std :: hex 및 std :: oct 플래그가 작동하지 않는 이유는 무엇입니까?

이것은 내 코드입니다.

// This program demonstrates the use of flags.

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main()
{
  string filename; bool tf; double number;

  cout << "Name a file to create/overwrite: ";
  cin >> filename;

  ofstream outfile (filename.c_str());

  if(outfile.fail())
  {
    cout << "Creating/Overwriting the file has failed.\nExiting...\n";
    return 1;
  }

  cout << "Give me a boolean (0/1): "; cin >> tf;
  cout << "Give me a large number with decimal points: "; cin >> number;

  outfile.setf(ios_base::boolalpha); // Turns on boolalpha flag.
  outfile << "Here's a boolean: " << tf << endl;

  outfile.unsetf(ios_base::boolalpha); // Unsets boolalpha flag.
  outfile << "Here's your number: " << number << endl;

  outfile.setf(ios_base::scientific); // Turns on scientific notation flag.
  outfile << "Here's your number is scientific notation: " << number << endl;

  outfile.setf(ios_base::fixed); // When possible, floating point numbers will not appear in scientific notation.
  outfile << "Here's your number in fixed notation: " << number << endl;

  outfile.setf(ios_base::hex); // Numbers will appear in hexadecimal format.
  outfile << "Here's your number in hexadecimal format: " << number << endl;

  outfile.setf(ios_base::oct, ios_base::uppercase); // Numbers will appear in uppercase, octal format.
  outfile << "Here's your number in octal format: " << number << endl;

  return 0;
}

이걸 실행하면 ...

test.txt의 내용 :

Here's a boolean: false
Here's your number: 3491.67
Here's your number is scientific notation: 3.491670e+03
Here's your number in fixed notation: 3491.67
Here's your number in hexadecimal format: 3491.67
Here's your number in octal format: 3491.67

"hex"및 "oct"플래그를 설정할 때 왜 작동하지 않습니까?

텍스트 파일에서 "16 진수 형식 :"및 "8 진수 형식 :"옆에 "3591.67"이 아닌 다른 것을 예상했습니다.

플래그를 잘못 구현 했습니까?