W3School TIY Editor

#include <iostream>
#include <iomanip>
using namespace std;

int main() {
  // 布尔值
  cout << "布尔值\n";
  cout << false << "\n";
  cout.setf(ios::boolalpha);
  cout << false << "\n";

// 十六进制和八进制数
  cout << "\n十六进制和八进制数\n";
  int myInt = 14;
  cout << myInt << "\n";
  cout.setf(ios::hex, ios::basefield);
  cout << myInt << "\n";
  cout.setf(ios::oct, ios::basefield);
  cout << myInt << "\n";
  cout.setf(ios::showbase);
  cout.setf(ios::uppercase);
  cout.setf(ios::hex, ios::basefield);
  cout << myInt << "\n";
  cout.setf(ios::oct, ios::basefield);
  cout << myInt << "\n";
  cout.setf(ios::dec, ios::basefield);

// 浮点数
  cout << "\n浮点数\n";
  float myFloat = 19.99;
  cout << myFloat << "\n";
  cout.setf(ios::fixed, ios::floatfield);
  cout << myFloat << "\n";
  cout.setf(ios::scientific, ios::floatfield);
  cout << myFloat << "\n";
  cout.unsetf(ios::floatfield);
  cout.setf(ios::showpos);
  cout.setf(ios::showpoint);
  cout << 12345.0 << "\n";

// 对齐方式
  cout << "\n对齐方式\n";
  cout.setf(ios::left, ios::adjustfield);
  cout << setw(10) << "左对齐" << "\n";
  cout.setf(ios::right, ios::adjustfield);
  cout << setw(10) << "右对齐" << "\n";
  cout.setf(ios::internal, ios::adjustfield);
  cout << setw(10) << 12345.0 << " (内部对齐)\n";
  return 0;
}