why does this code work

[Dmitri Makovetskiy]

   ort java.io.*;
class Trans
{
	public static void main(String[] args)
	{
		Console console=System.console();
		int count=0;
		String hebrew="";
		String deutsch="";
		String word;
		System.out.println("Please enter a word in hebrew or ENOUGH to finish");
		word=console.readLine();
		while(!word.equals("ENOUGH"))
		{
			
			hebrew=hebrew+word+"|";
			System.out.println("Please enter the meaning of "+word+" in german");
			word=console.readLine();
			deutsch=deutsch+word+"|";
			count++;
			System.out.println("Please enter a word in hebrew or ENOUGH to finish");
			word=console.readLine();
		}		

		String[] heb;
		String[] ger;
		heb=new String[count];
		ger=new String[count];

		int index=0;
		for(int i=0;i<count;i++)
		{
			word="";
			while(hebrew.charAt(index)!='|')
			{
				word+=hebrew.charAt(index);
				index++;
			}
			heb[i]=word;		// why the word variable refers to the expression in the while function and not to the variable outside ..word=""
			index++;
		}

		index=0;
		for(int i=0;i<count;i++) // if both variables equal two 0 , why the loop doesnt stop at the begining
		{
			word="";
			while(deutsch.charAt(index)!='|')
			{
				word+=deutsch.charAt(index);
				index++;
			}
			ger[i]=word;		
			index++;
		} 

This could should obtain a few words and translate them from one language to another. i got this code from my teacher and i dont understand a few things





Here is the second part of the code:

   
		      translation="";
			
     		      index=0;

		      while(index<sentence.length())
		      {
			word="";
			while(index<sentence.length() && sentence.charAt(index)==' ') // why is this loop necessary
				index++;

			while(index<sentence.length() && sentence.charAt(index)!=' ')
			{
				word+=sentence.charAt(index);		
				index++;
			}

			found=false;                      // why is that variable necessary, and what is its function
			for(i=0;i<ger.length && !found;i++)
			{
				if(word.equals(ger[i]))
					found=true;
			}
			
			if(found)                                     // to what "found" does this method refer to. found=true or found=false.. and why?
				translation=translation+heb[i-1]+" ";
			else
				translation=translation+word+" ";
		      }

		       System.out.println(translation);
		       System.out.println("Please enter a sentence in german for translation");		
		       sentence=console.readLine();

		}
		




	}
} 

[Jesper de Jong]

First part:

Line 39: I don't understand what you're asking there. 'word' is filled by concatenating letters in the loop on lines 34 - 38.

Line 44: If both i and count are 0, then the loop will stop at the beginning (it won't run at all). However, most of the time, count will not be 0. Note that count is incremented in line 20.

Second part:

Line 9: The loop advances 'index' to the first character in 'sentence' that is not a space (note that line 10 is the body of the loop).

Line 18: The variable 'found' is used to keep track of if the content of 'word' is found in the array 'ger'; lines 19 - 23 loop over 'ger' to see if 'word' is in there, and if so, then 'found' is set to true.

Line 25: 'found' is not a method, it's a variable. It will be true when 'word' was found in the array 'ger', and false if it was not found (see above).

[Dmitri Makovetskiy]

Jesper Young wrote:First part:

Line 39: I don't understand what you're asking there. 'word' is filled by concatenating letters in the loop on lines 34 - 38.

Line 44: If both i and count are 0, then the loop will stop at the beginning (it won't run at all). However, most of the time, count will not be 0. Note that count is incremented in line 20.

Second part:

Line 9: The loop advances 'index' to the first character in 'sentence' that is not a space (note that line 10 is the body of the loop).

Line 18: The variable 'found' is used to keep track of if the content of 'word' is found in the array 'ger'; lines 19 - 23 loop over 'ger' to see if 'word' is in there, and if so, then 'found' is set to true.

Line 25: 'found' is not a method, it's a variable. It will be true when 'word' was found in the array 'ger', and false if it was not found (see above).

what i dont understand, with "word" and "found" variable.. if it is defined in and outside of the looop.. why the variable doesnt die being inside the loop..
i did this code, and when i set my variable word.. i set it like this word="";
and i defined second time inside the loop..
but when i was refering to it, it referred to the variable first defined.. word=""

how does the program selects which variable to refer to , if the same variable is defined twice

[Rene Larsen]

You define the variable 'word' in line 10 - which is the one that is been updated/reassigned in the first part in line 12, 18, 33, 36, 46 and 49 - and in the second part in line 8 and 14.

I can't see where you define the boolean variable 'found' - but it is the same that is been updated/reassigned in line 18 and 22 - and it is been used in line 25.

[Dmitri Makovetskiy]

Rene Larsen wrote:You define the variable 'word' in line 10 - which is the one that is been updated/reassigned in the first part in line 12, 18, 33, 36, 46 and 49 - and in the second part in line 8 and 14.

I can't see where you define the boolean variable 'found' - but it is the same that is been updated/reassigned in line 18 and 22 - and it is been used in line 25.

why wont all those variables inside the loop die and outside the loop dominate ?

[David Newton]

Because it's the same variable. You're not declaring a new one. It's the same one.