Question

There is a slight part of my program that is not working correctly and I just cannot work out why

String KEY = "hello"
for (int h = 0; h < message.length(); h++)
{
    keyWord += KEY.charAt(h);
}

Once I run the loop the keyWord string does not hold the letters it should of hello, but if I bypass it and just use KEY in my program it will work fine.

Could someone shed some light as to what I am doing wrong please?

Answer 1

I now see what you are trying to do, you are creating a cipher.

public class Test {

     public static void main(String[] args){
           String key = "hello";
           String keyWord = "";
           String message = "asdfghj";
           for (int i = 0; i < message.length();i++)
           {
               keyWord += key.charAt(i %key.length());             
           }
           System.out.println(keyWord);
}
}

For anyone who is not sure the % or modulo operator returns the remainder of division. For instance 4 % 5 = 4 as 4 / 5 leaves a remainder of 4 because it goes into it 0 times. Now 6%5 = 1 as 6/5 = 1 R1 .