 92, 95, 83};

What is the value of grades[grades[0] / 22]?

An ArrayIndexOutOfBoundsException occurs

4

88

92

95

Question 13 (Multiple Choice Worth 2 points)

What is printed by this code segment?

String s = "Howdy";
int i = s.length() - 1;
String total = "";
String letter;

while (i >= 0)
{
    letter = s.substring (i, i + 1);
    System.out.print (i + " " + letter + " ");
    total = total + letter;
    i--;
    }

4 H 3 o 2 w 1 d 0 y

0 H 1 o 2 W 3 d 4 y

4 y 3 d 2 w 1 o 0 H

0 y 1 d 2 w 3 o 4 H

0 1 2 3 4 H o w d y

Question 14 (Multiple Choice Worth 2 points)

The following code is intended to calculate the sum of the first five positive even
integers.

int sum = 2, k;

for(k = 4; k <= 12; k += 2)

{

sum += k;

}

What is wrong with this code segment?

The segment calculates the sum of the first four positive even integers.

The segment calculates the sum of the first six positive even integers.

The segment calculates the sum of the first seven positive even integers.

The variable sum is incorrectly initialized. The segment would work correctly if sum
was initialized to 0.

The segment works as intended.

Question 15 (Multiple Choice Worth 2 points)

Assume that a is an array of two or more integers, and that b and c are integers.

What is the result of the following code?
c = 0;
b = 1;
if (a.length > 0) {
c = a[0];
}
while (b < a.length){
if (a[b] < c) {
c = a[b];
}
b++;
}

b contains the highest value in the array

b contains the lowest value in the array

c contains the highest value in the array

c contains the lowest value in the array

An endless loop occurs

Question 16 (Multiple Choice Worth 2 points)

Given the following code:

if (n == 2)
{
    k -= 2;
    }
    else if (n == 3)
    {
    k -= 3;
    }

    can be rewritten as:

    if (< condition >) {
    < assignment statement >;
    }

    Assume that evaluating < condition > does not change the values stored in n and k. Which
    of the following could be used as < assignment statement >?

k -= n;

k -= 1;

k -= 2;

k += n;

k = n – k;

Question 17 (Multiple Choice Worth 2 points)

Consider the following code segment:

int i;
for (i = 0; i <= 10; i++) {
if ((i % 3) == 1) {
System.out.print(i + " ");
}
}
What is printed as a result of executing this code segment?

1 2 3 4 5 6 7 8 9 10

1 3 5 7 9

1 3 7 9

1 4 7

1 4 7 10

Question 18 (Multiple Choice Worth 2 points)

Suppose the following array is declared:

int[ ] grades = {88, 92, 95, 83};
and the following integer is declared:
int index = 1 + 6 % 3;
What is the value of grades[index]?

An ArrayIndexOutOfBoundsException occurs

88

92

95

83

Question 19 (Multiple Choice Worth 2 points)

Given the following code:

int i = 100;
int j = 10;
while (i > 0)
{
i = i / j;
j = 1 + j % 5;
}
What is the value of i after this code executes?

0

1

2

5

10

Question 20 (Multiple Choice Worth 2 points)

Consider the following code, What are the values in array after the following code executes?

int[ ] array = new int[3];
int index = 1;
array[index] = index - 1;
index++;
array[index] = array[index - 1] - 1;
array[index - 2] = index % 3;

{0, 0, 0}

{0, 0, 2}

{2, 0, 0}

{2, 0, -1}

{3, 0, 2}

Question 21 (Multiple Choice Worth 2 points)

If a, b, and c are boolean variables such that a is true, b is false, and c is true,
which of these expressions:

I.!((a || b) && c)
II.!a && (b && c)
III.!a && (b || c)
evaluates to false?

I only

II only

III only

II and III only

I, II, and III

Question 22 (Multiple Choice Worth 2 points)

What is output by the following program?

int i = 6;
while (i >= 2) {
System.out.print (i + " ");
if ((i % 2) == 0) {
i = i / 2;
} else {
i = i + 1;
}
}

6 7 4 2

6 3 4 2

6 2 4 1

6 5 4 3 2

6 3 5 2

Question 23 (Multiple Choice Worth 2 points)

Consider the following two code segments. In both, assume that n is an integer
variable that has been declared and initialized.

Segment 1

int prod = 1;

int i;

for (i = 2; i <= n; i++) {

prod *= i;
}

System.out.println(prod);

Segment 2

int prod = 1;

int i = 2;

while (i <= n) {

prod = prod * i;

i++;

}

System.out.println(prod);

For which integer values of n do these code segments print the same result?

Only n > 1

Only n < 1

Only n == 1

Only n >= 1

Any integer n produces the same result

Question 24 (Multiple Choice Worth 2 points)

In the following algorithm, which constant should be assigned to maximum to ensure that the algorithm finds the largest integer?

maximum = <<constant>>;for(int current = 0; current < numbers.length; current ++){if (maximum < numbers[current])maximum = numbers[current];}

Int.MIN_VALUE

Int.MAX_VALUE

Integer.MAX_VALUE

Integer.MIN_VALUE

Question 25 (Multiple Choice Worth 2 points)

Assume that age has been declared as an int variable. Which expression is true
whenever age indicates that the person is a teenager?

((age < 20) && (age >= 13))

((age < 20) || (age >= 13))

((age <= 19) && (age < 13))

((age <= 19) || (age >= 13))

((age <= 19) && (age >= 12))

Question 26 (Multiple Choice Worth 2 points)

The Integer.MIN_VALUE constant has the value of ____.

-231

-231 - 1

-231 - 1

-231 + 1

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