| | |
Summary: 3/30/2011
© Kenneth C. Louden 2003 1
Haskell userHaskell user defined typesdefined types
data Temp = Cold|Hot|Warm
deriving (Show,Eq, Ord, Enum)
-- to enable printing to screen
-- comparing for equality
i f d h < W-- comparison of order such as x < Warm
-- use in enumerations such as [Cold .. Warm]
termed an enumerated type
Cold and Hot are termed a constructor of type Temp. Constructors must
begin with a capital letter.
data Temp = Hot|Cold|Warm
deriving (Show,Eq)
data Season = Spring|Summer|Fall|Winter
d i i (Sh E )deriving (Show,Eq)
weather Winter = Cold
weather Summer = Hot
weather _ = Warm
:t weather
|
