#include <stdio.h>

int main()
{
    int a[10];
    extern void setsquares(int *a);

    setsquares(a);
    printf("three squared is %d\n", a[3]);

    return 0;
}

void setsquares(int *a)
{
    int i;
    for (i = 0; i < 10; i++)
        a[i] = i * i;
}