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Thread: Removing the middle cell

  1. #1
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    Default Removing the middle cell

    Hi guys, i have created a program that outputs and prints a rectangle when given the width and height as command line arguments. I've got it to add 1 row and column if the number of rows or columns is even, so that the rectangle as a middle cell. I want to take this cell out (i.e. replace with spaces).

    How would i get it to do this? Would i need to put in a loop or as an if statement.


    public class PrintHoledRectangle
    {
      public static void main(String [] args)
      {
        int width = Integer.parseInt(args[0]);
        int height = Integer.parseInt(args[1]);
        int count = width * height;
        int middleCell = ((width*height)/2)+ 1;
     
       if ((count % 2) == 0 && height == width)
        {
          width+=1;
          height+=1;
        }
        else if ((count % 2) == 0 && (width % 2) == 0 && (height % 2) !=0)
          width+=1;
        else if ((count % 2) == 0 && (height % 2) == 0 && (width % 2) !=0)
          height+=1;
        else if ((count % 2) == 0 && (height % 2) == 0 && (width % 2) == 0)
        {
          height+=1;
          width+=1;
        }
     
        for (int row = 1; row <= height; row++)
        {
          for (int column = 1; column <= width; column++)
            System.out.print("[_]");
     
     
          System.out.println();
        } // for
     
        for (int i = 1; i < middleCell; i++)
        {
          i = middleCell;
          System.out.print("   ");
     
        }
     
     
      } // main
    } // class PrintHoledRectangle
    Kind Regards

    Shyam

    I also tried an if statement inside the loop:

    for (int i=0;i<middleCell;i++)
    {
    if i==middleCell
    system.out.println(" ");

    didnt work though
    Last edited by copeg; November 7th, 2010 at 04:36 PM.


  2. #2
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    Default Re: Removing the middle cell

    Quote Originally Posted by Shyamz1 View Post
    Hi guys, i have created a program that outputs and prints a rectangle when given the width and height as command line arguments. I've got it to add 1 row and column if the number of rows or columns is even, so that the rectangle as a middle cell. I want to take this cell out (i.e. replace with spaces).

    How would i get it to do this? Would i need to put in a loop or as an if statement.


    public class PrintHoledRectangle
    {
      public static void main(String [] args)
      {
        int width = Integer.parseInt(args[0]);
        int height = Integer.parseInt(args[1]);
        int count = width * height;
        int middleCell = ((width*height)/2)+ 1;
     
       if ((count % 2) == 0 && height == width)
        {
          width+=1;
          height+=1;
        }
        else if ((count % 2) == 0 && (width % 2) == 0 && (height % 2) !=0)
          width+=1;
        else if ((count % 2) == 0 && (height % 2) == 0 && (width % 2) !=0)
          height+=1;
        else if ((count % 2) == 0 && (height % 2) == 0 && (width % 2) == 0)
        {
          height+=1;
          width+=1;
        }
     
        for (int row = 1; row <= height; row++)
        {
          for (int column = 1; column <= width; column++)
            System.out.print("[_]");
     
     
          System.out.println();
        } // for
     
        for (int i = 1; i < middleCell; i++)
        {
          i = middleCell;
          System.out.print("   ");
     
        }
     
     
      } // main
    } // class PrintHoledRectangle
    Kind Regards

    Shyam

    I also tried an if statement inside the loop:

    for (int i=0;i<middleCell;i++)
    {
      if i==middleCell
       system.out.println("  ");
    didnt work though
    Hmmmm....if you want to take it out, would the width and height be 1 less then?

    Do the width and height include spaces?

    If not, you should be decrementing it by 1, not incrementing it.

    You don't have a statement, probably an else would be best, to handle if count%2 !=0.

    Also, what does your output look like so far?

    Are you trying to make a grid of rectangles?

    Also, your for loop:

        for (int row = 1; row <= height; row++)
        {
          for (int column = 1; column <= width; column++)
            System.out.print("[_]");
     
     
          System.out.println();
        } // for

    will only print one rectangle per line.

    middle cell is an int. Are you trying to make it a rectangle?

  3. #3
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    Default Re: Removing the middle cell

    Ahhhh....I think I'm starting to see what's going on.

    The thing is, if you have an even number of rectangles, you're going to have 2 middle cells.

    That's why you're adding one to the number of rows and/or columns, to make it so there's only 1 middle cell.

    That will make it even again.

    A better way would be to make a 2D array
    // first make sure that you've already added the extra cell 
    String[][] array = new String[rows][columns];
     
    for (int rows = 0; rows < array.length; rows++)
    {
    for (int columns =0; columns < array[rows].length; columns++)
     
    array[rows][columns] ="[_]";
    }
     
    // not sure if you need a second pair of brackets after second for statement.  You'll have to check on that one.

    Say for 5 rows and 5 columns

    0 1 2 3 4
    0 1 2 3 4
    0 1 2 3 4
    0 1 2 3 4
    0 1 2 3 4

    for a count of n * m where n and m are both odd, set the

    ((n*m)/2) + 1 element to " ";

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