gistfile1.hs

add1 xs n c
	| c < 0 = reverse $ add1 (reverse xs) n (abs c)
	| c > 0 = add1' xs n c
	| c == 0 = add1' xs n (length xs)
	where 
		add1' [] _ _ = []
		add1' xs n 0 = xs
		add1' (x:xs) n c
			| x == n = x+1:(add1' xs n (c-1))
			| otherwise = x:add1' xs n c

-- Below are the test runs
param = [1,4,1,5,1]

main :: IO ()
main =  do
	putStrLn . show $ param
	putStrLn . show $ add1 param 1 0
	putStrLn . show $ add1 param 1 2
	putStrLn . show $ add1 param 1 (-2)