CODEWITHSUNDEEP
stringhaskellinteger
WombatCombat
WombatCombat

Reputation: 51

How to convert strings to integers in haskell?

I am working on implementing the RSA encryption system for a class or mine and to be able to implement it we obviously would need to convert strings to integers and then the reverse of that. Using basic level haskell can someone explain to me how this might be done. I have a function that will tell me the max length that a character code can be for your consideration as well.

Thank you everyone.

Upvotes: 0

Views: 3332

Answers (2)

Yuriosity
Yuriosity

Reputation: 1918

You may also use the ByteString module: convert a simple String into a ByteString with pack and then directly work with it as an array of bytes (Word8's, if to be exact).

Upvotes: 0

DJG
DJG

Reputation: 6543

I am not sure exactly what you need, but if you are just trying to get a numerical representation of a String, you can use Data.Char.ord which will convert a Char to an Int. Then you can use Data.Char.chr to convert each Int back to a Char.

Using:

import Data.Char (ord, chr)

stringsToInts :: String -> [Int]
stringToInts = map ord

intsToString :: [Int] -> String
intsToString = map chr

you can:

Prelude Data.Char> let ints = stringsToInts "Hello world!"
Prelude Data.Char> ints
[72,101,108,108,111,32,119,111,114,108,100,33]
Prelude Data.Char> intsToString ints
"Hello world!"

You could then further process the list ints if that is what you need (and further modify intsToString.)

Upvotes: 4

Related Questions