Easy for Loop Problem

[iidavidii]

Hello all,

I have stumbled on a programming exercise and am in need of a little help.

Problem: Get an integer n from an input dialog, print out the following pattern on the console window.

For example, when n is 3, there are 5 (2 * n - 1 = 2 * 3 -1 = 5) rows in total:

example: http://david.vonetwork.net/pattern1.bmp

For another example, when n is 4 there are 7 (2 * n -1=2 * 4 -1 = 7) rows in total:


Example 2: http://david.vonetwork.net/pattern2.bmp

I know how to get n from an integer dialog box, but I am stuck in making the patterns. It is required that you use only nested for loops.

The Reward

I am unable to make this a paid project but I am offering 6 g-mail accounts for the correct solution

This should be a simple exercise for any experienced java programming. If you would like to help me out just post the solution either in this thread or in a pm.

Thanks for your help in advance,
Joe

PS. This post is going be posted on multiple forums, first one overall to get the correct solution gets the g0mail accounts. I will of course update you on the status

[JGRobinson]

Hi,

heres my little effort at it.

Cheers
Graham

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public class OutputPattern
{
    
    public static void main(String[] args)
    {
        OutputPattern op = new OutputPattern();
        try
        {
            op.doWork();
        }catch(java.io.IOException ioe)
        {
            System.out.println("Got Exception" + ioe);
        }
    }
    
    public void doWork() throws java.io.IOException
    {
        // Assume that this has be read in
        
        int NumberofIterations = Integer.parseInt(System.in.read()+"" ) - 48;
              
        
        for(int i = 1; i <= (2 *NumberofIterations - 1); i+=2)
        {
            // Print spacers
            
            for(int spacer=0; spacer < (NumberofIterations - (i/2)); spacer++)
            {
                System.out.print(" ");
            }

            // print stars
            
            for(int stars = 0; stars < i; stars++)
            {
                System.out.print("*");
            }
            System.out.println("");
        }

        // Now do it in reverse
        
        for(int i = (2 * NumberofIterations - 3); i >= 1; i-=2)
        {
            // Print spacers
            
            for(int spacer=0; spacer < (NumberofIterations - (i/2)); spacer++)
            {
                System.out.print(" ");
            }

            // print stars
            
            for(int stars = 0; stars < i; stars++)
            {
                System.out.print("*");
            }
            System.out.println("");
        }
    }
}