Haskell 2D character array

Question

I have question related Haskell language.i need to store bunch of characters in 2D array.How can i store it??I have characters in 10 X 10 format in text file and i want to store it in 2D character array in haskell language.Please help me as soon as possible..thank you..

Here is the code which i tried and in this code i am trying to store value of x in the list named listofchar::

module TreasureFile where
import System.IO  


main =  do 
    hdl <- openFile "map.txt" ReadMode
    readbychar hdl

readbychar hdl =  do  
                  t <- hIsEOF hdl
                  if t 
                    then return()                     
                    else do
                      let listofchar=[] 
                      x <- hGetChar hdl
                      if x =='\n' 
                        then putChar '!'--return()
                        else listofchar x
                      readbychar hdl

This question is similar to: 2 dimension array processing in haskell. If you believe it’s different, please edit the question, make it clear how it’s different and/or how the answers on that question are not helpful for your problem. — ggorlen
– ggorlen, Commented Dec 31, 2024 at 7:18

ThreeFx · Accepted Answer · 2014-07-29 18:17:37Z

2

Try this:

import System.IO

main = do
  textContents <- readFile "map.txt"
  let map = format textContents
  print $ map

format text = lines text

Lets step through this program:

First, readFile reads us the file and binds the contents to textContents.

Next we format the contents by splitting the list every time we encounter a newline delimiter and then remove the eventually remaining empty strings.

Done! Now we can do whatever we want with our "map".

A small note on the side:

It will seem strange that our map will be displayed like this:

["aaaaaaaaaa","bbbbbbbbbbb",..] -- doesn't look like 2D map

which is just syntatic sugar for:

[['a','a','a',..],['b','b','b',..],..] -- looks more like a map now

edited Jul 29, 2014 at 18:17

answered Jul 27, 2014 at 22:11

ThreeFx

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1 Comment

Hiren Over a year ago

i am getting this error When i tried it...Could not find module Data.List.Split' It is a member of the hidden package split-0.2.2'. Perhaps you need to add `split' to the build-depends in your .cabal file. Use -v to see a list of the files searched for.

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