int main(void) {

    int size = 10;

    int grades[size];

    int * arrptr;

    int i = 0;

    arrptr = grades; // same as arrptr = &grades[0];

    for (i = 0; i < size; i++) {

        grades[i] = i;

    }

 

    for (arrptr = grades, i = 0; arrptr < grades + size; arrptr++, i++) {

        printf("value at %d is %d\n", i, *arrptr);

    }

 

 

    *(arrptr + 3) = 28; // same as grades[3] = 28;

    printf("value at index 3 is %d\n", *(arrptr+3));

    return 0;