Reverse Rot

Original Description

Idea

Manipulate the ASCII value of chars

Handle special cases of moving them to the end of normal ones. Then use module to get the result after shift

Code

import java.util.*;
public class Reverse_Rot {

	public static void encrypt(String s, int k){
		for(int i = s.length()-1; i>=0; i--){
			char c = s.charAt(i);
			if(c == 95) c = 91;
			if(c == 46) c = 92;
			c = (char)(c + k);
			c = (char)((c - 'A') % 28 + 'A');
			if(c == 91) c = 95;
			if(c == 92) c = 46;
			System.out.print(c);
		}
		System.out.println();
	}
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scan = new Scanner(System.in);
		while(scan.hasNext()){
			int k = scan.nextInt();
			if(k == 0)
				break;
			String s = scan.next();
			encrypt(s,k);
		}

	}

}