Anonymous user
Elementary cellular automaton/Infinite length: Difference between revisions
Elementary cellular automaton/Infinite length (view source)
Revision as of 15:09, 29 November 2020
, 3 years ago→{{header|Nim}}
Thundergnat (talk | contribs) m (Promote to task, lots of examples, little controversy) |
|||
Line 609:
..*...*...........................................................*...*..
</pre>
=={{header|Nim}}==
{{trans|Kotlin}}
<lang Nim>import strutils
func step(cells: string; rule: int): string =
for i in 0..(cells.len - 3):
var bin = 0
var b = 2
for n in i..(i + 2):
inc bin, ord(cells[n] == '*') shl b
b = b shr 1
let a = if (rule and 1 shl bin) != 0: '*' else: '.'
result.add(a)
func addNoCells(cells: var string) =
let left = if cells[0] == '*': "." else: "*"
let right = if cells[^1] == '*': "." else: "*"
cells.insert(left)
cells.add(right)
cells.insert(left)
cells.add(right)
proc evolve(limit, rule: int) =
echo "Rule #", rule
var cells = "*"
for _ in 0..<limit:
cells.addNoCells()
let width = 40 + cells.len shr 1
echo cells.align(width)
cells = cells.step(rule)
evolve(35, 90)</lang>
{{out}}
<pre>Rule #90
..*..
..*.*..
..*...*..
..*.*.*.*..
..*.......*..
..*.*.....*.*..
..*...*...*...*..
..*.*.*.*.*.*.*.*..
..*...............*..
..*.*.............*.*..
..*...*...........*...*..
..*.*.*.*.........*.*.*.*..
..*.......*.......*.......*..
..*.*.....*.*.....*.*.....*.*..
..*...*...*...*...*...*...*...*..
..*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*..
..*...............................*..
..*.*.............................*.*..
..*...*...........................*...*..
..*.*.*.*.........................*.*.*.*..
..*.......*.......................*.......*..
..*.*.....*.*.....................*.*.....*.*..
..*...*...*...*...................*...*...*...*..
..*.*.*.*.*.*.*.*.................*.*.*.*.*.*.*.*..
..*...............*...............*...............*..
..*.*.............*.*.............*.*.............*.*..
..*...*...........*...*...........*...*...........*...*..
..*.*.*.*.........*.*.*.*.........*.*.*.*.........*.*.*.*..
..*.......*.......*.......*.......*.......*.......*.......*..
..*.*.....*.*.....*.*.....*.*.....*.*.....*.*.....*.*.....*.*..
..*...*...*...*...*...*...*...*...*...*...*...*...*...*...*...*..
..*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*.*..
..*...............................................................*..
..*.*.............................................................*.*..
..*...*...........................................................*...*..</pre>
=={{header|Perl}}==
| |||