Row-major order is the most common way to store a matrix in memory. In row-major order, the elements of each row are stored in contiguous memory locations, and the rows themselves are also stored in contiguous memory locations.

To create and access a matrix in row-major order in C, you can use a two-dimensional array. Here is an example code that creates a 3x3 matrix in row-major order:

```c
#include <stdio.h>

#define ROWS 3
#define COLS 3

int main() {
    int matrix[ROWS][COLS] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};

    // accessing elements of the matrix
    printf("Element at (1, 2) = %d\n", matrix[1][2]); // prints 6
    printf("Element at (2, 0) = %d\n", matrix[2][0]); // prints 7

    return 0;
}
```

In this code, we have defined a matrix with 3 rows and 3 columns using a two-dimensional array `matrix[ROWS][COLS]`. The elements of the matrix are initialized with initial values using the double braces notation.

To access the elements of the matrix, we use the indices of the desired element. In row-major order, the row index comes first, followed by the column index. So, `matrix[1][2]` represents the element at row 1 and column 2, which has a value of 6.

Similarly, `matrix[2][0]` represents the element at row 2 and column 0, which has a value of 7. The output of the program will be:

```
Element at (1, 2) = 6
Element at (2, 0) = 7
```

Note that the elements of the matrix are stored in contiguous memory locations in row-major order, which means that the memory address of each element can be calculated using the formula described in the previous answer.

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