text: #include <QCoreApplication>
  #include <iostream>
  using namespace std;
  int main(int argc, char *argv[])
  {
      QCoreApplication a(argc, argv);
  
      cout << 5. << '\n';
      cout << .5 << '\n';
      cout << 5E1 << '\n';
      cout << 5E-1 << '\n';
      cout << 1'000 << "\n"; // C++14 feature
  
      return a.exec();
  }
  