Thread: Drawing triangle by using for loops.

Hi all,

A few days ago I solved a problem in which I had create the figure shown below:

Screenshot4.PNGScreenshot4.PNG

import java.awt.Graphics;
import java.applet.Applet; 
 
public class driehoek extends Applet {
 
	public void paint(Graphics g) {
		int x, y; 
		for(y=0; y<10; y++)
			for(x=0; x<y; x++)
				g.drawRect(20*x, 20*y, 10, 10); 
	} 
}

However, because I have some difficulty understanding for loops and recursion I tried to create the figure shown below:

Screenshot5.png

and this is my code:

 
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
 
public class gekkeDriehoek extends Applet {
 
	public void paint(Graphics g) 
	{
		int x, y; 
 
		for(y=0; y<10; y++)
		{
			for(x = 9; x<y; x--)
			{
				g.drawRect(x*20, y*20, 10, 10); 
			}
		}
 
	}
}

This code, however, returns a blank screen.
Does any of you see what my error is?