Fibonacci numbers in Haskell

Example for versions GHC 6.10.4

This example uses one of the main Haskell features — lazy evaluations and infinite lists. Infinite list of Fibonacci numbers fibs is defined using zipWith function which applies its first argument (a function of two variables, in this case +) to pairs of corresponding elements of second and third arguments (lists). tail fibs returns tail of the list fibs (i.e., all elements except for the first one). Thus first element of the list returned by zipWith is a sum of first and second elements of list fibs and becomes its third element. 

module Main where

import Text.Printf

fibs :: [Int]
fibs = 0 : 1 : zipWith (+) fibs (tail fibs)

line n = printf "%d, " $ fibs !! n

main = do
    sequence_ $ map line [1..16]
    putStrLn "..."