Sudan function: Difference between revisions

=={{header|Nim}}==

<syntaxhighlight lang="Nim">import std/[unicode, strformat]

func sedan(n, x, y: Natural): int =

if n == 0: return x + y

if y == 0: return x

let z = sedan(n, x, y - 1)

return sedan(n - 1, z, z + y)

const Delta = ord("₀".toRunes()[0]) - ord('0')

func subscript(n: Natural): string =

for c in $n:

result.add Rune(ord(c) + Delta)

for (n, x, y) in [(0, 0, 0), (1, 1, 1), (2, 1, 1), (2, 2, 1), (2, 2, 2), (3, 1, 1)]:

echo &"F{subscript(n)}({x}, {y}) = {sedan(n, x, y)}"

</syntaxhighlight>

{{out}}

<pre>F₀(0, 0) = 0

F₁(1, 1) = 3

F₂(1, 1) = 8

F₂(2, 1) = 27

F₂(2, 2) = 15569256417

F₃(1, 1) = 10228

</pre>