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KimJack

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Simple Array Question

Oct 3rd, 2009

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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Re: Simple Array Question

Oct 3rd, 2009

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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Re: Simple Array Question

Oct 3rd, 2009

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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Re: Simple Array Question

Oct 3rd, 2009

•

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

 Help with Code Tags 
 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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firstPerson firstPerson is offline

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Re: Simple Array Question

Oct 3rd, 2009

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

 Help with Code Tags 
 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.

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Re: Simple Array Question

-1

Oct 3rd, 2009

•

Originally Posted by firstPerson

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

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...

 Help with Code Tags 
 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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"I M POSSIBLE":) :) :)

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KimJack

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Re: Simple Array Question

Oct 3rd, 2009

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

 Help with Code Tags 
 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

-1

Oct 3rd, 2009

•

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

Why is that again?

Help with Code Tags

(Toggle Plain Text)

1) What word becomes shorter if you add a letter to it? 
      [ Solved by : niek_e, Paul Thompson, SgtMe, murtan, xavier666, jonsca]
2) What does this sequence  equal to :  (.5u - .5a)(.5u-.5b)(.5u-.5c) ...
      [*solved by : murtan, xavier666]
3) What is the 123456789th prime numer?

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Re: Simple Array Question

-1

Oct 3rd, 2009

•

Originally Posted by KimJack

This was was not working for me.

It works for me :

 Help with Code Tags 
 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();
        }

    }

}

Help with Code Tags

(Toggle Plain Text)

1) What word becomes shorter if you add a letter to it? 
      [ Solved by : niek_e, Paul Thompson, SgtMe, murtan, xavier666, jonsca]
2) What does this sequence  equal to :  (.5u - .5a)(.5u-.5b)(.5u-.5c) ...
      [*solved by : murtan, xavier666]
3) What is the 123456789th prime numer?