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CSA unit 5 Flashcards | StudBud

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What does arr.length return in a 2D array?

Which is the correct way to initialize a 2D array?

CSA unit 5

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Answers

1
Which is the correct way to initialize a 2D array?
int[][] arr = new int[3][3];
array arr = new array[3][3];
int[][] arr = new int[3,3];
int arr = new int[3][3];
2
What does arr.length return in a 2D array?
The total number of elements
The number of dimensions
The number of columns
The number of rows
3
How do you access the element in the second row and third column?
arr[1,2]
arr[2][3]
arr[3][2]
arr[1][2]
4
What type of loop is commonly used to traverse a 2D array?
Nested for loops
Switch statements
Single for loop
While loops
5
Which is a valid enhanced for loop for a 2D array?
for(int[] val : arr) { for(int row : val) { } }
for(int row : arr) { for(int val : row) { } }
for(int row, val : arr) { }
for(int[] row : arr) { for(int val : row) { } }
6
What does arr[0].length return in a 2D array?
The total number of elements
The total number of rows
The number of columns in the first row
The index of the first element
7
What will happen if you try to access arr[5][2] in a 4x4 array?
Creates a new row
Returns null
Returns 0
ArrayIndexOutOfBoundsException
8
What is row-major traversal?
Traversing column by column
Traversing row by row
Looping diagonally
Randomly accessing elements
9
Which of these movies is NOT about artificial intelligence?
Lion King
Terminator
Wall-E
The Matrix
10
What is a two-dimensional array?
A stack of stacks
A one-dimensional array
A list of lists
An array of arrays