I’d like to claim this is “one line of C”, but actually it’s 98
characters, which is more than a regulation 80-character punched card.
char*s;main(int
c,char**v){for(;;)for(s=v[1],puts(s),c=0;s[2];*s++=".##.###."[c&7],c=s[1]&1|c*2);}
It computes successive states of rule 110; it works like this:
: kra...@inexorable:~/devel/inexorable-misc ; ./rule110
................................##........................... | head -20
................................##...........................
...............................#.##..........................
..............................###.##.........................
.............................#..##.##........................
............................####.##.##.......................
...........................#...##.##.##......................
..........................###.#.##.##.##.....................
.........................#..####.##.##.##....................
........................####...##.##.##.##...................
.......................#...##.#.##.##.##.##..................
......................###.#.####.##.##.##.##.................
.....................#..####...##.##.##.##.##................
....................####...##.#.##.##.##.##.##...............
...................#...##.#.####.##.##.##.##.##..............
..................###.#.####...##.##.##.##.##.##.............
.................#..####...##.#.##.##.##.##.##.##............
................####...##.#.####.##.##.##.##.##.##...........
...............#...##.#.####...##.##.##.##.##.##.##..........
..............###.#.####...##.#.##.##.##.##.##.##.##.........
.............#..####...##.#.####.##.##.##.##.##.##.##........
If you try to run it without a command-line argument, it will crash.
As you can probably guess, both the state transition function and the
graphical output are encoded in the `".##.###."` string. If you
replace it with `v[2]`, then you can supply your own state transition
function. If you decide to use other characters for the display, make
sure that their low-order bits are different.
This software is available via
git clone http://canonical.org/~kragen/sw/inexorable-misc.git
(or in <http://canonical.org/~kragen/sw/inexorable-misc>) in the file
`rule110.c`.
Like everything else posted to kragen-hacks without a notice to the
contrary, this software is in the public domain.
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