#include <graphics.h>
#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <dos.h>
void main()
{
  float x, y, x1, y1, x2, y2, dx, dy, step;
  int i, gd = DETECT, gm;
  initgraph(&gd, &gm, "c:\\turboc3\\bgi");
  printf("Enter the value of x1 and y1 : ");
  scanf("%f%f", &x1, &y1);
  printf("Enter the value of x2 and y2: ");
  scanf("%f%f", &x2, &y2);
  dx = abs(x2 - x1);
  dy = abs(y2 - y1);
  if (dx >= dy)
    step = dx;
  else
    step = dy;
  dx = dx / step;
  dy = dy / step;
  x = x1;
  y = y1;
  i = 1;
  while (i <= step)
  {
    putpixel(x, y, 5);
    x = x + dx;
    y = y + dy;
    i = i + 1;
    delay(100);
  }
  getch();
  closegraph();
}