Writing a nested loop with a single for loop (generic) - java

Question

No one in my residence hall knows how to do this question on our CS homework. It says:

The nested loops

for(int i = 1; i <= height; i++)
{
   for(int j = 1; j <= width; j++)
   {
      System.out.print("*");
   }
   System.out.println();
}

displays a rectangle of a given width and height, such as

 ****
 ****
 ****

for a width of 4 and a height of 3. Write a single for loop that displays the same rectangle. Remember that 3 and 4 are only an example, and your code must be general and work for any width and height.

We have tried many things but each one ends in failure. Are we missing something obvious?

Brian Agnew · Accepted Answer · 2010-10-25 21:34:41Z

16

You should look at iterating over the total number of asterisks you need to display, and display an asterisk/newline as appropriate as you iterate through (think about how many asterisks make up a row - I don't want to give you the answer, however!)

answered Oct 25, 2010 at 21:34

Brian Agnew

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1 Comment

miki725 Over a year ago

I agree. Giving HW answers is bad. Just a little hint however: you can use % operator...

MSI · Accepted Answer · 2010-10-25 21:43:06Z

0

You can use multiple conditions inside for loop

edited Oct 25, 2010 at 21:43

answered Oct 25, 2010 at 21:37

MSI

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Comments

Eugene Kuleshov · Accepted Answer · 2010-10-25 21:45:08Z

0

int w = 0;
for(int i = 0; i < height * width; i++)
{
   System.out.print("*");
   if( ++w >= width ) {
      w = 0;
      System.out.println();
   }
}

answered Oct 25, 2010 at 21:45

Eugene Kuleshov

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Comments

M2tM · Accepted Answer · 2010-10-25 21:46:07Z

0

In a custom template language I wrote this is the solution:

{set|($height)(3) ($width)(4)}

{for|i|1 : $i <= ($height*$width) : $i++|
   *
   {if| !(($i) % $width)|
      <br/>
   }
}

I didn't want to give you the answer in Java, but it's such a simple problem that giving you advice IS solving it, so this is the best I could come up with.

answered Oct 25, 2010 at 21:46

M2tM

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Comments

Sawyer · Accepted Answer · 2011-12-18 13:29:45Z

0

    int width = 9 ;
    int height = 3;
    for (int row = 1, column = 1 ; row <= height && column <= width; column++) {
        System.out.print("*");
        if(column == width) {
            column = 0;
            System.out.println();
            row ++;
        }
    }

answered Dec 18, 2011 at 13:29

Sawyer

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Comments

nIcE cOw · Accepted Answer · 2011-12-18 14:06:08Z

0

for (int row = 0, column = 0; (row < height && column < width); column++)
{
  System.out.print("*");
  if (column == (width - 1))
  {
    column = -1;
    row++;
    System.out.println();
    continue;
  }
}

Hope this helps.

Regards

answered Dec 18, 2011 at 14:06

nIcE cOw

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