
AP CS A Unit 6 Quiz PRACTICE
Authored by Scott Chamberlain
Computers
9th - 12th Grade
Used 3+ times

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10 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Assume you have the following array: int[] num = {3, 2, 8, 1, 7}; How would you decrement (subtract) the second element in the array by one?
2--
1--;
num[1]--;
num[2]--;
num[1]++;
Answer explanation
The second element of num has index of 1 and the -- subtracts 1 from the value accessed by the []
2.
FILL IN THE BLANK QUESTION
2 mins • 1 pt
Consider the following code: double[] list = new double[25]; The index of the first value is ______ and the last index is ______.
Answer explanation
The first element of an array always has index 0, meaning that the 25th and final element of this array must have index 24, one less than the number of elements in the array.
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What data types can a standard array not hold?
ints
booleans
doubles
Strings
All the data types can be in a standard array
Answer explanation
All primitive data types + Strings can be stored in a standard array
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Consider the code shown here. What is output?
24
26
28
36
38
Answer explanation
The i % 2 == 0 will pick every even indexed value and then will sum them together, 2, 8, 12, 16 are those values and sum to 38
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Consider the following code, intended to search an array for a value and print the position where that value was found.
What could replace /* Missing Code */ so that the code works as intended?
number[i] = location;
location = numbers[i];
location = i;
i = location;
location = 1;
Answer explanation
In a linear search, we need to find the index in the array where the value we are searching for is stored. The missing code runs when we have found the value, so we need to store the index of that value in the found variable.
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The following is intended to count the number of times the number 100 is found in an array of test scores.
Which of the following could replace /* Missing Code */ so that the code works as intended?
tests[i] == 100
tests == 100
tests != 100
tests.equals(100)
tests[i].equals(100)
Answer explanation
The loop should check one value in the array on each pass through the loop, and check whether it is equal to 100.
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Consider the following code, intended to count the number of words in the array with a length greater than or equal to 5.
What could be used to replace /* Missing Code */ so that the code works as intended?
vocab.length[i]() >= 5
vocab[i].length() >= 5
vocab.length() > 5
vocab[i].length() > 5
vocab.length() >= 6
Answer explanation
The loop should check one value in the array on each pass through the loop, and check whether its length is greater than or equal to 5.
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