11655: ROT13

www.acmicpc.net/problem/11655

11655번: ROT13

 

a~m까지 13개, m~z까지 13개 

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import java.util.*;

public class Main {
    public static String rot13(String s) {
        String ans = "";
        for (int i=0; i<s.length(); i++) {
            
            char c = s.charAt(i);
            
            if (c >= 'a' && c <= 'm') c += 13;   
            else if (c >= 'n' && c <= 'z') c -= 13;   
            else if(c >= 'A' && c <= 'M') c += 13;
            else if(c >= 'N' && c <= 'Z') c -= 13;
            ans += c;
        }
        return ans;
    }
    
    public static void main(String args[]) {
        Scanner s = new Scanner(System.in);
        String st = s.nextLine();
        System.out.println(rot13(st));
    }
}