Function randint

code/mathematics/fastmul.test.cpp:2–9

intx randint(int len) {
  stringstream ss;
  ss << rng() % 9 + 1;
  for (int i = 0; i < len-1; i++)
    ss << rng() % 10;

  return intx(ss.str());
}

void test() {
  /* Field testing: SPOJ {MUL,TMUL,VFMUL} */