accessing elements 2D array using pointers

Code Example 1

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