/* Note:Your choice is C IDE */
#include <stdio.h>
#include <graphics.h>
main()
{
	int graphdriver,CGA;
	int graphmode,CGAC0,x;
	initgraph(&graphdriver,&graphmode,"");   
    cleardevice();
    for(x=20;x<=300;x+=16)
	{
    	putpixel(x,20,1);
    	putpixel(x+4,20,2);
	}
    getch();
 	closegraph();
 }