Description
Hangman
Write an implementation of the game \hangman” in Haskell, where the user must guess a word. Use the provided words.txt le.
Pick a random word from the words.txt le Display underscores for each unguessed letter
Read a character from the user and replace the underscores with that letter where it matches the actual word (if any)
Continue reading guesses from the user
When the user gets all the letters correct, exit
To keep things simpler, you don’t have to keep track of the number of guesses or letters already guessed, so the user will always win eventually. You can assume the input format will be correct.
For example, here the word randomly picked was \strongest”. The rst, third, etc. lines are the current state of the word being guessed. The second, fourth, etc. lines are the user inputting a letter to try:
_________
e
______e__
s
s_____es_
h
s_____es_
t
st____est
r
str___est
a
str___est
o
stro__est
n
stron_est
g
strongest
Some possibly useful functions:
getLine :: IO String
lines :: String -> [String]
randomRIO :: Random a => (a, a) -> IO a (in System.Random)
readFile :: FilePath -> IO String (FilePath is another name for String)
words :: String -> [String]
Note that in recent versions of ghc, import System.Random will give an error, since random is no longer included by default. It should work on ilab, though, since that uses an older ghc.
If you want to develop using a more recent version, you can look into how to set up a project using Stack (https://docs.haskellstack.org/en/stable/README/) and then add \- random >= 1.1″ under dependencies in package.yaml. Note that your submission will be run on ilab without stack, though.
Submission
Please submit a single le named hw4.hs on Sakai.
You should have a main function, so that your hangman game can be exe-cuted using runhaskell hw4.hs.
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