#include <stdio.h>

int main() {
    int *ptr;
    int arr[5] = {0,1,2,3,4};
    int arrr[5] = {5,6,7,8,9};
    ptr = arr;
    printf("%d\n", ptr[3]);
    ptr = arrr;
    printf("%d\n", ptr[3]);
    //arr = ptr;
}