long long signed_poly (long long sum, long x) { sum += (long long) (long) sum * (long long) x; return sum; } unsigned long long unsigned_poly (unsigned long long sum, unsigned long x) { sum += (unsigned long long) (unsigned long) sum * (unsigned long long) x; return sum; } int main (void) { if (signed_poly (2LL, -3) != -4LL) abort (); if (unsigned_poly (2ULL, 3) != 8ULL) abort (); exit (0); }