2 Dimensional Array

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

• int matrix(3,4);

• int matrix[3][4];

• int matrix{3,4};

• int matrix(3)[4];

How can you access the element in the second row and third column of the matrix
int matriz[3][3];?

• matriz[2][3]

• matriz[1][2]

• matriz[3][2]

• matriz[2][1]

What is the output of the following code?
int matrix[2][2] = { {1, 2}, {3, 4} };
printf("%d", matrix[1][0]);

• 1

• 2

• 3

• 4

How is a 2D array stored in memory?

• Column-major order

• Row-major order

• Random memory allocation

• Stored separately in different locations

What will happen if you try to access matrix[3][2] in
int matrix[3][3];?

• It will return garbage value

• It will give a segmentation fault

• It will return 0

• It will run normally

What is the correct way to iterate over a 3×3 matrix?

• for(int i=0; i<3; i++)
  for(int j=0; j<3; j++) printf("%d ", matrix[i][j]);

• for(int i=0; i<3; j++) for(int j=0; i<3; i++) printf("%d ", matrix[i][j]);

• for(int i=0; i<=3; i++) for(int j=0; j<=3; j++) printf("%d ", matrix[i][j]);

• for(int i=1; i<=3; i++) for(int j=1; j<=3; j++) printf("%d ", matrix[i][j]);

Which of the following correctly initializes a 3×3 matrix with zero values?

• int matrix[3][3] = {0};

• int matrix[3][3] = {{0}};

• int matrix[3][3] = { {0,0,0}, {0,0,0}, {0,0,0} };

• All of the choices

What does the following code output?
int matrix[2][3] = { {1, 2, 3}, {4, 5, 6} };
printf("%d", matrix[0][2] + matrix[1][0]);

• 3

• 5

• 7

• 9

How do you swap the first and last row of a 3x3 matrix in C?

• By reassigning elements using a loop

• Using the swap() function in C

• Using the sort() function

• 9It is not possible

In a 2D array, elements are stored in column-major order in C.

• True

• False

Answer explanation

C stores 2D arrays in row-major order (left to right, top to bottom).