Draw a line using bresenham’s line drawing algorithm with all cases

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

void bres(int, int, int, int);

void main()

{

      int gdriver = DETECT, gmode, x1,x2,y1,y2;

      initgraph(&gdriver,&gmode,"c:\\tc\\bgi");

      cleardevice();

      printf("Enter the values for Starting point (X1,Y1) : ");

      scanf("%d %d",&x1,&y1);

      printf("Enter the values for Ending   point (X2,Y2) : ");

      scanf("%d %d",&x2,&y2);

      bres(x1,y1,x2,y2);

      getch();

      closegraph();

}

void bres(int xa, int ya, int xb, int yb)

{

      int dx = abs(xb-xa), dy = abs(yb-ya);

      int Ty = 2*dy, Tyx = 2*(dy-dx), p = 2*dy-dx;

      int x, y, xEnd;

      if(xa > xb)

      {

            x = xb;

            y = yb;

            xEnd = xa;

      }

      else

      {

            x = xa;

            y = ya;

            xEnd = xb;

      }

      putpixel(x,y,14);

      while(x < xEnd)

      {

            x++;

            delay(100);

            if(p < 0)

                  p += Ty;

            else

            {

                  y++;

                  p += Tyx;

            }

            putpixel(x,y,14);

      }

}