unsigned long long f(unsigned long long[]);

/* hint: pointer arithmetic in C */
#define ERG (ar + 3)

unsigned long long ar[] = {5, 6, 7};
unsigned long long ar_copy[] = {5, 6, 7};
int j;
unsigned long long ret;

printf("adr of ar: 0x%016lx\n", ar);
for(j=0; j < sizeof ar / sizeof ar[0]; j++) {
	printf("ar[%i]: %d\n", j, ar[j]);
}
ret = f(ar);
printf("ret ist 0x%016lx (sollte 0x%016lx sein)\n", ret, ERG);
for(j=0; j < sizeof ar / sizeof ar[0]; j++) {
	printf("ar[%i]: %d\n", j, ar[j]);
}
RET(ret == (unsigned long long) ERG && ar[0] == ar_copy[0] * 30 && ar[1] == ar_copy[1] * 10 && ar[2] == ar_copy[2] * 20);