QApplication value changing std :: to_string value

Qt seems to change the "interpretation" of the returned string std :: to_string (double). Example:

#include <iostream>
#include <QApplication>
#define VERSION 1.0
#define VSIZE 3

int main(int argc, char** argv) {
    std::string version = std::to_string(VERSION).substr(0, VSIZE);
    std::cout << version << std::endl; // everything fine

    QApplication app(argc, argv);

    std::cout << std::to_string(VERSION).substr(0, VSIZE); // no good
    return 0;
}

      

        
        
        
      

    

Output:

1.0
1,0

      

        
        
        
      

    

I think this is Qt because it is the most subtle example of where this happens and removing the QApplication declaration makes it work again. How can I fix this?