start
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                      init example                                              
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                           read config file                                     
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                               init internal variable                                                                                                                           
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                  wait for user interaction                                                                                                     
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                       print information                                        
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                             finish             
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                                                                
                                                                                                                                              print end