99 Bottles of Beer

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// C++ version of 99 Bottles of Beer, object oriented paradigm
// programmer: Tim Robinson timtroyr@ionet.net
#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;
    }

Alternative Versions

Version	Author	Date	Comments	Rate
hacking style	Tim Robinson	04/20/05	14
extreme template metaprogramming	Richard Wolf	04/20/05	5
meta programming	Arion Lei	04/20/05	5
Preprocessor & self-include recursion	Chocapic	02/27/07	6
feature creep	Jono	04/27/09	1
most extreme template metaprogramming	Henrik Theiling	12/04/11	0
7	Jono	04/15/09	0
ob fuscated	Tapi (Paddy O'Brien)	08/11/05	4
GUI version	Martyn Davies	05/28/05	1

Comments

 Thomas said on 07/25/05 03:54:26

Why didn't you just overload the insertion operator to accept an instance of shelf?

 Linkku said on 08/01/05 10:14:35

#include <iostream>
using namespace std;

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 (; {
const 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;
cout << (int)Beer << " bottle" << ((int)Beer!=1?"s":""
<< " 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;
}

 Frederik said on 04/17/10 13:32:32

Nice -- clever and playful.

 Lurveleven said on 05/31/10 12:02:21

The output is not correct.

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