Algorithm/acmicpc.net/source/11655.java at master · tdm1223/Algorithm · GitHub

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// 11655. ROT13
// 2019.09.19
// 문자열 처리
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String args[]) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		String s = br.readLine();

		for (int i = 0; i < s.length(); i++) {
			if (s.charAt(i) >= 'a' && s.charAt(i) <= 'z') {
				if (s.charAt(i) >= 'n' && s.charAt(i) <= 'z') {
					System.out.print((char) (s.charAt(i) - 13));
				} else {
					System.out.print((char) (s.charAt(i) + 13));
				}
			} else if (s.charAt(i) >= 'A' && s.charAt(i) <= 'Z') {
				if (s.charAt(i) >= 'N' && s.charAt(i) <= 'Z') {
					System.out.print((char) (s.charAt(i) - 13));
				} else {
					System.out.print((char) (s.charAt(i) + 13));
				}
			} else {
				System.out.print(s.charAt(i));
			}
		}
	}
}