Array Basics in AP Computer Science A
If a programmer needs to process elements of an integer array from last-to-first, which looping construct could they use?
While-loop checking if current index isn't out-of-bounds.
Recursive function calling itself with next lower index until base case reached.
For-each loop starting with first index incrementally.
For-loop that decrements from last index down to zero.
Given the Java snippet below, how does the final value of x differ after executing the full sequence compared to the original code lacking the else part condition?
if(x % 4 == 0) { x += 10; } else { x /= 4; }
The final value of x increases more significantly, as it is only multiplied by multiples of four and reduced by a quarter each time, thereby altering the progression of steps taken towards the desired sum or total drastically.
The final value remains unchanged regardless of the presence or absence of additional conditional branching logic.
The final output depends solely on whether x meets the criteria for the division remainder tests, failing either leads to identical final sums or totals eventually.
If the test passes consistently throughout the iterations, then the multiplier used to augment x grows exponentially faster compared to the divisor used to diminish the rate of increase.
When debugging an algorithm that sums values in an integer array, what should you check first?
That method overloading is implemented correctly for different parameter types.
If your sum variable starts at zero before beginning traversal.
If multi-threaded processes are being used appropriately throughout your codebase.
Whether your program can perform arithmetic operations on double values as well.
What would be the outcome of using a for-each loop to find the maximum value in an array of integers?
The maximum value in the array is identified.
All values in the array are summed up.
The minimum value in the array is identified.
The average of all values in the array is calculated.
What value of X result in printing all elements of the array int[] nums using this code snippet? ' int x=_____;' ' WHILE ( x< NUMS.LENGTH) { SYSTEN.OUT.PRINTLN(NUMS[X++]); }
X=NUM.LENGTH;
X=-1;
X=NUM.LENGTH/2;
X=0;
If an array has four elements and we used the for loop header for (int i = 0; i <= 4; i++)
to traverse it, what is the result?
The loop will throw an ArrayIndexOutOfBoundsException.
The loop will only traverse through the first three elements of the array.
The loop will correctly traverse through all elements of the array.
The loop will only traverse through the first two elements of the array.
What does a standard for-loop look like when traversing backward through an int[] numbers starting at its last element?
i <= numbers.lenght-10;
for(int i = numbers.length - 1; i >= 0; i--)
int i = numbers.length;
i >= numbers.length;

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Which of the following correctly forward traverses every element of an array using a while loop?
java
int[] arr = {1, 2, 3, 4, 5};
int i = 1;
while (i <= arr.length) {
System.out.print(arr[i] + " ");
i++;
}
java
int[] arr = {1, 2, 3, 4, 5};
int i = arr.length - 1;
while (i >= 0) {
System.out.print(arr[i] + " ");
i++;
}
java
int[] arr = {1, 2, 3, 4, 5};
int i = arr.length - 1;
while (i >= 0) {
System.out.print(arr[i] + " ");
i--;
}
java
int[] arr = {1, 2, 3, 4, 5};
int i = 0;
while (i < arr.length) {
System.out.print(arr[i] + " ");
i++;
}
Which loop structure ensures checking all pairs in an int[] array for consecutive elements that sum up to an odd number without redundant checks?
While-loop starting at index length -1 decrementing by one
Single for-loop starting at index 1 incrementing by 1
Nested for-loops both starting at index 0
Single for-loop starting at index 0 incrementing by 2
How many times will the body of the following loop execute: int count=8; for(int i = count; i > 0; i++)
?
0 times
16 times
8 times
Once