2016 Update

Task/Caesar-cipher/Lua/caesar-cipher.lua

@@ -1,30 +0,0 @@
-local function encrypt(text, key)
-	return text:gsub("%a", function(t)
-			local base = (t:lower() == t and string.byte('a') or string.byte('A'))
-
-			local r = t:byte() - base
-			r = r + key
-			r = r%26 -- works correctly even if r is negative
-			r = r + base
-			return string.char(r)
-		end)
-end
-
-local function decrypt(text, key)
-	return encrypt(text, -key)
-end
-
-caesar = {
-	encrypt = encrypt,
-	decrypt = decrypt,
-}
-
--- test
-do
-	local text = "ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz"
-	local encrypted = caesar.encrypt(text, 7)
-	local decrypted = caesar.decrypt(encrypted, 7)
-	print("Original text:  ", text)
-	print("Encrypted text: ", encrypted)
-	print("Decrypted text: ", decrypted)
-end