From 98329e0a3dd4f78b5d815ac3896272ec70904901 Mon Sep 17 00:00:00 2001 From: Eugen Wissner Date: Thu, 11 Dec 2025 10:28:11 +0100 Subject: Add remaining haskell book exercises --- Haskell-book/13/Cipher.hs | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) create mode 100644 Haskell-book/13/Cipher.hs (limited to 'Haskell-book/13/Cipher.hs') diff --git a/Haskell-book/13/Cipher.hs b/Haskell-book/13/Cipher.hs new file mode 100644 index 0000000..55dc7c4 --- /dev/null +++ b/Haskell-book/13/Cipher.hs @@ -0,0 +1,16 @@ +module Cipher where + +import Data.Char +import Data.List + +vigenere :: String -> String +vigenere = f (cycle [0, 11, 11, 24]) + where f _ [] = [] + f ys (' ':xs) = ' ' : (f ys xs) + f (y:ys) (x:xs) = (decode (x, y)) : (f ys xs) + where decode (x, y) = chr ((mod ((ord x) - 65 + y) 26) + 65) + +main :: IO () +main = do + i <- getLine + putStrLn $ vigenere i -- cgit v1.2.3