正整数转string型

//正整形转换为string型
string FNumChangeCString(int i)
{
  //序号
  string SerialNumber;
  SerialNumber.resize(0);
  if (i < 0)
  {
    return SerialNumber;
  }
  if (i == 0)
  {
    SerialNumber.push_back('0');
    return SerialNumber;
  }
  //余数
  int Remainder = 0;
  while (i != 0)
  {
    Remainder = i % 10;
    SerialNumber.push_back(Remainder + '0');
    i = i / 10;
  }
  size_t Size = SerialNumber.size();
  size_t size = Size / 2;
  char temp;
  for (size_t i = 0; i < size; i++)
  {
    temp = SerialNumber[i];
    SerialNumber[i] = SerialNumber[Size - i - 1];
    SerialNumber[Size - i - 1] = temp;
  }
  return SerialNumber;
}