2D Array in C++ Quiz

What is a 2D array in C++?

• An array of functions

• An array of strings

• An array of arrays

• A pointer to a pointer

How do you declare a 2D array with 3 rows and 4 columns of integers?

• int arr[3,4];

• int arr(3,4);

• int arr[3][4];

• int arr{3}{4};

What is the index of the first element in a 2D array?

• [0][1]

• [1][0]

• [0][0]

• [1][1]

Which of the following correctly accesses the element in the second row and third column?

• arr[2][3]

• arr[1][2]

• arr[3][2]

• arr[2][1]

Which loop structure is commonly used to traverse a 2D array?

• Single for loop

• While loop

• Nested for loops

• Switch case

If int arr[2][3] = { {1, 2, 3}, {4, 5, 6} }; what is the value of arr[1][2]?

• 3

• 4

• 5

• 6

What is the output of the following code? int arr[2][2] = { {1, 2}, {3, 4} }; cout << arr[0][1];

• 1

• 2

• 3

• 4

In C++, a 2D array must have the number of columns specified at declaration.

• True

• False

2D arrays can only store integers.

• False

• True

You can access a 2D array element using a single index like arr[3].

• True

• False