Computer Science Canada

Converting from morse into english
Author:  helpneeded [ Mon Jan 02, 2006 9:47 am ]
Post subject:  Converting from morse into english
I have to write a program that converts long sentenses to morse code and from morse code to english

can someone give me a little hint on how to start, please!
Author:  rizzix [ Mon Jan 02, 2006 11:30 am ]
Post subject: 
Create a HashTable that maps morse code to english alphabets or visa-versa. Wink
Author:  helpneeded [ Mon Jan 02, 2006 1:42 pm ]
Post subject:  hmm
I dunno how to use that, i was thinking about using arrays

bare with me for a second

------
the user would be asked to input the message
please enter message: [input] --- input would be the message (and the stuff to be translated)

is it possible to convert the message [input] into arrays so that each string within the array can be accessed individualy ?

------------

for example; if the user enters "Hello I would like to convert this text into morse code"

is it possible to have access to hello, i, would, like, to, etc... (Or whatever the string within a random input is}?
Author:  turboliux [ Mon Jan 02, 2006 2:22 pm ]
Post subject: 
i would make that first the user chooses:
1. Morse > English
2. English > Morse

and then use one of the following methods:
toMorse(), toEnglish()

as rizzix said, it better to use hash tables, because letters in Morse are not equal in length.
Author:  wtd [ Mon Jan 02, 2006 2:23 pm ]
Post subject: 
Take this as an opportunity to learn how to use hash tables.

Google for "hashtable site:java.sun.com"
Author:  turboliux [ Mon Jan 02, 2006 2:29 pm ]
Post subject: 
for toMorse() i would use following aproach:
code:
switch (letter){
case 'a':
array1 [0] = 96;
array1 [1] = 95;
break;

case 'b':
array2 [0] = 95;
array2 [1] = 96;
array2 [2] = 96;
array2 [3] = 96;
break;
}
Author:  wtd [ Mon Jan 02, 2006 2:38 pm ]
Post subject: 
Don't use magic numbers. Create constants like:

code:
final int DASH = ...;
final int DOT = ...;
Author:  helpneeded [ Mon Jan 02, 2006 3:34 pm ]
Post subject: 
Thanks, but it is required that i use arrays, is there a way to do it with arrays, it doesnt matter if its harder, i want to get a good mark on this!
Author:  wtd [ Mon Jan 02, 2006 6:00 pm ]
Post subject: 
Well, do you understand ASCII?
Author:  helpneeded [ Mon Jan 02, 2006 8:30 pm ]
Post subject: 
Yep, I know ASCII

Ok, I got the basic part of the english to morse (just BASIC) processing, it is functioning; however, I cannot use the same concept I used to translate English to Morse for the translation from Morse to English due to the difference in sizes


HERE:::

// The "ISP" class.
import java.awt.*;
import hsa.Console;
import java.io.*;

public class ISP
{
static Console c; // The output console
static int x = 0;
static String content;
static PrintWriter output;
static int size;
static String arrayName[] = new String [9999999]; //Array declaration
public static void askData ()
{
c.print ("Enter: ");
content = c.readLine ();
size = content.length ();

}



private static String translate (String content, int size)
{
while (x < size)
{
if (content.charAt (x) == 'a')
return (".-");
else if (content.charAt (x) == 'b')
return ("-...");
else if (content.charAt (x) == 'c')
return ("-.-.");
else if (content.charAt (x) == 'd')
return ("-..");
else if (content.charAt (x) == 'e')
return (".");
else if (content.charAt (x) == 'f')
return ("..-.");
else if (content.charAt (x) == 'g')
return ("--.");
else if (content.charAt (x) == 'h')
return ("....");
else if (content.charAt (x) == 'i')
return ("..");
else if (content.charAt (x) == 'j')
return (".---");
else if (content.charAt (x) == 'k')
return ("-.-");
else if (content.charAt (x) == 'l')
return (".-..");
else if (content.charAt (x) == 'm')
return ("--");
else if (content.charAt (x) == 'n')
return ("-.");
else if (content.charAt (x) == 'o')
return ("---");
else if (content.charAt (x) == 'p')
return (".--.");
else if (content.charAt (x) == 'q')
return ("--.-");
else if (content.charAt (x) == 'r')
return (".-.");
else if (content.charAt (x) == 's')
return ("...");
else if (content.charAt (x) == 't')
return ("-");
else if (content.charAt (x) == 'u')
return ("..-");
else if (content.charAt (x) == 'v')
return ("...-");
else if (content.charAt (x) == 'w')
return (".--");
else if (content.charAt (x) == 'x')
return ("-..-");
else if (content.charAt (x) == 'y')
return ("-.--");
else if (content.charAt (x) == 'z')
return ("--..");
else if (content.charAt (x) == '1')
return (".----");
else if (content.charAt (x) == '2')
return ("..---");
else if (content.charAt (x) == '3')
return ("...--");
else if (content.charAt (x) == '4')
return ("....-");
else if (content.charAt (x) == '5')
return (".....");
else if (content.charAt (x) == '6')
return ("-....");
else if (content.charAt (x) == '7')
return ("--...");
else if (content.charAt (x) == '8')
return ("---..");
else if (content.charAt (x) == '9')
return ("----.");
else if (content.charAt (x) == '0')
return ("-----");
else if (content.charAt (x) == ' ') //Spacing
return ("/");
else
return ("WRONG");
}
return ("");
}



public static void displayData () // Displays the data in an array (English to Morse)
{
while (true)
{
arrayName [x] = translate2 (content, size);
c.print (arrayName [x]);
c.print (" ");
x = x + 1;
}
}


//////////////////////////////////Morse to English\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
private static String translate2 (String content, int size)
{
while (true)
{
if (content.charAt (x) == '.' && content.charAt (x + 1) == '-' && content.charAt (x + 2) == ' ')
return ("A");

else if (content.charAt (x) == '-' && content.charAt (x + 1) == '.' && content.charAt (x + 2) == '.' && content.charAt (x + 3) == ' ')
return ("B");

}
}


public static void displayData2 () // Displays the data in an array (Morse to English)
{
while (content.charAt (x) != '/')
{
arrayName [x] = translate2 (content, size);
c.print (arrayName [x]);
c.print (" ");
x = x + 1;
}
}


public static void main (String[] args)
{
c = new Console ();
askData ();
displayData2 ();

// Place your program here. 'c' is the output console
} // main method
} // ISP class


ASCII would have helped in translating from English to Morse, I am not sure if it would help in translating from Morse to English;

is there a way? (Thinking)
Author:  wtd [ Mon Jan 02, 2006 10:18 pm ]
Post subject: 
There are several issues with the code you've shown us.


  • Use code tags!
  • You do not need to manually keep track of the size of Strings and arrays in Java.

    code:
    String content, int size

  • code:
    static String arrayName[] = new String [9999999];


    Why have you allocated such an enormous array? This is eating a huge chunk of memory.
  • Your long "if...else if... else" can be much better expressed as a "switch" construct.
Author:  Andy [ Thu Jan 05, 2006 11:33 am ]
Post subject: 
store your morse code in an array of string, then use indexOf on each character from your english word.

:


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