Welcome to HBH! If you had an account on hellboundhacker.org you will need to reset your password using the Lost Password system before you will be able to login.
ROT 13 - Java Code Bank
ROT 13
Encrypts a given text using the ROT 13 encryption, GUI version coming soon.
import java.io.*;
import java.util.*;
public class rot13
{
static Scanner console = new Scanner(System.in);
private static BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
public static void main(String args[]) throws IOException
{
String plaintext;
int x;
System.out.println("Enter words to encrpyt");
plaintext = stdin.readLine();
x = plaintext.length();
char[] chars = new char[x];
for (int i = 0; i < x; i++)
{
chars[i] = plaintext.charAt(i);
}
System.out.print("The encrypted text is: ");
for (int i = 0; i < chars.length; i++)
{
if ((chars[i] >= 'a' && chars[i] <= 'm'))
{
chars[i] += 13;
}
else if ((chars[i] >= 'n' && chars[i] <= 'z'))
{
chars[i] -= 13;
}
else if ((chars[i] >= 'A' && chars[i] <= 'M'))
{
chars[i] += 13;
}
else if ((chars[i] >= 'N' && chars[i] <= 'Z'))
{
chars[i] -= 13;
}
System.out.print(chars[i]);
}
}
}
Comments
ghost 13 years ago
you could use a .toUpperCase() for the input, then you could omit 7 lines from the encryption for loop, if ((chars[i] >= 'a' && chars[i] <= 'm')) { chars[i] += 13; } else if ((chars[i] >= 'n' && chars[i] <= 'z')) { chars[i] -= 13; }
also you could combine the 2 loops. I know in a program this size efficiency isn't really necessary, but it is always a good thing to go for:)
ghost 13 years ago
you could use a .toUpperCase() for the input, then you could omit 7 lines from the encryption for loop, if ((chars[i] >= 'a' && chars[i] <= 'm')) { chars[i] += 13; } else if ((chars[i] >= 'n' && chars[i] <= 'z')) { chars[i] -= 13; }
also you could combine the 2 loops. I know in a program this size efficiency isn't really necessary, but it is always a good thing to go for:)