Multi-dimensional Array

Each element of multi dimensional array is an array. This is why it is called as array of arrays.

Syntax:
int arr[2][3];

int - datatype
arr - name of array.
2 - there will be two arrays inside this array.
3 - each array will have 3 elements.

int arr[2][3] = {{1,2,3}, {6,7,8}};

Access array elements

int arr[2][3] = {{1,2,3}, {6,7,8}};

    printf("%d ", arr[0][0]); 
    printf("%d ", arr[1][2]);

Here 1 is the second array and 2 is the third element in this array.

Change array values.

int main() {

    int arr[2][3] = {{1,2,3}, {6,7,8}};

    arr[0][2] = 7;
    arr[1][1] = 8;

    printf("%d", arr[0][2]);
    printf("%d", arr[1][1]);

    return 0;
}

Multidimensional array using for loop

#include <stdio.h>

int main() {

    int arr[2][3] = {{1,2,3}, {6,7,8}};

    for(int i=0; i<2; i++){
        for(int j=0; j<3; j++){
            printf("%d ", arr[i][j]);
        }
    }

    return 0;
}

First for loop for each arrays inside and the second for loop is for the elements inside each array.