RosettaCodeData/Task/Mutual-recursion/BCPL/mutual-recursion.bcpl

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get "libhdr"
// Mutually recursive functions
let f(n) = n=0 -> 1, n - m(f(n-1))
and m(n) = n=0 -> 0, n - f(m(n-1))
// Print f(0..15) and m(0..15)
let start() be
$( writes("F:")
for i=0 to 15 do
$( writes(" ")
writen(f(i))
$)
writes("*NM:")
for i=0 to 15 do
$( writes(" ")
writen(m(i))
$)
writes("*N")
$)