The ancient Roman Emperor Caesar used the following methods to encrypt military intelligence during the war: please write a program that encrypts or decrypts the user-entered English string using the above algorithm

Design idea: convert input characters into ASCLL code to add and convert to characters

Program Flowchart:

Program Source code:

Package Kehouzuoye;import Java.util.scanner;public class Jiami {public static void main (string[] args) {//TODO Auto-gener Ated method Stub      Scanner in=new Scanner (system.in);      int N=0;int key=3;      String m= "";      String Str=new string ();      System.out.printf ("Please enter a string to encrypt");      Str=in.next ();      for (int j=0;j<str.length (); j + +)        {          char B=str.charat (j);          if (b>= ' A ' &&b<= ' z ')          {            if (b>= ' X ' &&b<= ' z ')            {              b-=26;              B+=key;            }            else            {              b+=key;            }          }          m+=b;        }      System.out.println ("The string after encryption is:" +m);}  }

Results:

The ancient Roman Emperor Caesar used the following methods to encrypt military intelligence during the war: please write a program that encrypts or decrypts the user-entered English string using the above algorithm