std::cout输出十六进制数据

std::vector<uint8_t> data{0x11, 0x22, 0x33, 0x99, 0xff};
  std::ofstream ofs("test.txt", std::ios::app);
  for (int i = 0; i < data.size(); i++)
  {
    std::cout << std::hex << (int)data[i] << " ";
  }
  std::cout << std::endl;
  for (int i = 0; i < data.size(); i++)
  {
    std::cout << std::hex << (int)data[i] << " ";
  }
  std::cout << std::endl;