package hackerrank;

public class CaesarCipher {

static String caesarCipher(String s, int k) {

StringBuffer result = new StringBuffer();

for (int i = 0; i < s.length(); i++) {

//대문자

if (Character.isUpperCase(s.charAt(i))) {

char ch = (char) (((int) s.charAt(i) + k - 65) % 26 + 65);

result.append(ch);

//소문자

} else if(Character.isLowerCase(s.charAt(i))) {

char ch = (char) (((int) s.charAt(i) + k - 97) % 26 + 97);

result.append(ch);

//기타 특수문자등

} else {

result.append(s.charAt(i));

}

}

return result.toString();

}

public static void main(String[] args) {

System.out.println(caesarCipher("a-z", 2) + ", ans: c-b");

//System.out.println(caesarCipher("middle-Outz", 2) + ", ans: okffng-Qwvb");

//System.out.println(caesarCipher("Hello_World!", 4) + ", ans: Lipps_Asvph!");

//System.out.println(caesarCipher("www.abc.xy", 87) + ", ans: fff.jkl.gh");

}

}