Passing implicitly sized array.

#include "cstdio"

void print_arr(int arr[]);

int main() {

    int arr[] = {1,2,3,4,5,6,7};
    print_arr(arr);

    printf("\n\n%lu", sizeof(arr)/sizeof(int));
    return 0;

}


void print_arr(int *arr) {

for (int i= 0; *(arr+i) != NULL; i++) {
    printf("%d ", *(arr+i));
}

printf("\n\n%lu", sizeof(arr)/sizeof(int));

}