Program to show getpixel() application

#include "graphics.h"

void main()
{
int driver = DETECT,mode;
int i;

initgraph(&driver,&mode,"c:\\borlandc\\bgi");
line(100,100,500,100);
for ( i = 20; i < 300; i++ )
if ( getpixel(300,i) == WHITE )
{
setcolor(BLUE);
circle(300,i,5);
}
else
putpixel(300,i,WHITE);
getch();
closegraph();
}