array test2 in c language

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int arr[4]={2,4,8,1},i=4,j;

     printf ("arr[0]=%d\n",arr[0]);
     printf ("arr[1]=%d\n",arr[1]);
     printf ("arr[2]=%d\n",arr[2]);
    printf ("arr[3]=%d\n",arr[3]);
    printf ("arr[4]=%d\n",arr[4]);  //garbage values

    while(i)
    {
        j=arr[i]+i;
        i--;
    }
    printf ("j=%d\n",j);
   
    return 0;
}