Let's go!
\begin{haskellcode}
x :: Int
x = 3

-- how about this?
x = 5

-- Int vs Integer
n :: Integer
n = 12345678909876543219873409823349873498723498

d :: Double
d = 5.0

c :: Char
c = 'k'

s :: String
s = "Hello, world?"
\end{haskellcode}