Bresenham circle drawing algorithm in c

#include<stdio.h>
#include <graphics.h>
#include <conio.h>
#include<math.h>
void main()
{
   int gdriver = DETECT, gmode;
   int p,x,y;
   int xc,yc,r;
   initgraph(&gdriver,&gmode,"c:/tc/bgi");

   printf("Enter the origin of circle(xc,yc)=");
   scanf("%d %d",&xc,&yc);
   printf("\nEnter the radius of the circle=");
   scanf("%d",&r);
   x=0;
   y=r;
   putpixel(xc+x,yc+y,1);
   putpixel(xc-x,yc+y,1);
   putpixel(xc+x,yc-y,1);
   putpixel(xc-x,yc-y,1);
   putpixel(xc+y,yc+x,1);
   putpixel(xc-y,yc+x,1);
   putpixel(xc+y,yc-x,1);
   putpixel(xc-y,yc-x,1);
   p=1-r;
   while(x<y)
   {
    if (p<0)
    x++;
    else
    {
        x++;
        y--;
    }
    if(p<0)
    p=p+2*x+1;
    else
    p=p+2*(x-y)+1;
   putpixel(xc+x,yc+y,1);
   putpixel(xc-x,yc+y,1);
   putpixel(xc+x,yc-y,1);
   putpixel(xc-x,yc-y,1);
   putpixel(xc+y,yc+x,1);
   putpixel(xc-y,yc+x,1);
   putpixel(xc+y,yc-x,1);
   putpixel(xc-y,yc-x,1);
 
   }
   getch();
}