Mutual recursion

editable example

Click the pencil to open this in an editor, change it, and run it in your browser. The same solution is posted on Rosetta Code.

ghul

use IO.Std.write_line

use Ghul.Pipes

female(n: int) -> int => if n == 0 then 1 else n - male(female(n - 1)) fi

male(n: int) -> int => if n == 0 then 0 else n - female(male(n - 1)) fi

show(name: string, function: (int) -> int pure) =>

write_line("{name} {(0..20) |> map(function) |> join(" ")}")

show("F:", female)

show("M:", male)

F: 1 1 2 2 3 3 4 5 5 6 6 7 8 8 9 9 10 11 11 12
M: 0 0 1 2 2 3 4 4 5 6 6 7 7 8 9 9 10 11 11 12