Java中的Caesar密码

Question

I'm trying to implement the Caesar cipher .

But while doing so I am getting an unexpected output which I am unable to rectify.

Will someone help me please?

My code is as follows:

import java.io.*;

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

        int t, move = Integer.parseInt(br.readLine());
        String s = "", st = br.readLine();
        int l = st.length();

        for(int x = 0; x < l; x++){
            char c = st.charAt(x);
            t = (int)c;
            if(move != 0){
                t = t + move;
                if(t > 90){
                    t = t - 26;        
                }
                if(t < 65){
                    t += 26;
                }
                c = (char)t;
                s = st + c;
            }
        }
        System.out.println(s);
    }
}

I entered move = 2 and st = charles
The output was: charles[

Answer 1

You are changing wrong string. You are acctualy setting result with starting string st and add encrypted char. Change

s=st+c;

to

s=s+c;