CMIS 141

Nested loops and fun figures


Write a program that displays a rectangle of stars of user-specified
size.  User enters the number of rows and the number of columns
(i.e. height and width of the rectangle of stars).  Use a JTextArea
object in a JOptionPane to display the asterisks (don't use Graphics
drawing methods in paint method)


Say 5 4 is the height and width (number of rows and number of
columns), then the display will look like this:

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

Hint: outer loop for each row, inner loop for each column (of that row)

Modify it so that displays the row number is at the beginning and end of
each row, like this:
1****1
2****2
3****3
4****4
5****5

Further modify it so that displays the column number also at the top of
each column, like this:
 1234
1****1
2****2
3****3
4****4
5****5


Modify it so that it displays the outer perimeter only, i.e. make it
display a "box":

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

Hint: instead of putting an asterisk at every position, an asterisk is
put only on the borders (what test can determine if the current
position in the looping is a border?), a blank character every where else.


Modify it so that it also displays a diagonal line of stars
from upper left to lower right corners of the box (hint: these
positions are where the row number is the same as the column number).

*
 *
  *
   *
  

If you're done already, don't worry, I've got lots more fun figures to
draw.