package javaapplication1;

import java.util.Scanner;
public class JavaApplication1 {


    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char resp;
        String cad;

        System.out.println("Introduce la cadena de caracteres");
        cad=sc.nextLine();
        cad=cad.toLowerCase();
        System.out.println("¿Quieres cifrar o descifrar? responde con c/d");
        resp=sc.next().charAt(0);
        if(resp=='d'){
            System.out.println(descifrar(cad));
        }else if(resp=='c'){
            System.out.println(cifrar(cad));
        }
    }
    static String descifrar (String cad){
        int num;
        char let;
        String cades;
        cades="";
        for (int i = 0; i < cad.length() ; i++) {
            num=(int)cad.charAt(i);
            if(num==65533){//65533 es la equivalencia int en netbeans de la ñ
                num='l';
            }else if (num<=99) {
                num=num+23;
            }else if(num<=114&&num>=111){
                num=num-2;
            }else{
                num=num-3;
            }
            let=(char)num;
            cades=cades+let;
        }
        return cades;
    }
    static String cifrar (String cad){
        int num;
        char let;
        String cades;
        cades="";
        for (int i = 0; i < cad.length() ; i++) {
            num=(int)cad.charAt(i);
            if (num>=120) {
                num=num-23;
            }else if(num=='l'){
                num=(int)'ñ';
            }else if(num>=108&&num<=110){
                num=num+2;
            }else{
                num=num+3;
            }
            let=(char)num;
            cades=cades+let;
        }
        return cades;
    }
 }