Intro to Java Day 17 Homework

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Remember that arrays have zero-based indexing!

Email *

Record my email address with my response

What is printed out by this code segment? *

1 point

Nothing, there is an error

What are the contents of the array arr after this code is run? *

1 point

[0, 0, 0]

[1, 0, 0]

[0, 1, 0]

There is an error

What is printed out by this code segment? *

1 point

Nothing, there is an error

What does the following code snippet do? Assume that arr is a properly declared and initialized int array.
*

1 point

The first value and last value of the array are switched

The first and last values of the array are both set to the first value

The first and last values of the array are both set to the last value

Array out of bounds error

Is this a proper way to find the sum of all odd numbers in arr? *

1 point

No, we won't be able to access sum outside of the if statement

No, arr[i] % 2 == 1 should be replaced by arr[i] % 2 == 0

Yes, the sum will be stored in the variable sum after the for loop is run

Yes, but the sum will be stored in arr[i], not the variable sum

What does the following code snippet do? Assume that arr is a properly declared and initialized int array.
*

1 point

mystery stores the sum of the first row of arr

mystery stores the sum of the first column of arr

mystery stores the sum of the diagonal of arr

mystery stores the sum of all elements with an index of zero

How would we change the following code snippet so that it switches the first and second values of the array instead?
*

1 point

Replace arr.length - 1 with 1

Replace arr.length - 1 with 2

Replace 0 with 1

Replace 0 with 2

Programming Question

Write a program that inverts a 2D array. Inverting a 2D array means that each row of the 2D array is now a column, and each column is now a row.

Sample input

1 1 1
2 2 2
3 3 3

Sample output

1 2 3
1 2 3
1 2 3

1 point

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