99 Bottles of Beer

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/*
 * 99 bottles of beer in ansi c
 *
 * by Bill Wein: bearheart@bearnet.com
 *
 */

#define MAXBEER (99)

void chug(int beers);

main()
{
register beers;

for(beers = MAXBEER; beers; chug(beers--))
  puts("");

puts("\nTime to buy more beer!\n");

exit(0);
}

void chug(register beers)
{
char howmany[8], *s;

s = beers != 1 ? "s" : "";
printf("%d bottle%s of beer on the wall,\n", beers, s);
printf("%d bottle%s of beeeeer . . . ,\n", beers, s);
printf("Take one down, pass it around,\n");

if(--beers) sprintf(howmany, "%d", beers); else strcpy(howmany, "No more");
s = beers != 1 ? "s" : "";
printf("%s bottle%s of beer on the wall.\n", howmany, s);
}

Alternative Versions

Version	Author	Date	Comments	Rate
actually produces correct lyrics :P	Dustshine	08/20/05	0
Linux kernel module	Stefan Scheler	08/02/05	15
Correct ANSI C containing no semicolons	Steve Checkoway	01/15/09	0
multithreaded version	Stefan Scheler	05/11/05	4
poor Style	Matteo Casati	09/01/05	6

Comments

 marcus said on 03/09/06 22:23:26

Dang, you guys are verbose. This plays out just like the song does, forever:

int main(void)
{
int x;
char xs[4];
char *n = "o more";
char *b = " bottle";
char *o = " of beer";
char *w = " on the wall";

while(1)
{
x = 99;
while(x)
{
printf("%d%s%s%s%s, ", x, b, x == 1 ? "" : "s", o, w);
printf("%d%s%s%s\n", x, b, x == 1 ? "" : "s", o);
printf("Take %s down and pass it around, ", x-- == 1 ? "it" : "one" );
sprintf(xs, "%d", x);
printf("%s%s%s%s%s\n\n", x > 0 ? xs : "No", b, x != 1 ? "s" : "", o, w );
}
printf("N%s%ss%s%s, n%s%ss%s\n\7", n, b, o, w, n, b, o);
printf("Go to the store and buy some more\n";
}
}

 ItsMe said on 09/20/08 14:13:11

void main()
{
for(int beers=99; beers>0
{
char *s = (beers != 1) ? "s" : "";
printf("%d bottle%s of beer on the wall,\n", beers, s);
printf("%d bottle%s of beer.\n", beers, s);
printf("Take one down, pass it around,\n";
s = (--beers != 1) ? "s" : "";
if(beers>0) printf("%d bottle%s of beer on the wall.\n",beers,s);
else printf("No more bottles of beer on the wall.\n";
}
printf("Go to the store and buy some more\n";
}

 aName said on 11/29/08 03:15:41

This isn't standard at all. See for example the declaration of main(), or the declaration of the variable 'beers'. It uses the "implicit int" feature which was removed in the current version of C.

 anon said on 04/12/09 19:12:53

You also need:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

Of course

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