i have a problem sollving this very simple question?
here goes
a programme in java is made to encrypt and decrypt messages.
using only letters. the programme should be done
using the ascii code. and instead of an a show b and b an c
for example "dog" should be encrypt as "eph". letter +1
what is the code that will allow me to do that?
Well, if you're going to be looking at character values, you probably need a character array from the string, try str. toCharArray(). Next, all you need to know is that you're allowed to add numbers to characters, so loop over your array and add one to the letters. Now, any character that's z+1 goes to an 'a', and you can get a string with new String(myChars).
~Cheers
I might suggest coming up with better "subject" descriptions, and not referring to character rotation as encryption.
public class Test {
public static String rotate(String s) {
char[] arr = s.toCharArray();
StringBuffer sb = new StringBuffer(arr.length);
for (int i = 0; i < arr.length; i++) {
char c = arr[i];
if (c == 'z')
sb.append('a');
else if (c == 'Z')
sb.append('A');
else if (c >= 'a' && c < 'z' || c >= 'A' && c < 'Z')
sb.append((char) (c + 1));
else
throw new RuntimeException("Only letters a-z and A-Z can be rotated, not character: " + c);
}
return sb.toString();
}
public static void main(String[] args) {
System.out.println(rotate(args[0]));
}
}
thanks for the help
you mentioned the string s.chatAt(index)
in the bracettes what do i need to write the programme is simple.
the computer ask to write a message to be encrypted.
example i wirte hello. then enter
the computer or the programme shoul change that in to letter +1 how do i set tha to happen would do i have to write in java to do that
thanks in advance
> thanks for the help
> you mentioned the string s.chatAt(index)
> in the bracettes what do i need to write the
> programme is simple.
> the computer ask to write a message to be encrypted.
> example i wirte hello. then enter
> the computer or the programme shoul change that in to
> letter +1 how do i set tha to happen would do i have
> to write in java to do that
> thanks in advance
Did you run the example rkippen gave you? You should be able to finish your assignment based on that example. Please post your code and tell where you're stuck.
here's the complete code:
String let = "Root";
char chars[] = let.toCharArray();
char flipChars[] = new char[let.length()];
for (int i=0;i < chars.length;i++)
{
if (1 + let.toCharArray() == 123) flipChars = (char) 97;
else
flipChars = (char) (1 + let.toCharArray());
}
System.out.println("" + new String(flipChars));
Console output==>> Sppu