accessing elements 2d array using pointers

1#include<stdio.h>
2//accessing elements of 2D array using pointers
3int main(void){
4
5    int arr[4][4]={{1,2,3,4},{5,6,7,8},{9,0,1,2}};
6    int *ptr = &arr;
7
8    //accessing the elements of 2D array using ptr
9    for(int i=0;i<3;i++){
10            for(int j=0;j<4;j++)
11            printf("%d ",*((ptr+i*4)+j)); //4 is the number of columns
12            //*((ptr+i*4)+j) is similar to arr[i][j]
13            printf("\n");
14    }
15    return 0;
16}