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Oct 3rd, 2009

Simple Array Question

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Hi,

This is a very simple question. Is it possible to print a one dimensional array into the shape of a grid?

For example if I have the follow array:

chars arrayofChars[] = {'A', 'B', 'C', 'D', 'E'...};

how can it be printed out as

A B C D
E F G H
I J K L
...

I can print it out as a 2d array but prefer to use a 1D array if possible.

Any suggestions will be great.

Thanks,

Kimjack

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KimJack

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Oct 3rd, 2009

Re: Simple Array Question

You could use the escape sequence "\n" after you print out the 4th element in the array? Or use just System.out.println(); after the 4th element has been printed.

Last edited by majestic0110; Oct 3rd, 2009 at 10:59 am.

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Oct 3rd, 2009

Re: Simple Array Question

The second option is better as "\n" is platform specific and is not always guaranteed to get the effect you wanted.

Last edited by masijade; Oct 3rd, 2009 at 11:05 am.

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Oct 3rd, 2009

Re: Simple Array Question

Click to Expand / Collapse Quote originally posted by masijade ...

... "\n" is platform specific and is not always guaranteed to get the effect you wanted.

Just in case this matters: you can use

Java Syntax (Toggle Plain Text)
System.getProperty("line.separator");
System.getProperty("line.separator");

to get the line separator string appropriate to the current platform.

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Oct 3rd, 2009

Re: Simple Array Question

Yes. In fact thats very common, using 1d array as a mimic of a 2d.

Java Syntax (Toggle Plain Text)
final int ROW = 5;
final int COL  = 5
 
char[] Letters = new char[ ROW * COL];
 
for(int i = 0; i < ROW * COL; i++)
    Letters[i] = (char)( 'A' + i );
 
for(int i = 0; i < ROW; i++)
{
   for(int j = 0; j < COL; j++)
   {
       System.out.print( Letters[j + i * ROW] + " " );
   }
}
final int ROW = 5;
final int COL  = 5

char[] Letters = new char[ ROW * COL];

for(int i = 0; i < ROW * COL; i++)
    Letters[i] = (char)( 'A' + i );

for(int i = 0; i < ROW; i++)
{
   for(int j = 0; j < COL; j++)
   {
       System.out.print( Letters[j + i * ROW] + " " );
   }
}

It hasn't been tested, but you should get the idea, if it doesn't work.

firstPerson

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Re: Simple Array Question

Click to Expand / Collapse Quote originally posted by firstPerson ...

Yes. In fact thats very common, using 1d array as a mimic of a 2d.
Java Syntax (Toggle Plain Text)
final int ROW = 5;
final int COL  = 5
 
char[] Letters = new char[ ROW * COL];
 
for(int i = 0; i < ROW * COL; i++)
    Letters[i] = (char)( 'A' + i );
 
for(int i = 0; i < ROW; i++)
{
   for(int j = 0; j < COL; j++)
   {
       System.out.print( Letters[j + i * ROW] + " " );
   }
}
final int ROW = 5; final int COL = 5 char[] Letters = new char[ ROW * COL]; for(int i = 0; i < ROW * COL; i++) Letters[i] = (char)( 'A' + i ); for(int i = 0; i < ROW; i++) { for(int j = 0; j < COL; j++) { System.out.print( Letters[j + i * ROW] + " " ); } }
It hasn't been tested, but you should get the idea, if it doesn't work.

In this there is restriction that the array dimension can't be prime (Not a big deal...HUH??)

for prime we can use following looping...

Java Syntax (Toggle Plain Text)
int j=0;
for(int i=0;i<arr.length;i++)
{
      while(j%4!=0)
      {
             System.out.print(arr[j++]+" ");
       }
       System.out.println(arr[j++]);
}
int j=0;
for(int i=0;i<arr.length;i++)
{
      while(j%4!=0)
      {
             System.out.print(arr[j++]+" ");
       }
       System.out.println(arr[j++]);
}

I hope this works well and maybe better (LOL

)
your signature is really good "firstPerson"

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Oct 3rd, 2009

Re: Simple Array Question

This was was not working for me.

Here is what I have so far. In stead of printing it out in one row how can i get it to print in both rows and colomns. For example:

A B C D
E F G H
I J K L
...

Thanks

Java Syntax (Toggle Plain Text)
public void randomChars()
	{
		 ArrayList<Integer> list = new ArrayList<Integer>();
         int i = new Random().nextInt(letters.length);
         for(; list.size() != letters.length; i = new Random().nextInt(letters.length)) {
            if(!list.contains(i)) {
               System.out.print(letters[i]+" ");
               list.add(i);
            }
         }
public void randomChars()
	{
		 ArrayList<Integer> list = new ArrayList<Integer>();
         int i = new Random().nextInt(letters.length);
         for(; list.size() != letters.length; i = new Random().nextInt(letters.length)) {
            if(!list.contains(i)) {
               System.out.print(letters[i]+" ");
               list.add(i);
            }
         }

Last edited by KimJack; Oct 3rd, 2009 at 6:48 pm.

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Re: Simple Array Question

Quote ...

In this there is restriction that the array dimension can't be prime

Why is that again?

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Re: Simple Array Question

Click to Expand / Collapse Quote originally posted by KimJack ...

This was was not working for me.

It works for me :

Java Syntax (Toggle Plain Text)
import java.*;
 
 
class Main
{
    static void Print(Object ob){
        System.out.print(ob);
    }
    static void Print() {
        System.out.println();
    }
    public static void main(String[] Arg)
    {
        final int ROW = 5;
        final int COL = 5;
 
        char[] fake2D = new char[ROW*COL];
 
        for(int i = 0; i < ROW*COL; i++)
            fake2D[i] = (char)('A' + i);
 
        for(int i = 0; i < ROW; i++)
        {
            for(int j = 0; j < COL; j++)
            {
                if(i > 0 && i % ROW == 0)
                    Print();
 
                Print(fake2D[j + i * ROW] + " ");
            }
 
            Print();
        }
 
    }
 
}
import java.*;


class Main
{
    static void Print(Object ob){
        System.out.print(ob);
    }
    static void Print() {
        System.out.println();
    }
    public static void main(String[] Arg)
    {
        final int ROW = 5;
        final int COL = 5;
        
        char[] fake2D = new char[ROW*COL];

        for(int i = 0; i < ROW*COL; i++)
            fake2D[i] = (char)('A' + i);

        for(int i = 0; i < ROW; i++)
        {
            for(int j = 0; j < COL; j++)
            {
                if(i > 0 && i % ROW == 0)
                    Print();

                Print(fake2D[j + i * ROW] + " ");
            }

            Print();
        }

    }

}

firstPerson

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Oct 3rd, 2009

Re: Simple Array Question

This is great, but how would I go about preventing duplicates when the array is randomized?

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