#include <fstream.h>

                       enum Bottle { BeerBottle };

                       class Shelf {
                           unsigned BottlesLeft;
                       public:
                           Shelf( unsigned bottlesbought )
                               : BottlesLeft( bottlesbought )
                               {}
                           void TakeOneDown()
                               {
                               if (!BottlesLeft)
                                   throw BeerBottle;
                               BottlesLeft--;
                               }
                           operator int () { return BottlesLeft; }
                           };

                       int main( int, char ** )
                           {
                           Shelf Beer(99);
                           try {
                               for (;;) {
                                   char *plural = (int)Beer !=1 ? "s" : "";
                                   cout << (int)Beer << " bottle" << plural
                                        << " of beer on the wall," << endl;
                                   cout << (int)Beer << " bottle" << plural
                                        << " of beer," << endl;
                                   Beer.TakeOneDown();
                                   cout << "Take one down, pass it around," << endl;
                                   plural = (int)Beer !=1 ? "s":"";
                                   cout << (int)Beer << " bottle" << plural
                                        << " of beer on the wall." << endl;
                                   }
                               }
                           catch ( Bottle ) {
                               cout << "Go to the store and buy some more," << endl;
                               cout << "99 bottles of beer on the wall." << endl;
                               }
                           return 0;
                           }