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Scala implementation of the Caesar Cipher
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| //Ceasar (Shift) Cipher | |
| //Pedro Miguel Sosa | |
| //www.KonukoII.com | |
| //Tutorial & Explanation: http://konukoii.com/blog/2016/03/24/caesar-cipher-in-scala/ | |
| object CeasarCipher extends App{ | |
| //Define Alphabet | |
| //feel free to add more elements to your 'alphabet' (eg. Nums: 123... or Symbols: !?@#...) | |
| val alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
| //We will shift our plaintext by this much | |
| //Notice: shift = (# + 26) % 26 <-- This allows us to take any number (even if it is negative, or bigger than our alphabet size) | |
| val shift = (scala.io.StdIn.readLine("Shift By: ").toInt + alphabet.size) % alphabet.size | |
| //What is the code we want to encrypt/decrypt | |
| val inputText = scala.io.StdIn.readLine("Secret Message: ") | |
| //Lets Encrypt/Decrypt the code | |
| val outputText = inputText.map( (c: Char) => { | |
| //We find the c char in our allowed alphabet | |
| val x = alphabet.indexOf(c.toUpper) | |
| //If the c char is in our alphabet then we encrypt it | |
| //If it is not then we leave it be. | |
| if (x == -1){ | |
| c | |
| } | |
| else{ | |
| alphabet((x + shift) % alphabet.size) | |
| } | |
| }); | |
| //Print the result | |
| println(outputText); | |
| } |
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