CSA Array Unit Test

Which index is the last element in an array called nums at?

• nums.length

• nums.length - 1

• nums.length + 1

• nums.length / 2

Which of the following declarations will cause a compile time error?

• int[] scores = null;

• int[] scoreArray = {50, 90, 85};

• String[] nameArray = new String[10];

• String[] nameArray = {5, 3, 2};

• int[] scores = new int[5];

What is returned from arr[3] if arr={6, 3, 1, 2}?

• 1

• 2

• 3

• 6

• 4

What is returned from mystery when it is passed (10, 30, 30, 60)?

• 17.5

• 30.0

• 130

• 32.5

Given the following values of a and the method doubleLast, what will the values of a be after you execute: doubleLast()?

• {-20, -10, 2, 8, 16, 60}

• {-20, -10, 2, 4, 8, 30}

• {-10, -5, 1, 8, 16, 60}

• {-10, -5, 1, 4, 8, 30}

What are the values in a after multAll(3) executes?

• {1, 3, -5, -2}

• {3, 9, -15, -6}

• {2, 6, -10, -4}

• The code will never stop executing due to an infinite loop

Consider the following code segment. Which of the following statements best describes the condition when it returns true?

• Whenever the first element in a is equal to val

• Whenever a contains any element which equals val

• Whenever the last element in a is equal to val

• Whenever more than 1 element in a is equal to val

• Whenever exactly 1 element in a is equal to val

Consider the following data field and method findLongest. Method findLongest is intended to find the longest consecutive block of the value target occurring in the array nums; however, findLongest does not work as intended. For example, given the code below, the call findLongest(10) should return 3, the length of the longest consecutive block of 10s. Which of the following best describes the value actually returned by a call to findLongest?

• It is the length of the shortest consecutive block of the value target in nums

• It is the length of the array nums

• It is the length of the first consecutive block of the value target in nums

• It is the number of occurrences of the value target in nums

• It is the length of the last consecutive block of the value target in nums

Consider the following data field and method. Which of the following best describes the contents of myStuff in terms of m and n after the following statement has been executed?

• All values in positions m+1 through myStuff.length-1 are greater than or equal to n.

• All values in position 0 through m are less than n

• All values in position m+1 through myStuff.length-1 are less than n.

• The largest value that is smaller than n is at position m.

• The smallest value is at position m

Consider the following field arr and method checkArray. Which of the following best describes what checkArray returns?

• Returns the index of the largest value in array arr.

• Returns the index of the first element in array arr whose value is greater than arr[loc].

• Returns the index of the last element in array arr whose value is greater than arr[loc].

• Returns the largest value in array arr.

• Returns the index of the largest value in the second half of array arr.