module TestCombinedExample.Fib where

-- | Calculate Fibonacci number of given 'Num'.
--
-- First let's set `n` to ten:
--
-- >>> let n = 10
--
-- And now calculate the 10th Fibonacci number:
--
-- >>> fib n
-- 55
--
-- >>> let x = 10
-- >>> x
-- 10
fib :: Integer -> Integer
fib :: Integer -> Integer
fib Integer
0 = Integer
0
fib Integer
1 = Integer
1
fib Integer
n = Integer -> Integer
fib (Integer
n Integer -> Integer -> Integer
forall a. Num a => a -> a -> a
- Integer
1) Integer -> Integer -> Integer
forall a. Num a => a -> a -> a
+ Integer -> Integer
fib (Integer
n Integer -> Integer -> Integer
forall a. Num a => a -> a -> a
- Integer
2)