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?
Change
for (int h = 0; h < message.length(); h++)
to
for (int h = 0; h < KEY.length(); h++)
You are trying to append KEY to keyword... so you need to check its length and not of some other string.
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 .
I'm assuming that keyWord is a String. The problem is that when you do this:
keyWord += KEY.charAt(h);
The expression KEY.charAt(h) is of type char, which is an integer value. When you add an integer to a String using + (or +=), the compiler generates code to add the string representation of the integer value. It does not append the character itself.
