LaTeX-examples/documents/Programmierparadigmen/scripts/haskell/fibonacci-akk.hs

fibAkk n n1 n2
    | (n == 0)  = n1
    | (n == 1)  = n2
    | otherwise = fibAkk (n - 1) n2 (n1 + n2)
fib n = fibAkk n 0 1