#include<stdio.h>
#include<conio.h>
#include<graphics.h>
#include<dos.h>
#include<math.h>

int main()
{
    double x1,y1,temp,x2,y2,dx,dy,x,y,m,b,xf;
    int gd=DETECT, gm, color, angle=0;
    initgraph(&gd, &gm,"C:\\TC\\BGI\\");
    printf("Please enter the value of x1,y1,x2,y2");
    scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2);
	if(y1>y2)
	{
		temp=y1;
		y1=y2;
		y2=temp;
	}
	x=x1;
	y=y1;
	dx=fabs(x1-x2);
	dy=fabs(y1-y2);
	m=dy/dx;
	b=y-(m*x1);
	circle(x,y,1);
	while(y<y2)
	{
		y++;
		xf=(y-b)/m;
		x=floor(xf+.5);
		circle(x,y,1);
		delay(200);
	}
	getch();
    closegraph();
    return 0;
}