How to write in a file in c++ with a if statement

i need to write in a .txt file, but instead of getting many lines (> 10000), i have only one line. Thank you for helping me.

Here's the code part :

  if (blue >= 15 && blue <= 60 && green >=100 && green <= 230 && red >=17 && red <= 65  ) {

//        if ( blue != 255 && red!=255 && green !=255 && blue != 0 && green != 0 && red != 0) {
   doc << "Pour tout [" << X << "," << Y << "," << Z << "] : [" << blue << "," << green << "," << red << "]";
     }
         else {
      doc << "Pour tout [" << X << "," << Y << "," << Z << "] : [" << 0 << "," << 0 << "," << 0 << "]" ;
     }
       doc.close();`