#include <stdlib.h>
#include <math.h>
#include <conio.h>
#include <graphics.h>
void main()
{
  struct point { int x,y; } p1, p2;
  int lon,sho,Drive, Mode;
  float i, t, x, y;

  printf("give me the 1st point --> "); scanf("%d %d",&p1.x,&p1.y);
  printf("give me the 2st point --> "); scanf("%d %d",&p2.x,&p2.y);
  Drive=DETECT; initgraph(&Drive, &Mode, ""); setcolor(14);

  line(p1.x,p1.y,p2.x,p2.y); getche(); clearviewport();

  for (t=0; t<=1; t+=0.005) {
    x=(1-t)*p1.x+t*p2.x; y=(1-t)*p1.y+t*p2.y;
    if ((x >= 0) && (x <= 639) && (y >= 0) && (y <= 479)) putpixel(x,y,6);
  }

  getche(); closegraph();
}