How do I make a project that encrypts and decrypts a word the user inputs?

[Natasha Morehouse]

I am using Eclipse, so I don't need any code for the ASCII.

I need to create a project that encrypts and decrypts whatever the user inputted. Here is the code I wrote:

import java.util.Scanner;

public class Encryption 
{
	public static String message = "";
	public static boolean hasMessage = false;
	public static boolean encrypted = false;

	public static void display()
	{
		System.out.println("Message: " + message + "\n");
	}

	public static void encrypt(String word)
	{
		if(!hasMessage)
		{
			System.out.println("No message");
			// Tell the user there is no message
		}
		else if(encrypted)
		{
			System.out.println("Message is already encrypted");
			// Tell the user the message is already encrypted
		}
		else
		{
			message = " ";
			// Reset the message to blank
			word=message.charAt(0);
			char word = ‘’;
			int 1 = (int) word
					int 1 = ;
			char word = (char) 1

					word1=message.charAt(1);
			char word1 = ‘’;
			int 2 = (int) word1
					int 2 = ;
			char word1 = (char) 2

					word2=message.charAt(2);
			char word2 = ‘’;
			int 3 = (int) word2
					int 3 = ;
			char word2 = (char) 3

					message = word1 + word2 + word3;
			System.out.println(message);
			encrypted = true;
			// Using the parameter word, modify message
			// to contain a new value following a predictable pattern
			// Hint:  alter each character's ASCII value by casting
			//        to an integer and using math operators

			// Display the new message
			// Set encrypted to true

		}
	}

	public static void decrypt(String word)
	{
		if(!hasMessage)
		{
			System.out.println("No message")
			// Tell the user there is no message
		}
		else if(!encrypted)
		{
			System.out.println("Message not encrypted")
			// Tell the user the message is not encrypted

		}
		else
		{
			char word = (char) 1; 

			char word1 = (char) 2; 

			char word2 = (char) 3; 
			message = word + word1 + word2
			System.out.println(message)
			// Like encrypt, but in reverse
		}

	}

	public static void main(String[] args) 
	{  
		Scanner sc = new Scanner(System.in);
		int menuChoice = 0;

		while(menuChoice != 4)
		{
			System.out.println(	"[1] Enter Word\n" + 
					"[2] Encrypt\n" + 
					"[3] Decrypt\n" + 
					"[4] Quit\n");

			menuChoice = sc.nextInt();

			if(menuChoice == 1)
			{
				System.out.println("Input message");
				message = sc.next();
				// prompt user to input message
				// assign next word to the class-level variable message
				hasMessage = true;
				encrypted = false;
				// set hasMessage to true
				// set encrypted to false

			}
			else if(menuChoice == 2)
			{
				encrypt(message);
			}
			else if(menuChoice == 3)
			{
				decrypt(message);
			}
		}
	}
}

[Henry Wong]

Natasha Morehouse wrote:I am using Eclipse, so I don't need any code for the ASCII.

Huh ?!?!?!?

[Natasha Morehouse]

Henry Wong wrote:

Natasha Morehouse wrote:I am using Eclipse, so I don't need any code for the ASCII.

Huh ?!?!?!?

Eclipse already knows the ASCII (I don't know if you need code for it or not, my teacher didn't explain ASCII very well)

[Henry Wong]

Natasha Morehouse wrote:Eclipse already knows the ASCII (I don't know if you need code for it or not, my teacher didn't explain ASCII very well)

Java uses the unicode standard for characters. Unicode is a super set of ASCII, so Java supports ASCII.... Eclipse (the Integrated Development Environment) doesn't need to do anything special to support Java regarding this.

Henry

[Henry Wong]

Natasha Morehouse wrote:Here is the code I wrote:

	message = " ";
	// Reset the message to blank
	word=message.charAt(0);
	char word = ‘’;
	int 1 = (int) word
			int 1 = ;
	char word = (char) 1

			word1=message.charAt(1);
	char word1 = ‘’;
	int 2 = (int) word1
			int 2 = ;
	char word1 = (char) 2

			word2=message.charAt(2);
	char word2 = ‘’;
	int 3 = (int) word2
			int 3 = ;
	char word2 = (char) 3

			message = word1 + word2 + word3;

Have you compiled this code? The section above isn't valid Java code.

Henry

[Natasha Morehouse]

I know, I'm attempting to fix that right now (I kind of suck at programming)

[Henry Wong]

Natasha Morehouse wrote:I know, I'm attempting to fix that right now (I kind of suck at programming)

A couple of recommendations that may help... First, when using pseudo code (not real code), it may be a good idea to "comment" them -- meaning prefix those lines with "//". This way, you can still compile the partially completed code. Second, no need to invent a new language for pseudo code, writing it using java syntax mixed with english is probably best -- but this is your decision, whatever is easier. Also, eclipse support the TODO tag in comments. When you add this tag, eclipse will highlight them in a different color, and lists them in one of the subwindows. Basically, eclipse is keeping a TODO list for you.

Henry

[Natasha Morehouse]

Henry Wong wrote:

A couple of recommendations that may help... First, when using pseudo code (not real code), it may be a good idea to "comment" them -- meaning prefix those lines with "//". This way, you can still compile the partially completed code. Second, no need to invent a new language for pseudo code, writing it using java syntax mixed with english is probably best -- but this is your decision, whatever is easier. Also, eclipse support the TODO tag in comments. When you add this tag, eclipse will highlight them in a different color, and lists them in one of the subwindows. Basically, eclipse is keeping a TODO list for you.

Henry

Thanks I'll try to do that, but I am having trouble on figuring out how to make it so the word's ASCII will change when encrypted and will be the same word when decrypted