W3Schools Tryit 编辑器 - W3Schools 中文教程

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

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

// Hexadecimal and octal numbers
  cout << "\nHexadecimal and octal numbers\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);

// Floating point numbers
  cout << "\nFloating point numbers\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";

// Alignment
  cout << "\nAlignment\n";
  cout.setf(ios::left, ios::adjustfield);
  cout << setw(10) << "Left" << "\n";
  cout.setf(ios::right, ios::adjustfield);
  cout << setw(10) << "Right" << "\n";
  cout.setf(ios::internal, ios::adjustfield);
  cout << setw(10) << 12345.0 << " (Internal)\n";
  return 0;
}