Haskell helloworld

Categories: Development Notes; Tagged with: ; @ April 23rd, 2014 0:35

Install Haskell in Linux/Mint

sudo apt-get install haskell-platform

Hello World

GDEV guoliangDev # ghci
GHCi, version 7.6.3: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
Prelude> putStrLn "hello, world"
hello, world

Simple Function

Prelude> let sayHi name=putStrLn("Hi " ++ name)
Prelude> sayHi "Li"
Hi Li

Put the function into .hs file
example: main = putStrLn(“hello World!”)

Compile & execute :

GDEV helloWorld # vi sayHi.hs
GDEV helloWorld # ghc -o sayHi sayHi.hs 
[1 of 1] Compiling Main ( sayHi.hs, sayHi.o )
Linking sayHi ...
GDEV helloWorld # ./sayHi 
hello World!

How to quit/exit ghci?

Prelude> :quit
 Leaving GHCi.


Input and Output: http://learnyouahaskell.com/input-and-output
Haskell in 5 steps:  http://www.haskell.org/haskellwiki/Haskell_in_5_steps

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