program that prints itself

I guess someone has heard of the programs that when executed print their code like this one :

Code:

---

#include <stdio.h>

main()
{
    char*p="main(){char*p=%c%s%c;printf(p,34,p,34,10);}%c";
    printf(p,34,p,34,10);
}

---

Can someone explain me how it works or post a link cause i can't get it.

http://www.nyx.net/~gthompso/quine.htm