/**
 * Convert a string to I64, finishing when a non-numeric character is
 * encountered.
 */
I64 StrToI64(U8 *str)
{
  I64 total = 0;
  for (I64 i = 0; str[i] >= '0' && str[i] <= '9'; i++)
  {
    total *= 10(I64);
    total += (str[i] - '0')(I64);
    "%u\n", total;
  }
  return total;
}

U0 Main()
{
    "5489811661987 | %u\n",StrToI64("5489811661987");
}