#include

#include

#include

#include

#include

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

/* initialize graphics and local variables */

initgraph(&gdriver, &gmode, “C:\\tc\\bgi”);

cout<<"\n Enter X1,Y1,X2,Y2"; int x1,y1,x2,y2; cin>>x1>>y1>>x2>>y2;

int dx=x2-x1;

int dy=y2-y1;

int length;

if (dx>=dy)

length=dx;

else

length=dy;

dx=dx/length;

dy=dy/length;

int sx;

if (dx>=0)

sx=1;

else

sx=-1;

int sy;

if(dy>=0)

sy=1;

else

sy=-1;

float x=x1+0.5*(sx);

float y=y1+0.5*(sy);

int i=0;

while(i<=length)
{
putpixel(int(x),int(y),15);
x=x+dx;
y=y+dy;
i=i+1;
}
/* clean up */
getch();
closegraph();
return 0;
}
[/cpp]
**Output:**

nice easy and clean to understand example…