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Beginner, Can someone Please help with this Code ?

1 reply on 1 page. Most recent reply: May 30, 2004 7:37 AM by Philip Foulkes

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Tara

Posts: 3
Nickname: suzan
Registered: May, 2004

Beginner, Can someone Please help with this Code ?

Posted: May 30, 2004 4:37 AM

hi guys im new to Java and i really need your help with this code, the program should encrypt and decrypt. For example encrypt a message of 10 charactors in length according to the rules below

The encryption is done by transposing characters using a given key stored as a string in the Encryptor class.Assume the key is "6230175498",then the character at index 0(the first character)is moved to position (index)6,the character at index 1 becomes the character at index 2, and so on ,for eg, "beam me up" will be "m ea ebmpu"
then have to write a class EncrypterTest to do 2 things

1- asks the user for 10 characters message ,encryps it and display the ecrypted message ,then decrypts it and display the decrypted message

2- asks the user for a message to decryp,then display the decrypted message .

this is my code so far its uncomplete and has errors, im kinda lost please help me to complete it or if u can or if u know simpler way to write it
1,000,000 thanks

public static void encrypt()
{
String input;
}

public static void decrypt()
{
}

public static void main(String[] args)
{
String key ;
String key2 ;

key = "6230175498";
Key2 = "0123456789";

String input = "Beam me up";

int x = 0;
int y = 0;

while (x < 10)
{

keyListing = key.charAt(x);

theKey = Character.getNumericValue(keyListing);

input2 = input.charAt(theKey);

System.out.print(input2);

x++;
}

While (y < 10)
{

keyListing = key.charAt(y);

theKey = Character.getNumericValue(keyListing);

input3 = input.charAt(theKey);

System.out.print(input3);

y++;

}

}

}

Philip Foulkes

Posts: 19
Nickname: frodo
Registered: May, 2004

Re: Beginner, Can someone Please help with this Code ?

Posted: May 30, 2004 7:37 AM

/* Philip Foulkes
May 2004 */

public class Tara
{
	// Encrpy a String of length 10
	public static String encrypt (String input)
	{
		assert input.length() == 10;
		
		String key = "6230175498";
		char[] tmp = new char [10];
		
		for (int i = 0; i < 10; i++)
		{
			tmp[Character.getNumericValue(key.charAt(i))] = input.charAt(i);
		}
		
		return new String (tmp);
	}
 
	// Decrpy a String of length 10
	public static String decrypt (String input)
	{
		assert input.length() == 10;
		
		String key = /*INSERT YOUR CORRECT DECRPYT KEY HERE!*/;
		char[] tmp = new char [input.length()];
		
		for (int i = 0; i < input.length(); i++)
		{
			tmp[Character.getNumericValue(key.charAt(i))] = input.charAt(i);
		}
		
		return new String (tmp);
	}
 
	public static void main (String[] args) 
	{
		String input = "Beam me up";
		System.out.println (encrypt(input));
		System.out.println (decrypt(encrypt(input)));
	}
}

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